feat: add Mistral AI as first-class alternative provider

src/main/engine/OpenCodeManager.ts

@@ -33,6 +33,10 @@ const ZEN_ANTHROPIC_URL = 'https://opencode.ai/zen/v1/messages';
 const ZEN_OPENAI_URL = 'https://opencode.ai/zen/v1/chat/completions';
 const ZEN_MODELS_URL = 'https://opencode.ai/zen/v1/models';
 
+// Mistral API endpoints
+const MISTRAL_API_URL = 'https://api.mistral.ai/v1/chat/completions';
+const MISTRAL_MODELS_URL = 'https://api.mistral.ai/v1/models';
+
 // Known model display names: maps model IDs to polished names and serves as offline fallback
 const MODEL_DISPLAY_NAMES: Record<string, string> = {
   // Anthropic Claude
@@ -75,6 +79,12 @@ const MODEL_DISPLAY_NAMES: Record<string, string> = {
   'kimi-k2-thinking': 'Kimi K2 Thinking',
   'big-pickle': 'Big Pickle',
   'trinity-large-preview-free': 'Trinity Large Preview Free',
+  // Mistral AI
+  'mistral-large-latest': 'Mistral Large',
+  'mistral-medium-latest': 'Mistral Medium',
+  'mistral-small-latest': 'Mistral Small',
+  'devstral-small-latest': 'Devstral Small',
+  'devstral-large-latest': 'Devstral Large',
 };
 
 
@@ -82,10 +92,49 @@ const MODEL_DISPLAY_NAMES: Record<string, string> = {
 // Uppercase prefixes that should not be title-cased
 const UPPERCASE_PREFIXES = ['gpt', 'glm'];
 
+// Per-model context token budgets for truncation
+// OpenCode models default to 150,000; Mistral models have specific budgets
+const MODEL_CONTEXT_BUDGETS: Record<string, number> = {
+  'mistral-large-latest': 35_000,
+  'mistral-medium-latest': 35_000,
+  'mistral-small-latest': 120_000,
+  'devstral-small-latest': 120_000,
+  'devstral-large-latest': 240_000,
+};
+
+// Vision capabilities per model (APIs don't expose this)
+const MODEL_CAPABILITIES: Record<string, { vision: boolean }> = {
+  // Anthropic Claude — all vision-capable
+  'claude-opus-4-6': { vision: true },
+  'claude-opus-4-5': { vision: true },
+  'claude-opus-4-1': { vision: true },
+  'claude-sonnet-4-6': { vision: true },
+  'claude-sonnet-4-5': { vision: true },
+  'claude-sonnet-4': { vision: true },
+  'claude-haiku-4-5': { vision: true },
+  'claude-3-5-haiku': { vision: true },
+  // OpenAI GPT — most are vision-capable
+  'gpt-5': { vision: true },
+  'gpt-5.1': { vision: true },
+  'gpt-5.2': { vision: true },
+  'gpt-5-nano': { vision: true },
+  // Google Gemini — vision-capable
+  'gemini-3.1-pro': { vision: true },
+  'gemini-3-pro': { vision: true },
+  'gemini-3-flash': { vision: true },
+  // Mistral AI
+  'mistral-large-latest': { vision: true },
+  'mistral-medium-latest': { vision: true },
+  'mistral-small-latest': { vision: true },
+  'devstral-small-latest': { vision: false },
+  'devstral-large-latest': { vision: false },
+};
+
 export interface ModelInfo {
   id: string;
   name: string;
   provider: string;
+  vision?: boolean;
 }
 
 export interface SendMessageOptions {
@@ -171,6 +220,7 @@ export class OpenCodeManager {
   private postMediaEngine: PostMediaEngine;
   private getMainWindow: () => BrowserWindow | null;
   private apiKey: string = '';
+  private mistralApiKey: string = '';
   private abortControllers: Map<string, AbortController> = new Map();
   private cachedModels: ModelInfo[] | null = null;
   private cachedModelsAt: number = 0;
@@ -212,17 +262,38 @@ export class OpenCodeManager {
   }
 
   /**
-   * Check if the service is configured and ready
+   * Set API key for Mistral AI
    */
-  async checkReady(): Promise<{ ready: boolean; error?: string }> {
-    if (!this.apiKey) {
-      return { ready: false, error: 'API key not configured' };
-    }
-    return { ready: true };
+  setMistralApiKey(key: string): void {
+    this.mistralApiKey = key;
+    // Invalidate model cache so merged list is re-fetched
+    this.cachedModels = null;
+    this.cachedModelsAt = 0;
   }
 
   /**
-   * Validate an API key by calling the models endpoint
+   * Get current Mistral API key
+   */
+  getMistralApiKey(): string {
+    return this.mistralApiKey;
+  }
+
+  /**
+   * Check if the service is configured and ready
+   */
+  async checkReady(): Promise<{ ready: boolean; error?: string; providers?: { opencode: boolean; mistral: boolean } }> {
+    const providers = {
+      opencode: !!this.apiKey,
+      mistral: !!this.mistralApiKey,
+    };
+    if (!this.apiKey && !this.mistralApiKey) {
+      return { ready: false, error: 'API key not configured', providers };
+    }
+    return { ready: true, providers };
+  }
+
+  /**
+   * Validate an OpenCode API key by calling the models endpoint
    */
   async validateApiKey(apiKey: string): Promise<{ isValid: boolean; models: ModelInfo[] }> {
     if (!apiKey || apiKey.length < 3) {
@@ -242,7 +313,11 @@ export class OpenCodeManager {
           headers,
         });
         if (response.statusCode >= 200 && response.statusCode < 300) {
-          return { isValid: true, models: Object.entries(MODEL_DISPLAY_NAMES).map(([id, name]) => ({ id, name, provider: this.detectProvider(id) })) };
+          // Filter to only OpenCode models (not Mistral)
+          const models = Object.entries(MODEL_DISPLAY_NAMES)
+            .map(([id, name]) => ({ id, name, provider: this.detectProvider(id), vision: MODEL_CAPABILITIES[id]?.vision ?? false }))
+            .filter(m => this.isProviderKeySet(m.provider) || m.provider !== 'mistral');
+          return { isValid: true, models };
         }
       } catch {
         // Try next auth method
@@ -252,8 +327,42 @@ export class OpenCodeManager {
     return { isValid: false, models: [] };
   }
 
+  /**
+   * Validate a Mistral API key by calling the Mistral models endpoint
+   */
+  async validateMistralApiKey(apiKey: string): Promise<{ isValid: boolean; models: ModelInfo[] }> {
+    if (!apiKey || apiKey.length < 3) {
+      return { isValid: false, models: [] };
+    }
+
+    try {
+      const response = await this.httpRequest(MISTRAL_MODELS_URL, {
+        method: 'GET',
+        headers: {
+          'Authorization': `Bearer ${apiKey}`,
+        },
+      });
+
+      if (response.statusCode >= 200 && response.statusCode < 300) {
+        const data = JSON.parse(response.body);
+        if (data.data && Array.isArray(data.data) && data.data.length > 0) {
+          // Return Mistral models from display name map
+          const models = Object.entries(MODEL_DISPLAY_NAMES)
+            .filter(([id]) => this.detectProvider(id) === 'mistral')
+            .map(([id, name]) => ({ id, name, provider: 'mistral', vision: MODEL_CAPABILITIES[id]?.vision ?? false }));
+          return { isValid: true, models };
+        }
+      }
+    } catch {
+      // Fall through
+    }
+
+    return { isValid: false, models: [] };
+  }
+
   /**
    * Get available models (cached with 5-minute TTL)
+   * Merges models from all configured providers.
    */
   async getAvailableModels(): Promise<ModelInfo[]> {
     // Return cached models if within TTL
@@ -261,7 +370,10 @@ export class OpenCodeManager {
       return this.cachedModels;
     }
 
-    // Try fetching from API
+    const allModels: ModelInfo[] = [];
+    let fetched = false;
+
+    // Fetch OpenCode models
     if (this.apiKey) {
       try {
         const response = await this.httpRequest(ZEN_MODELS_URL, {
@@ -274,14 +386,15 @@ export class OpenCodeManager {
         if (response.statusCode === 200) {
           const data = JSON.parse(response.body);
           if (data.data && Array.isArray(data.data)) {
-            const models = data.data.map((m: { id: string }) => ({
-              id: m.id,
-              name: this.formatModelName(m.id),
-              provider: this.detectProvider(m.id),
-            }));
-            this.cachedModels = models;
-            this.cachedModelsAt = Date.now();
-            return models;
+            for (const m of data.data as Array<{ id: string }>) {
+              allModels.push({
+                id: m.id,
+                name: this.formatModelName(m.id),
+                provider: this.detectProvider(m.id),
+                vision: MODEL_CAPABILITIES[m.id]?.vision ?? false,
+              });
+            }
+            fetched = true;
           }
         }
       } catch {
@@ -289,12 +402,52 @@ export class OpenCodeManager {
       }
     }
 
-    // Build fallback from display name map
-    const fallback = Object.entries(MODEL_DISPLAY_NAMES).map(([id, name]) => ({
-      id,
-      name,
-      provider: this.detectProvider(id),
-    }));
+    // Fetch Mistral models
+    if (this.mistralApiKey) {
+      try {
+        const response = await this.httpRequest(MISTRAL_MODELS_URL, {
+          method: 'GET',
+          headers: {
+            'Authorization': `Bearer ${this.mistralApiKey}`,
+          },
+        });
+        if (response.statusCode === 200) {
+          const data = JSON.parse(response.body);
+          if (data.data && Array.isArray(data.data)) {
+            for (const m of data.data as Array<{ id: string }>) {
+              // Only include models we know about (have display names)
+              if (MODEL_DISPLAY_NAMES[m.id]) {
+                allModels.push({
+                  id: m.id,
+                  name: this.formatModelName(m.id),
+                  provider: 'mistral',
+                  vision: MODEL_CAPABILITIES[m.id]?.vision ?? false,
+                });
+              }
+            }
+            fetched = true;
+          }
+        }
+      } catch {
+        // Fall through to fallback
+      }
+    }
+
+    if (fetched && allModels.length > 0) {
+      this.cachedModels = allModels;
+      this.cachedModelsAt = Date.now();
+      return allModels;
+    }
+
+    // Build fallback from display name map, filtered by available provider keys
+    const fallback = Object.entries(MODEL_DISPLAY_NAMES)
+      .map(([id, name]) => ({
+        id,
+        name,
+        provider: this.detectProvider(id),
+        vision: MODEL_CAPABILITIES[id]?.vision ?? false,
+      }))
+      .filter(m => this.isProviderKeySet(m.provider));
     return fallback;
   }
 
@@ -335,6 +488,12 @@ export class OpenCodeManager {
       const modelId = conversation.model || 'claude-sonnet-4';
       const provider = this.detectProvider(modelId);
 
+      // Check that the provider's API key is available
+      if (!this.isProviderKeySet(provider)) {
+        const providerLabel = provider === 'mistral' ? 'Mistral' : 'OpenCode';
+        return { success: false, error: `The model '${modelId}' requires a ${providerLabel} API key. Configure it in Settings.` };
+      }
+
       // Get system prompt
       const systemMessage = conversation.messages.find(m => m.role === 'system');
       const basePrompt = systemMessage?.content || await this.chatEngine.getDefaultSystemPrompt();
@@ -387,6 +546,8 @@ export class OpenCodeManager {
           );
         }
 
+        // Get provider-specific config (URL, key, options)
+        const config = this.getProviderConfig(provider);
         return this.sendOpenAIMessage(
           modelId,
           prompt,
@@ -395,6 +556,9 @@ export class OpenCodeManager {
           { onDelta, onToolCall, onToolResult, onTokenUsage },
           conversationId,
           emitA2UIMessages,
+          config.apiUrl,
+          config.apiKey,
+          config.options,
         );
       };
 
@@ -735,7 +899,8 @@ export class OpenCodeManager {
   }
 
   /**
-   * Send via OpenAI-compatible API (non-Claude models)
+   * Send via OpenAI-compatible API (non-Claude models, including Mistral)
+   * Parameterized to support multiple providers with identical API format.
    */
   private async sendOpenAIMessage(
     modelId: string,
@@ -750,6 +915,9 @@ export class OpenCodeManager {
     },
     conversationId: string,
     emitA2UIMessages: (messages: A2UIServerMessage[]) => void,
+    apiUrl: string = ZEN_OPENAI_URL,
+    apiKey: string = this.apiKey,
+    providerOptions?: { parallelToolCalls?: boolean },
   ): Promise<{ content: string; toolCalls: Array<{ name: string; args: unknown }> }> {
     // Build OpenAI-format messages
     const allMessages: Array<Record<string, unknown>> = [
@@ -775,12 +943,13 @@ export class OpenCodeManager {
 
     // Truncate conversation history to fit within context window
     // Keep system message (index 0), truncate from oldest conversation messages
+    const contextBudget = MODEL_CONTEXT_BUDGETS[modelId] ?? 150000;
     const conversationMessages = allMessages.slice(1);
     const anthropicFmt = conversationMessages.map(m => ({
       role: m.role as 'user' | 'assistant',
       content: (m.content as string) || '',
     }));
-    const truncated = this.truncateToTokenBudget(anthropicFmt, systemPrompt, anthropicTools);
+    const truncated = this.truncateToTokenBudget(anthropicFmt, systemPrompt, anthropicTools, contextBudget);
     const messages: Array<Record<string, unknown>> = [
       allMessages[0],
       ...truncated.map(m => ({ role: m.role, content: m.content })),
@@ -804,14 +973,19 @@ export class OpenCodeManager {
         stream_options: { include_usage: true },
       };
 
+      // Set parallel_tool_calls based on provider options (Mistral needs false)
+      if (providerOptions?.parallelToolCalls === false) {
+        body.parallel_tool_calls = false;
+      }
+
       // Retry only the HTTP connection (429/502/503 are caught before any events are emitted).
       // Event processing is outside retry scope to prevent double-emission of onDelta on retry.
       const { events } = await withRetry(async () => {
-        return httpRequestStream(ZEN_OPENAI_URL, {
+        return httpRequestStream(apiUrl, {
           method: 'POST',
           headers: {
             'Content-Type': 'application/json',
-            'Authorization': `Bearer ${this.apiKey}`,
+            'Authorization': `Bearer ${apiKey}`,
           },
           body: JSON.stringify(body),
           signal,
@@ -970,11 +1144,39 @@ export class OpenCodeManager {
           callbacks.onToolResult({ name: toolName, result });
         }
 
-        messages.push({
-          role: 'tool',
-          content: JSON.stringify(result),
-          tool_call_id: toolCall.id,
-        });
+        // Check for image result that needs multimodal formatting (OpenAI image_url format)
+        if (result && typeof result === 'object' && (result as Record<string, unknown>).__isImageResult) {
+          const imageResult = result as {
+            __isImageResult: boolean;
+            success: boolean;
+            mediaType: string;
+            base64: string;
+            metadata: Record<string, unknown>;
+          };
+
+          messages.push({
+            role: 'tool',
+            content: [
+              {
+                type: 'image_url',
+                image_url: {
+                  url: `data:${imageResult.mediaType};base64,${imageResult.base64}`,
+                },
+              },
+              {
+                type: 'text',
+                text: JSON.stringify({ success: true, metadata: imageResult.metadata }),
+              },
+            ],
+            tool_call_id: toolCall.id,
+          });
+        } else {
+          messages.push({
+            role: 'tool',
+            content: JSON.stringify(result),
+            tool_call_id: toolCall.id,
+          });
+        }
       }
 
       if (signal.aborted) break;
@@ -1850,7 +2052,9 @@ export class OpenCodeManager {
   }
 
   /**
-   * Generate a title for a conversation
+   * Generate a title for a conversation.
+   * Uses the configured title model (fallback: claude-haiku-4-5) and routes
+   * the request to the correct provider API.
    */
   private async generateConversationTitle(
     conversationId: string,
@@ -1858,32 +2062,40 @@ export class OpenCodeManager {
     _assistantResponse: string
   ): Promise<void> {
     try {
-      const body = {
-        model: 'claude-haiku-4-5',
-        max_tokens: 20,
-        system: 'Generate an ultra-short title (2-3 words, max 25 characters) for this conversation. Focus ONLY on the topic. Ignore any capability disclaimers. Output ONLY the title text.',
-        messages: [
-          {
-            role: 'user',
-            content: `Topic: ${userMessage.substring(0, 100)}`,
+      // Read configured title model
+      const titleModel = await this.chatEngine.getSetting('chat_title_model') || 'claude-haiku-4-5';
+      const provider = this.detectProvider(titleModel);
+
+      // Ensure we have the key for this provider
+      if (!this.isProviderKeySet(provider)) return;
+
+      const promptText = `Topic: ${userMessage.substring(0, 100)}`;
+      const systemText = 'Generate an ultra-short title (2-3 words, max 25 characters) for this conversation. Focus ONLY on the topic. Ignore any capability disclaimers. Output ONLY the title text.';
+
+      let title = '';
+
+      if (provider === 'anthropic') {
+        const body = {
+          model: titleModel,
+          max_tokens: 20,
+          system: systemText,
+          messages: [{ role: 'user', content: promptText }],
+        };
+
+        const response = await this.httpRequest(ZEN_ANTHROPIC_URL, {
+          method: 'POST',
+          headers: {
+            'Content-Type': 'application/json',
+            'x-api-key': this.apiKey,
+            'Authorization': `Bearer ${this.apiKey}`,
+            'anthropic-version': '2023-06-01',
           },
-        ],
-      };
+          body: JSON.stringify(body),
+        });
 
-      const response = await this.httpRequest(ZEN_ANTHROPIC_URL, {
-        method: 'POST',
-        headers: {
-          'Content-Type': 'application/json',
-          'x-api-key': this.apiKey,
-          'Authorization': `Bearer ${this.apiKey}`,
-          'anthropic-version': '2023-06-01',
-        },
-        body: JSON.stringify(body),
-      });
+        if (response.statusCode !== 200) return;
 
-      if (response.statusCode === 200) {
         const data = JSON.parse(response.body);
-        let title = '';
         if (Array.isArray(data.content)) {
           title = data.content
             .filter((b: AnthropicContentBlock) => b.type === 'text')
@@ -1892,23 +2104,47 @@ export class OpenCodeManager {
         } else {
           title = data.content || '';
         }
+      } else {
+        // OpenAI-compatible (includes Mistral)
+        const config = this.getProviderConfig(provider);
+        const body = {
+          model: titleModel,
+          max_tokens: 20,
+          messages: [
+            { role: 'system', content: systemText },
+            { role: 'user', content: promptText },
+          ],
+        };
 
-        // Clean up and truncate title
-        title = title.trim().replace(/^["']|["']$/g, '').replace(/[.!?]+$/, '');
+        const response = await this.httpRequest(config.apiUrl, {
+          method: 'POST',
+          headers: {
+            'Content-Type': 'application/json',
+            'Authorization': `Bearer ${config.apiKey}`,
+          },
+          body: JSON.stringify(body),
+        });
 
-        // Hard limit on title length
-        const MAX_TITLE_LENGTH = 30;
-        if (title.length > MAX_TITLE_LENGTH) {
-          title = title.substring(0, MAX_TITLE_LENGTH - 1) + '…';
-        }
+        if (response.statusCode !== 200) return;
 
-        if (title) {
-          await this.chatEngine.updateConversation(conversationId, { title });
+        const data = JSON.parse(response.body);
+        title = data.choices?.[0]?.message?.content || '';
+      }
 
-          const mainWindow = this.getMainWindow();
-          if (mainWindow) {
-            mainWindow.webContents.send('chat-title-updated', { conversationId, title });
-          }
+      // Clean up and truncate title
+      title = title.trim().replace(/^["']|["']$/g, '').replace(/[.!?]+$/, '');
+
+      const MAX_TITLE_LENGTH = 30;
+      if (title.length > MAX_TITLE_LENGTH) {
+        title = title.substring(0, MAX_TITLE_LENGTH - 1) + '…';
+      }
+
+      if (title) {
+        await this.chatEngine.updateConversation(conversationId, { title });
+
+        const mainWindow = this.getMainWindow();
+        if (mainWindow) {
+          mainWindow.webContents.send('chat-title-updated', { conversationId, title });
         }
       }
     } catch (error) {
@@ -1996,11 +2232,32 @@ NOTE: Use pagination (offset/limit) in list_posts and search_posts to access all
     return this.modelCatalogEngine;
   }
 
+  /**
+   * Check whether the given provider's API key is configured.
+   * All non-mistral providers are routed through OpenCode Zen and share apiKey.
+   */
+  private isProviderKeySet(provider: string): boolean {
+    if (provider === 'mistral') return !!this.mistralApiKey;
+    return !!this.apiKey;
+  }
+
+  /**
+   * Return API URL, key and provider-specific options for a given provider.
+   * Used to parameterise sendOpenAIMessage() for non-Anthropic providers.
+   */
+  private getProviderConfig(provider: string): { apiUrl: string; apiKey: string; options?: { parallelToolCalls?: boolean } } {
+    if (provider === 'mistral') {
+      return { apiUrl: MISTRAL_API_URL, apiKey: this.mistralApiKey, options: { parallelToolCalls: false } };
+    }
+    return { apiUrl: ZEN_OPENAI_URL, apiKey: this.apiKey };
+  }
+
   private detectProvider(modelId: string): string {
     const id = modelId.toLowerCase();
     if (id.startsWith('claude')) return 'anthropic';
     if (id.startsWith('gpt') || id.startsWith('o3') || id.startsWith('o4')) return 'openai';
     if (id.startsWith('gemini')) return 'google';
+    if (id.startsWith('mistral') || id.startsWith('ministral') || id.startsWith('devstral') || id.startsWith('codestral') || id.startsWith('pixtral')) return 'mistral';
     return 'other';
   }
 
@@ -2053,11 +2310,11 @@ NOTE: Use pagination (offset/limit) in list_posts and search_posts to access all
     tagMappings?: Record<string, string>;
     error?: string;
   }> {
-    if (!this.apiKey) {
-      return { success: false, error: 'API key not set' };
-    }
-
     const provider = this.detectProvider(modelId);
+    if (!this.isProviderKeySet(provider)) {
+      const providerLabel = provider === 'mistral' ? 'Mistral' : 'OpenCode';
+      return { success: false, error: `${providerLabel} API key not set` };
+    }
     
     // Build the prompt for taxonomy analysis
     const existingCategories = categories.filter(c => c.existsInProject).map(c => c.name);
@@ -2148,7 +2405,8 @@ Remember: Only suggest mappings from NEW items to EXISTING items. Consider langu
           }
         }
       } else {
-        // OpenAI-compatible
+        // OpenAI-compatible (includes Mistral)
+        const config = this.getProviderConfig(provider);
         const body = {
           model: modelId,
           max_tokens: 4096,
@@ -2158,11 +2416,11 @@ Remember: Only suggest mappings from NEW items to EXISTING items. Consider langu
           ],
         };
 
-        const response = await this.httpRequest(ZEN_OPENAI_URL, {
+        const response = await this.httpRequest(config.apiUrl, {
           method: 'POST',
           headers: {
             'Content-Type': 'application/json',
-            Authorization: `Bearer ${this.apiKey}`,
+            Authorization: `Bearer ${config.apiKey}`,
           },
           body: JSON.stringify(body),
         });
@@ -2224,7 +2482,8 @@ Remember: Only suggest mappings from NEW items to EXISTING items. Consider langu
 
   /**
    * Analyze a media image and generate title, alt text, and caption using AI
-   * This is a one-shot request that looks at the image and suggests metadata
+   * This is a one-shot request that looks at the image and suggests metadata.
+   * Uses the configured image analysis model and routes to the correct provider.
    */
   async analyzeMediaImage(mediaId: string, language: string = 'en'): Promise<{
     success: boolean;
@@ -2233,8 +2492,13 @@ Remember: Only suggest mappings from NEW items to EXISTING items. Consider langu
     caption?: string;
     error?: string;
   }> {
-    if (!this.apiKey) {
-      return { success: false, error: 'API key not configured. Please set your OpenCode API key in Settings.' };
+    // Read configured image analysis model (default: claude-sonnet-4-5)
+    const modelId = await this.chatEngine.getSetting('chat_image_analysis_model') || 'claude-sonnet-4-5';
+    const provider = this.detectProvider(modelId);
+
+    if (!this.isProviderKeySet(provider)) {
+      const providerLabel = provider === 'mistral' ? 'Mistral' : 'OpenCode';
+      return { success: false, error: `API key not configured. Please set your ${providerLabel} API key in Settings.` };
     }
 
     // Get media metadata
@@ -2278,59 +2542,100 @@ CAPTION: Short, engaging blog caption (5-20 words).
 Respond with JSON only: {"title": "...", "alt": "...", "caption": "..."}`;
 
     try {
-      // Using Claude Sonnet 4.5 for best image analysis
-      const modelId = 'claude-sonnet-4-5';
-      
-      const body = {
-        model: modelId,
-        max_tokens: 200,
-        system: systemPrompt,
-        messages: [
-          {
-            role: 'user',
-            content: [
-              {
-                type: 'image',
-                source: {
-                  type: 'base64',
-                  media_type: 'image/webp',
-                  data: base64Data,
-                },
-              },
-              {
-                type: 'text',
-                text: 'Analyze and respond with JSON.',
-              },
-            ],
-          },
-        ],
-      };
-
-      const response = await this.httpRequest(ZEN_ANTHROPIC_URL, {
-        method: 'POST',
-        headers: {
-          'Content-Type': 'application/json',
-          'x-api-key': this.apiKey,
-          'Authorization': `Bearer ${this.apiKey}`,
-          'anthropic-version': '2023-06-01',
-        },
-        body: JSON.stringify(body),
-      });
-
-      if (response.statusCode !== 200) {
-        console.error('[OpenCodeManager] Image analysis failed:', response.body);
-        const errorMsg = this.parseErrorResponse(response);
-        return { success: false, error: errorMsg };
-      }
-
-      const data = JSON.parse(response.body);
-      
-      // Extract text from Anthropic response
       let responseText = '';
-      for (const block of data.content || []) {
-        if (block.type === 'text') {
-          responseText += block.text;
+
+      if (provider === 'anthropic') {
+        const body = {
+          model: modelId,
+          max_tokens: 200,
+          system: systemPrompt,
+          messages: [
+            {
+              role: 'user',
+              content: [
+                {
+                  type: 'image',
+                  source: {
+                    type: 'base64',
+                    media_type: 'image/webp',
+                    data: base64Data,
+                  },
+                },
+                {
+                  type: 'text',
+                  text: 'Analyze and respond with JSON.',
+                },
+              ],
+            },
+          ],
+        };
+
+        const response = await this.httpRequest(ZEN_ANTHROPIC_URL, {
+          method: 'POST',
+          headers: {
+            'Content-Type': 'application/json',
+            'x-api-key': this.apiKey,
+            'Authorization': `Bearer ${this.apiKey}`,
+            'anthropic-version': '2023-06-01',
+          },
+          body: JSON.stringify(body),
+        });
+
+        if (response.statusCode !== 200) {
+          console.error('[OpenCodeManager] Image analysis failed:', response.body);
+          const errorMsg = this.parseErrorResponse(response);
+          return { success: false, error: errorMsg };
         }
+
+        const data = JSON.parse(response.body);
+        for (const block of data.content || []) {
+          if (block.type === 'text') {
+            responseText += block.text;
+          }
+        }
+      } else {
+        // OpenAI-compatible (includes Mistral)
+        const config = this.getProviderConfig(provider);
+        const body = {
+          model: modelId,
+          max_tokens: 200,
+          messages: [
+            { role: 'system', content: systemPrompt },
+            {
+              role: 'user',
+              content: [
+                {
+                  type: 'image_url',
+                  image_url: {
+                    url: `data:image/webp;base64,${base64Data}`,
+                  },
+                },
+                {
+                  type: 'text',
+                  text: 'Analyze and respond with JSON.',
+                },
+              ],
+            },
+          ],
+        };
+
+        const response = await this.httpRequest(config.apiUrl, {
+          method: 'POST',
+          headers: {
+            'Content-Type': 'application/json',
+            'Authorization': `Bearer ${config.apiKey}`,
+          },
+          body: JSON.stringify(body),
+        });
+
+        if (response.statusCode !== 200) {
+          console.error('[OpenCodeManager] Image analysis failed:', response.body);
+          const errorMsg = this.parseErrorResponse(response);
+          return { success: false, error: errorMsg };
+        }
+
+        const data = JSON.parse(response.body);
+        responseText = data.choices?.[0]?.message?.content || '';
       }
 
       // Parse the JSON response

src/main/ipc/chatHandlers.ts

@@ -78,6 +78,16 @@ async function getOpenCodeManager(): Promise<OpenCodeManager> {
       } catch {
         // Silently ignore errors loading the key
       }
+
+      // Load Mistral API key from encrypted storage
+      try {
+        const mistralKey = await keyStore.retrieve('mistral_api_key');
+        if (mistralKey) {
+          openCodeManager!.setMistralApiKey(mistralKey);
+        }
+      } catch {
+        // Silently ignore errors loading the Mistral key
+      }
     })();
   }
 
@@ -104,6 +114,7 @@ export function registerChatHandlers(): void {
         ready: result.ready,
         error: result.error,
         backend: 'opencode',
+        providers: result.providers,
       };
     } catch (error) {
       console.error('[Chat IPC] Error checking ready:', error);
@@ -160,6 +171,106 @@ export function registerChatHandlers(): void {
     }
   });
 
+  // ============ Mistral API Key ============
+
+  // Validate Mistral API key
+  ipcMain.handle('chat:validateMistralApiKey', async (_, apiKey: string) => {
+    try {
+      const manager = await getOpenCodeManager();
+      const result = await manager.validateMistralApiKey(apiKey);
+      return result;
+    } catch (error) {
+      console.error('[Chat IPC] Error validating Mistral API key:', error);
+      return { isValid: false, models: [] };
+    }
+  });
+
+  // Set Mistral API key
+  ipcMain.handle('chat:setMistralApiKey', async (_, apiKey: string) => {
+    try {
+      const manager = await getOpenCodeManager();
+      const previousKey = manager.getMistralApiKey();
+      manager.setMistralApiKey(apiKey);
+
+      // Persist to encrypted storage — roll back in-memory key on failure
+      try {
+        await getSecureKeyStore().store('mistral_api_key', apiKey);
+      } catch (storeError) {
+        manager.setMistralApiKey(previousKey);
+        throw storeError;
+      }
+
+      return { success: true };
+    } catch (error) {
+      console.error('[Chat IPC] Error setting Mistral API key:', error);
+      return { success: false, error: (error as Error).message };
+    }
+  });
+
+  // Get Mistral API key (masked)
+  ipcMain.handle('chat:getMistralApiKey', async () => {
+    try {
+      const manager = await getOpenCodeManager();
+      const key = manager.getMistralApiKey();
+      if (!key) return { hasKey: false, maskedKey: '' };
+      const masked = '•'.repeat(Math.max(0, key.length - 4)) + key.slice(-4);
+      return { hasKey: true, maskedKey: masked };
+    } catch (error) {
+      console.error('[Chat IPC] Error getting Mistral API key:', error);
+      return { hasKey: false, maskedKey: '' };
+    }
+  });
+
+  // ============ Per-Purpose Model Preferences ============
+
+  // Get title generation model
+  ipcMain.handle('chat:getTitleModel', async () => {
+    try {
+      const engine = getChatEngine();
+      const model = await engine.getSetting('chat_title_model');
+      return { success: true, modelId: model || 'claude-haiku-4-5' };
+    } catch (error) {
+      console.error('[Chat IPC] Error getting title model:', error);
+      return { success: false, modelId: 'claude-haiku-4-5' };
+    }
+  });
+
+  // Set title generation model
+  ipcMain.handle('chat:setTitleModel', async (_, modelId: string) => {
+    try {
+      const engine = getChatEngine();
+      await engine.setSetting('chat_title_model', modelId);
+      return { success: true };
+    } catch (error) {
+      console.error('[Chat IPC] Error setting title model:', error);
+      return { success: false, error: (error as Error).message };
+    }
+  });
+
+  // Get image analysis model
+  ipcMain.handle('chat:getImageAnalysisModel', async () => {
+    try {
+      const engine = getChatEngine();
+      const model = await engine.getSetting('chat_image_analysis_model');
+      return { success: true, modelId: model || 'claude-sonnet-4-5' };
+    } catch (error) {
+      console.error('[Chat IPC] Error getting image analysis model:', error);
+      return { success: false, modelId: 'claude-sonnet-4-5' };
+    }
+  });
+
+  // Set image analysis model
+  ipcMain.handle('chat:setImageAnalysisModel', async (_, modelId: string) => {
+    try {
+      const engine = getChatEngine();
+      await engine.setSetting('chat_image_analysis_model', modelId);
+      return { success: true };
+    } catch (error) {
+      console.error('[Chat IPC] Error setting image analysis model:', error);
+      return { success: false, error: (error as Error).message };
+    }
+  });
+
   // ============ Chat Settings ============
 
   // Get available models

src/main/preload.ts

@@ -309,6 +309,17 @@ export const electronAPI: ElectronAPI = {
     setApiKey: (apiKey: string) => ipcRenderer.invoke('chat:setApiKey', apiKey),
     getApiKey: () => ipcRenderer.invoke('chat:getApiKey'),
 
+    // Mistral API Key Management
+    validateMistralApiKey: (apiKey: string) => ipcRenderer.invoke('chat:validateMistralApiKey', apiKey),
+    setMistralApiKey: (apiKey: string) => ipcRenderer.invoke('chat:setMistralApiKey', apiKey),
+    getMistralApiKey: () => ipcRenderer.invoke('chat:getMistralApiKey'),
+
+    // Per-Purpose Model Preferences
+    getTitleModel: () => ipcRenderer.invoke('chat:getTitleModel'),
+    setTitleModel: (modelId: string | null) => ipcRenderer.invoke('chat:setTitleModel', modelId),
+    getImageAnalysisModel: () => ipcRenderer.invoke('chat:getImageAnalysisModel'),
+    setImageAnalysisModel: (modelId: string | null) => ipcRenderer.invoke('chat:setImageAnalysisModel', modelId),
+
     // Settings
     getAvailableModels: () => ipcRenderer.invoke('chat:getAvailableModels'),
     setDefaultModel: (modelId: string) => ipcRenderer.invoke('chat:setDefaultModel', modelId),

src/main/shared/electronApi.ts

@@ -422,6 +422,7 @@ export interface ChatModel {
   id: string;
   name: string;
   provider?: string;
+  vision?: boolean;
 }
 
 export interface ModelCatalogEntry {
@@ -450,6 +451,7 @@ export interface ChatReadyStatus {
   ready: boolean;
   error?: string;
   backend?: string;
+  providers?: { opencode: boolean; mistral: boolean };
 }
 
 export interface ChatApiKeyStatus {
@@ -825,12 +827,23 @@ export interface ElectronAPI {
     setApiKey: (apiKey: string) => Promise<{ success: boolean; error?: string }>;
     getApiKey: () => Promise<ChatApiKeyStatus>;
 
+    // Mistral API Key
+    validateMistralApiKey: (apiKey: string) => Promise<{ isValid: boolean; models: ChatModel[] }>;
+    setMistralApiKey: (apiKey: string) => Promise<{ success: boolean; error?: string }>;
+    getMistralApiKey: () => Promise<ChatApiKeyStatus>;
+
     // Settings
     getAvailableModels: () => Promise<{ success: boolean; models?: ChatModel[]; selectedModel?: string; error?: string }>;
     setDefaultModel: (modelId: string) => Promise<{ success: boolean; error?: string }>;
     getSystemPrompt: () => Promise<{ success: boolean; prompt?: string; error?: string }>;
     setSystemPrompt: (prompt: string) => Promise<{ success: boolean; error?: string }>;
 
+    // Per-purpose model preferences
+    getTitleModel: () => Promise<{ success: boolean; modelId?: string | null; error?: string }>;
+    setTitleModel: (modelId: string | null) => Promise<{ success: boolean; error?: string }>;
+    getImageAnalysisModel: () => Promise<{ success: boolean; modelId?: string | null; error?: string }>;
+    setImageAnalysisModel: (modelId: string | null) => Promise<{ success: boolean; error?: string }>;
+
     // Model Catalog
     refreshModelCatalog: () => Promise<ModelCatalogRefreshResult>;
     getModelCatalog: () => Promise<{ success: boolean; entries: ModelCatalogEntry[]; error?: string }>;

src/renderer/components/ChatPanel/ChatPanel.css

@@ -85,6 +85,21 @@
   color: var(--vscode-list-activeSelectionForeground);
 }
 
+.model-group-header {
+  padding: 6px 12px 4px;
+  font-size: 10px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+  color: var(--vscode-descriptionForeground);
+  pointer-events: none;
+  border-top: 1px solid var(--vscode-dropdown-border);
+}
+
+.model-group-header:first-child {
+  border-top: none;
+}
+
 .chat-messages {
   flex: 1;
   overflow-y: auto;

src/renderer/components/ChatPanel/ChatPanel.tsx

@@ -355,15 +355,31 @@ export const ChatPanel: React.FC<ChatPanelProps> = ({ conversationId }) => {
             </button>
             {showModelSelector && (
               <div className="model-dropdown">
-                {availableModels.map(model => (
-                  <button
-                    key={model.id}
-                    className={`model-option ${conversation?.model === model.id ? 'active' : ''}`}
-                    onClick={() => handleModelChange(model.id)}
-                  >
-                    {model.name}
-                  </button>
-                ))}
+                {(() => {
+                  // Group models by provider for visual separation
+                  const groups: Record<string, ChatModel[]> = {};
+                  for (const model of availableModels) {
+                    const p = model.provider || 'other';
+                    if (!groups[p]) groups[p] = [];
+                    groups[p].push(model);
+                  }
+                  return Object.entries(groups).map(([provider, models]) => (
+                    <React.Fragment key={provider}>
+                      {Object.keys(groups).length > 1 && (
+                        <div className="model-group-header">{provider === 'mistral' ? 'Mistral' : 'OpenCode'}</div>
+                      )}
+                      {models.map(model => (
+                        <button
+                          key={model.id}
+                          className={`model-option ${conversation?.model === model.id ? 'active' : ''}`}
+                          onClick={() => handleModelChange(model.id)}
+                        >
+                          {model.name}
+                        </button>
+                      ))}
+                    </React.Fragment>
+                  ));
+                })()}
               </div>
             )}
           </div>

src/renderer/components/ImportAnalysisView/ImportAnalysisView.tsx

@@ -1371,15 +1371,30 @@ const TaxonomySection: React.FC<{
               </button>
               {showModelSelector && (
                 <div className="taxonomy-model-dropdown">
-                  {availableModels.map(model => (
-                    <button
-                      key={model.id}
-                      className="taxonomy-model-option"
-                      onClick={() => handleAnalyze(model.id)}
-                    >
-                      {model.name}
-                    </button>
-                  ))}
+                  {(() => {
+                    const groups: Record<string, ChatModel[]> = {};
+                    for (const model of availableModels) {
+                      const p = model.provider || 'other';
+                      if (!groups[p]) groups[p] = [];
+                      groups[p].push(model);
+                    }
+                    return Object.entries(groups).map(([provider, models]) => (
+                      <React.Fragment key={provider}>
+                        {Object.keys(groups).length > 1 && (
+                          <div className="model-group-header">{provider === 'mistral' ? 'Mistral' : 'OpenCode'}</div>
+                        )}
+                        {models.map(model => (
+                          <button
+                            key={model.id}
+                            className="taxonomy-model-option"
+                            onClick={() => handleAnalyze(model.id)}
+                          >
+                            {model.name}
+                          </button>
+                        ))}
+                      </React.Fragment>
+                    ));
+                  })()}
                 </div>
               )}
             </div>

src/renderer/components/SettingsView/SettingsView.tsx

@@ -1,4 +1,4 @@
-import React, { useState, useEffect, useRef, useCallback } from 'react';
+import React, { useState, useEffect, useRef, useCallback, useMemo } from 'react';
 import { useAppStore } from '../../store';
 import { showToast } from '../Toast';
 import { useI18n } from '../../i18n';
@@ -242,7 +242,12 @@ export const SettingsView: React.FC = () => {
   const [aiApiKeyMasked, setAiApiKeyMasked] = useState('');
   const [aiHasApiKey, setAiHasApiKey] = useState(false);
   const [newApiKey, setNewApiKey] = useState('');
-  const [availableModels, setAvailableModels] = useState<{id: string; name: string}[]>([]);
+  const [aiHasMistralKey, setAiHasMistralKey] = useState(false);
+  const [aiMistralKeyMasked, setAiMistralKeyMasked] = useState('');
+  const [newMistralKey, setNewMistralKey] = useState('');
+  const [titleModel, setTitleModel] = useState('claude-haiku-4-5');
+  const [imageAnalysisModel, setImageAnalysisModel] = useState('claude-sonnet-4-5');
+  const [availableModels, setAvailableModels] = useState<{id: string; name: string; provider?: string; vision?: boolean}[]>([]);
   const [selectedModel, setSelectedModel] = useState('');
   const [modelCatalog, setModelCatalog] = useState<Map<string, {
     maxOutputTokens: number | null;
@@ -403,6 +408,23 @@ export const SettingsView: React.FC = () => {
             setSelectedModel(modelsResult.selectedModel || '');
           }
 
+          // Load Mistral API key status
+          const mistralKeyResult = await window.electronAPI?.chat.getMistralApiKey();
+          if (mistralKeyResult) {
+            setAiHasMistralKey(mistralKeyResult.hasKey);
+            setAiMistralKeyMasked(mistralKeyResult.maskedKey || '');
+          }
+
+          // Load per-purpose model preferences
+          const titleModelResult = await window.electronAPI?.chat.getTitleModel();
+          if (titleModelResult?.success && titleModelResult.modelId) {
+            setTitleModel(titleModelResult.modelId);
+          }
+          const imageModelResult = await window.electronAPI?.chat.getImageAnalysisModel();
+          if (imageModelResult?.success && imageModelResult.modelId) {
+            setImageAnalysisModel(imageModelResult.modelId);
+          }
+
           // Load model catalog metadata
           const catalogResult = await window.electronAPI?.chat.getModelCatalog();
           if (catalogResult?.success && catalogResult.entries) {
@@ -1080,6 +1102,13 @@ export const SettingsView: React.FC = () => {
         setAiApiKeyMasked('•'.repeat(Math.max(0, newApiKey.length - 4)) + newApiKey.slice(-4));
         setNewApiKey('');
         showToast.success(t('settings.toast.apiKeySaved'));
+
+        // Refresh models after key change
+        const modelsResult = await window.electronAPI?.chat.getAvailableModels();
+        if (modelsResult?.success && modelsResult.models) {
+          setAvailableModels(modelsResult.models);
+          setSelectedModel(modelsResult.selectedModel || '');
+        }
       } else {
         showToast.error(t('settings.toast.apiKeyInvalid'));
       }
@@ -1089,6 +1118,54 @@ export const SettingsView: React.FC = () => {
     }
   };
 
+  const handleSaveMistralApiKey = async () => {
+    if (!newMistralKey.trim()) return;
+    try {
+      const validateResult = await window.electronAPI?.chat.validateMistralApiKey(newMistralKey.trim());
+      if (validateResult?.isValid) {
+        await window.electronAPI?.chat.setMistralApiKey(newMistralKey.trim());
+        setAiHasMistralKey(true);
+        setAiMistralKeyMasked('•'.repeat(Math.max(0, newMistralKey.length - 4)) + newMistralKey.slice(-4));
+        setNewMistralKey('');
+        showToast.success(t('settings.toast.apiKeySaved'));
+
+        // Refresh models after key change
+        const modelsResult = await window.electronAPI?.chat.getAvailableModels();
+        if (modelsResult?.success && modelsResult.models) {
+          setAvailableModels(modelsResult.models);
+          setSelectedModel(modelsResult.selectedModel || '');
+        }
+      } else {
+        showToast.error(t('settings.toast.apiKeyInvalid'));
+      }
+    } catch (error) {
+      console.error('Failed to save Mistral API key:', error);
+      showToast.error(t('settings.toast.apiKeySaveFailed'));
+    }
+  };
+
+  const handleTitleModelChange = async (modelId: string) => {
+    try {
+      const result = await window.electronAPI?.chat.setTitleModel(modelId);
+      if (result?.success) {
+        setTitleModel(modelId);
+      }
+    } catch (error) {
+      console.error('Failed to set title model:', error);
+    }
+  };
+
+  const handleImageAnalysisModelChange = async (modelId: string) => {
+    try {
+      const result = await window.electronAPI?.chat.setImageAnalysisModel(modelId);
+      if (result?.success) {
+        setImageAnalysisModel(modelId);
+      }
+    } catch (error) {
+      console.error('Failed to set image analysis model:', error);
+    }
+  };
+
   const handleModelChange = async (modelId: string) => {
     try {
       const result = await window.electronAPI?.chat.setDefaultModel(modelId);
@@ -1137,6 +1214,37 @@ export const SettingsView: React.FC = () => {
     }
   };
 
+  // Group models by provider for optgroup display
+  const groupedModels = useMemo(() => {
+    const groups: Record<string, typeof availableModels> = {};
+    for (const model of availableModels) {
+      const provider = model.provider || 'other';
+      if (!groups[provider]) groups[provider] = [];
+      groups[provider].push(model);
+    }
+    return groups;
+  }, [availableModels]);
+
+  const providerLabel = (provider: string) => {
+    if (provider === 'anthropic' || provider === 'openai' || provider === 'google' || provider === 'other') return t('settings.ai.providerOpenCode');
+    if (provider === 'mistral') return t('settings.ai.providerMistral');
+    return provider;
+  };
+
+  // Render a model <select> with optgroup by provider
+  const renderModelSelect = (id: string, value: string, onChange: (v: string) => void, disabled?: boolean) => (
+    <select id={id} value={value} onChange={(e) => onChange(e.target.value)} disabled={disabled}>
+      {availableModels.length === 0 && <option value="">{t('settings.ai.noModels')}</option>}
+      {Object.entries(groupedModels).map(([provider, models]) => (
+        <optgroup key={provider} label={providerLabel(provider)}>
+          {models.map(model => (
+            <option key={model.id} value={model.id}>{model.name}</option>
+          ))}
+        </optgroup>
+      ))}
+    </select>
+  );
+
   const renderAISettings = () => (
     <SettingSection
       id="settings-section-ai"
@@ -1185,27 +1293,58 @@ export const SettingsView: React.FC = () => {
         )}
       </SettingRow>
 
+      <SettingRow
+        id="ai-mistral-key"
+        label={t('settings.ai.mistralApiKeyLabel')}
+        description={t('settings.ai.mistralApiKeyDescription')}
+      >
+        <div className="setting-input-group">
+          {aiHasMistralKey ? (
+            <>
+              <input
+                id="ai-mistral-key"
+                type="text"
+                value={aiMistralKeyMasked}
+                disabled
+                placeholder={t('settings.ai.mistralApiKeyConfigured')}
+              />
+              <span className="setting-status-badge success">{t('settings.ai.configured')}</span>
+            </>
+          ) : (
+            <>
+              <input
+                id="ai-mistral-key"
+                type="password"
+                value={newMistralKey}
+                onChange={(e) => setNewMistralKey(e.target.value)}
+                placeholder={t('chat.apiKeyPlaceholder')}
+              />
+              <button className="primary" onClick={handleSaveMistralApiKey} disabled={!newMistralKey.trim()}>
+                {t('chat.apiKeySave')}
+              </button>
+            </>
+          )}
+        </div>
+        {aiHasMistralKey && (
+          <div className="setting-inline-action">
+            <button className="text-button" onClick={() => { setAiHasMistralKey(false); setAiMistralKeyMasked(''); }}>
+              {t('settings.ai.changeMistralApiKey')}
+            </button>
+          </div>
+        )}
+      </SettingRow>
+
       <SettingRow
         id="ai-model"
         label={t('settings.ai.defaultModelLabel')}
         description={t('settings.ai.defaultModelDescription')}
       >
         <div className="setting-input-group">
-          <select
-            id="ai-model"
-            value={selectedModel}
-            onChange={(e) => handleModelChange(e.target.value)}
-            disabled={!aiHasApiKey}
-          >
-            {availableModels.length === 0 && <option value="">{t('settings.ai.noModels')}</option>}
-            {availableModels.map(model => (
-              <option key={model.id} value={model.id}>{model.name}</option>
-            ))}
-          </select>
+          {renderModelSelect('ai-model', selectedModel, handleModelChange, !aiHasApiKey && !aiHasMistralKey)}
           <button
             className="secondary"
             onClick={handleRefreshModelCatalog}
-            disabled={refreshingCatalog || !aiHasApiKey}
+            disabled={refreshingCatalog || (!aiHasApiKey && !aiHasMistralKey)}
             title={t('settings.ai.refreshModelCatalog')}
           >
             {refreshingCatalog ? t('settings.ai.refreshing') : t('settings.ai.refreshModelCatalog')}
@@ -1232,6 +1371,22 @@ export const SettingsView: React.FC = () => {
         })()}
       </SettingRow>
 
+      <SettingRow
+        id="ai-title-model"
+        label={t('settings.ai.titleModelLabel')}
+        description={t('settings.ai.titleModelDescription')}
+      >
+        {renderModelSelect('ai-title-model', titleModel, handleTitleModelChange, !aiHasApiKey && !aiHasMistralKey)}
+      </SettingRow>
+
+      <SettingRow
+        id="ai-image-analysis-model"
+        label={t('settings.ai.imageAnalysisModelLabel')}
+        description={t('settings.ai.imageAnalysisModelDescription')}
+      >
+        {renderModelSelect('ai-image-analysis-model', imageAnalysisModel, handleImageAnalysisModelChange, !aiHasApiKey && !aiHasMistralKey)}
+      </SettingRow>
+
       <SettingRow
         id="ai-system-prompt"
         label={t('settings.ai.systemPromptLabel')}

src/renderer/i18n/locales/de.json

@@ -733,6 +733,18 @@
   "settings.ai.modelInfoOutputPrice": "Ausgabe",
   "settings.ai.modelInfoTokens": "Token",
   "settings.ai.modelInfoPerMTok": "/MTok",
+  "settings.ai.mistralApiKeyLabel": "Mistral API-Schlüssel",
+  "settings.ai.mistralApiKeyDescription": "Ihr API-Schlüssel von Mistral AI. Ermöglicht Mistral-Modelle als Alternative zu OpenCode.",
+  "settings.ai.mistralApiKeyConfigured": "Mistral API-Schlüssel konfiguriert",
+  "settings.ai.changeMistralApiKey": "Mistral API-Schlüssel ändern",
+  "settings.ai.titleModelLabel": "Titelgenerierungsmodell",
+  "settings.ai.titleModelDescription": "Modell zur automatischen Generierung von Konversationstiteln.",
+  "settings.ai.imageAnalysisModelLabel": "Bildanalyse-Modell",
+  "settings.ai.imageAnalysisModelDescription": "Modell für die automatische Bildanalyse (Titel, Alt-Text, Bildunterschrift).",
+  "settings.ai.providerOpenCode": "OpenCode",
+  "settings.ai.providerMistral": "Mistral",
+  "settings.ai.providerOther": "Andere",
+  "chat.providerKeyMissing": "Das Modell '{{model}}' benötigt einen {{provider}} API-Schlüssel. Konfigurieren Sie ihn in den Einstellungen.",
   "settings.toast.modelCatalogRefreshed": "Modellkatalog aktualisiert ({{count}} Modelle)",
   "settings.toast.modelCatalogUpToDate": "Modellkatalog ist bereits aktuell",
   "settings.toast.modelCatalogRefreshFailed": "Modellkatalog konnte nicht aktualisiert werden",

src/renderer/i18n/locales/en.json

@@ -733,6 +733,18 @@
   "settings.ai.modelInfoOutputPrice": "Output",
   "settings.ai.modelInfoTokens": "tokens",
   "settings.ai.modelInfoPerMTok": "/MTok",
+  "settings.ai.mistralApiKeyLabel": "Mistral API Key",
+  "settings.ai.mistralApiKeyDescription": "Your API key from Mistral AI. Enables Mistral models as an alternative to OpenCode.",
+  "settings.ai.mistralApiKeyConfigured": "Mistral API key configured",
+  "settings.ai.changeMistralApiKey": "Change Mistral API Key",
+  "settings.ai.titleModelLabel": "Title Generation Model",
+  "settings.ai.titleModelDescription": "Model used to generate conversation titles automatically.",
+  "settings.ai.imageAnalysisModelLabel": "Image Analysis Model",
+  "settings.ai.imageAnalysisModelDescription": "Model used for automatic image analysis (title, alt text, caption).",
+  "settings.ai.providerOpenCode": "OpenCode",
+  "settings.ai.providerMistral": "Mistral",
+  "settings.ai.providerOther": "Other",
+  "chat.providerKeyMissing": "The model '{{model}}' requires a {{provider}} API key. Configure it in Settings.",
   "settings.toast.modelCatalogRefreshed": "Model catalog updated ({{count}} models)",
   "settings.toast.modelCatalogUpToDate": "Model catalog already up to date",
   "settings.toast.modelCatalogRefreshFailed": "Failed to refresh model catalog",

src/renderer/i18n/locales/es.json

@@ -733,6 +733,18 @@
   "settings.ai.modelInfoOutputPrice": "Salida",
   "settings.ai.modelInfoTokens": "tokens",
   "settings.ai.modelInfoPerMTok": "/MTok",
+  "settings.ai.mistralApiKeyLabel": "Clave API de Mistral",
+  "settings.ai.mistralApiKeyDescription": "Su clave API de Mistral AI. Habilita los modelos Mistral como alternativa a OpenCode.",
+  "settings.ai.mistralApiKeyConfigured": "Clave API de Mistral configurada",
+  "settings.ai.changeMistralApiKey": "Cambiar clave API de Mistral",
+  "settings.ai.titleModelLabel": "Modelo de generación de títulos",
+  "settings.ai.titleModelDescription": "Modelo utilizado para generar títulos de conversación automáticamente.",
+  "settings.ai.imageAnalysisModelLabel": "Modelo de análisis de imágenes",
+  "settings.ai.imageAnalysisModelDescription": "Modelo utilizado para el análisis automático de imágenes (título, texto alternativo, leyenda).",
+  "settings.ai.providerOpenCode": "OpenCode",
+  "settings.ai.providerMistral": "Mistral",
+  "settings.ai.providerOther": "Otro",
+  "chat.providerKeyMissing": "El modelo '{{model}}' requiere una clave API de {{provider}}. Configúrela en Ajustes.",
   "settings.toast.modelCatalogRefreshed": "Catálogo actualizado ({{count}} modelos)",
   "settings.toast.modelCatalogUpToDate": "El catálogo ya está actualizado",
   "settings.toast.modelCatalogRefreshFailed": "No se pudo actualizar el catálogo",

src/renderer/i18n/locales/fr.json

@@ -731,6 +731,18 @@
   "settings.ai.modelInfoOutputPrice": "Sortie",
   "settings.ai.modelInfoTokens": "tokens",
   "settings.ai.modelInfoPerMTok": "/MTok",
+  "settings.ai.mistralApiKeyLabel": "Clé API Mistral",
+  "settings.ai.mistralApiKeyDescription": "Votre clé API Mistral AI. Permet d'utiliser les modèles Mistral comme alternative à OpenCode.",
+  "settings.ai.mistralApiKeyConfigured": "Clé API Mistral configurée",
+  "settings.ai.changeMistralApiKey": "Modifier la clé API Mistral",
+  "settings.ai.titleModelLabel": "Modèle de génération de titres",
+  "settings.ai.titleModelDescription": "Modèle utilisé pour générer automatiquement les titres de conversation.",
+  "settings.ai.imageAnalysisModelLabel": "Modèle d'analyse d'images",
+  "settings.ai.imageAnalysisModelDescription": "Modèle utilisé pour l'analyse automatique d'images (titre, texte alternatif, légende).",
+  "settings.ai.providerOpenCode": "OpenCode",
+  "settings.ai.providerMistral": "Mistral",
+  "settings.ai.providerOther": "Autre",
+  "chat.providerKeyMissing": "Le modèle '{{model}}' nécessite une clé API {{provider}}. Configurez-la dans les paramètres.",
   "settings.toast.modelCatalogRefreshed": "Catalogue mis à jour ({{count}} modèles)",
   "settings.toast.modelCatalogUpToDate": "Le catalogue est déjà à jour",
   "settings.toast.modelCatalogRefreshFailed": "Échec de l'actualisation du catalogue",

src/renderer/i18n/locales/it.json

@@ -731,6 +731,18 @@
   "settings.ai.modelInfoOutputPrice": "Output",
   "settings.ai.modelInfoTokens": "token",
   "settings.ai.modelInfoPerMTok": "/MTok",
+  "settings.ai.mistralApiKeyLabel": "Chiave API Mistral",
+  "settings.ai.mistralApiKeyDescription": "La tua chiave API Mistral AI. Abilita i modelli Mistral come alternativa a OpenCode.",
+  "settings.ai.mistralApiKeyConfigured": "Chiave API Mistral configurata",
+  "settings.ai.changeMistralApiKey": "Cambia chiave API Mistral",
+  "settings.ai.titleModelLabel": "Modello di generazione titoli",
+  "settings.ai.titleModelDescription": "Modello utilizzato per generare automaticamente i titoli delle conversazioni.",
+  "settings.ai.imageAnalysisModelLabel": "Modello di analisi immagini",
+  "settings.ai.imageAnalysisModelDescription": "Modello utilizzato per l'analisi automatica delle immagini (titolo, testo alternativo, didascalia).",
+  "settings.ai.providerOpenCode": "OpenCode",
+  "settings.ai.providerMistral": "Mistral",
+  "settings.ai.providerOther": "Altro",
+  "chat.providerKeyMissing": "Il modello '{{model}}' richiede una chiave API {{provider}}. Configurala nelle Impostazioni.",
   "settings.toast.modelCatalogRefreshed": "Catalogo aggiornato ({{count}} modelli)",
   "settings.toast.modelCatalogUpToDate": "Il catalogo è già aggiornato",
   "settings.toast.modelCatalogRefreshFailed": "Aggiornamento del catalogo non riuscito",

tests/engine/OpenCodeManagerMistral.test.ts

@@ -0,0 +1,511 @@
+/**
+ * OpenCodeManager Mistral Integration Tests
+ *
+ * Tests for Mistral AI as a first-class alternative provider:
+ * - detectProvider() for Mistral model prefixes
+ * - Mistral API key storage and retrieval
+ * - checkReady() multi-provider support
+ * - getAvailableModels() merge from both providers
+ * - getProviderConfig() helper
+ * - isProviderKeySet() helper
+ * - MODEL_CONTEXT_BUDGETS correctness
+ * - MODEL_CAPABILITIES (vision flags)
+ * - validateMistralApiKey()
+ * - Provider-aware routing in sendOpenAIMessage()
+ * - generateConversationTitle() provider routing
+ * - analyzeMediaImage() provider-aware routing
+ * - analyzeTaxonomy() provider-aware guards
+ */
+
+import { describe, it, expect, beforeEach, vi, afterEach } from 'vitest';
+
+// Mock dependencies before importing the class
+vi.mock('../../src/main/engine/ChatEngine', () => ({
+  ChatEngine: class {
+    getSetting = vi.fn().mockResolvedValue(null);
+    setSetting = vi.fn().mockResolvedValue(undefined);
+    deleteSetting = vi.fn().mockResolvedValue(undefined);
+    getSelectedModel = vi.fn().mockResolvedValue('claude-sonnet-4-5');
+    getDefaultSystemPrompt = vi.fn().mockResolvedValue('You are a helpful assistant.');
+    getConversation = vi.fn();
+    addMessage = vi.fn();
+    updateConversation = vi.fn();
+  },
+}));
+
+vi.mock('../../src/main/engine/PostEngine', () => ({
+  getPostEngine: vi.fn(() => ({})),
+}));
+
+vi.mock('../../src/main/engine/MediaEngine', () => ({
+  getMediaEngine: vi.fn(() => ({})),
+}));
+
+vi.mock('../../src/main/database', () => ({
+  getDatabase: vi.fn(() => ({})),
+}));
+
+import { OpenCodeManager, type ModelInfo } from '../../src/main/engine/OpenCodeManager';
+
+// Helper to create manager with mocked httpRequest
+function createManager(): OpenCodeManager {
+  const manager = new OpenCodeManager(
+    {
+      getSetting: vi.fn().mockResolvedValue(null),
+      setSetting: vi.fn().mockResolvedValue(undefined),
+      deleteSetting: vi.fn().mockResolvedValue(undefined),
+      getSelectedModel: vi.fn().mockResolvedValue('claude-sonnet-4-5'),
+      getDefaultSystemPrompt: vi.fn().mockResolvedValue('You are a helpful assistant.'),
+    } as never,
+    {} as never,
+    {} as never,
+    {} as never,
+    () => null,
+  );
+  return manager;
+}
+
+// Mock Mistral models API response
+function createMistralModelResponse(ids: string[]) {
+  return {
+    object: 'list',
+    data: ids.map(id => ({
+      id,
+      object: 'model',
+      created: 1772132920,
+      owned_by: 'mistralai',
+    })),
+  };
+}
+
+// Mock Zen models API response
+function createZenModelResponse(ids: string[]) {
+  return {
+    object: 'list',
+    data: ids.map(id => ({
+      id,
+      object: 'model',
+      created: 1772132920,
+      owned_by: 'opencode',
+    })),
+  };
+}
+
+describe('OpenCodeManager Mistral integration', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    vi.useFakeTimers();
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  describe('detectProvider', () => {
+    it('detects mistral model prefixes', () => {
+      const manager = createManager();
+      const detect = (manager as any).detectProvider.bind(manager);
+
+      expect(detect('mistral-large-latest')).toBe('mistral');
+      expect(detect('mistral-medium-latest')).toBe('mistral');
+      expect(detect('mistral-small-latest')).toBe('mistral');
+    });
+
+    it('detects devstral model prefix', () => {
+      const manager = createManager();
+      const detect = (manager as any).detectProvider.bind(manager);
+
+      expect(detect('devstral-small-latest')).toBe('mistral');
+      expect(detect('devstral-large-latest')).toBe('mistral');
+    });
+
+    it('detects codestral model prefix', () => {
+      const manager = createManager();
+      const detect = (manager as any).detectProvider.bind(manager);
+
+      expect(detect('codestral-latest')).toBe('mistral');
+    });
+
+    it('detects pixtral model prefix', () => {
+      const manager = createManager();
+      const detect = (manager as any).detectProvider.bind(manager);
+
+      expect(detect('pixtral-large-latest')).toBe('mistral');
+    });
+
+    it('detects ministral model prefix', () => {
+      const manager = createManager();
+      const detect = (manager as any).detectProvider.bind(manager);
+
+      expect(detect('ministral-8b-latest')).toBe('mistral');
+    });
+
+    it('still detects anthropic, openai, google providers', () => {
+      const manager = createManager();
+      const detect = (manager as any).detectProvider.bind(manager);
+
+      expect(detect('claude-sonnet-4')).toBe('anthropic');
+      expect(detect('gpt-5')).toBe('openai');
+      expect(detect('gemini-3-pro')).toBe('google');
+    });
+  });
+
+  describe('Mistral API key management', () => {
+    it('stores and retrieves Mistral API key', () => {
+      const manager = createManager();
+
+      expect(manager.getMistralApiKey()).toBe('');
+
+      manager.setMistralApiKey('mist-test-key-123');
+      expect(manager.getMistralApiKey()).toBe('mist-test-key-123');
+    });
+
+    it('invalidates model cache when Mistral key changes', async () => {
+      const manager = createManager();
+      manager.setApiKey('opencode-key');
+
+      // Prime the cache
+      (manager as any).httpRequest = vi.fn().mockResolvedValue({
+        statusCode: 200,
+        body: JSON.stringify(createZenModelResponse(['claude-sonnet-4'])),
+      });
+      await manager.getAvailableModels();
+
+      // Set Mistral key — should clear cache
+      manager.setMistralApiKey('mist-key');
+      expect((manager as any).cachedModels).toBeNull();
+    });
+  });
+
+  describe('checkReady', () => {
+    it('returns ready when only OpenCode key is set', async () => {
+      const manager = createManager();
+      manager.setApiKey('opencode-key');
+
+      const result = await manager.checkReady();
+      expect(result.ready).toBe(true);
+      expect(result.providers?.opencode).toBe(true);
+      expect(result.providers?.mistral).toBe(false);
+    });
+
+    it('returns ready when only Mistral key is set', async () => {
+      const manager = createManager();
+      manager.setMistralApiKey('mistral-key');
+
+      const result = await manager.checkReady();
+      expect(result.ready).toBe(true);
+      expect(result.providers?.opencode).toBe(false);
+      expect(result.providers?.mistral).toBe(true);
+    });
+
+    it('returns ready when both keys are set', async () => {
+      const manager = createManager();
+      manager.setApiKey('opencode-key');
+      manager.setMistralApiKey('mistral-key');
+
+      const result = await manager.checkReady();
+      expect(result.ready).toBe(true);
+      expect(result.providers?.opencode).toBe(true);
+      expect(result.providers?.mistral).toBe(true);
+    });
+
+    it('returns not ready when no keys are set', async () => {
+      const manager = createManager();
+
+      const result = await manager.checkReady();
+      expect(result.ready).toBe(false);
+      expect(result.providers?.opencode).toBe(false);
+      expect(result.providers?.mistral).toBe(false);
+    });
+  });
+
+  describe('isProviderKeySet', () => {
+    it('checks OpenCode key availability', () => {
+      const manager = createManager();
+      const check = (manager as any).isProviderKeySet.bind(manager);
+
+      expect(check('opencode')).toBe(false);
+      expect(check('anthropic')).toBe(false);
+      expect(check('openai')).toBe(false);
+
+      manager.setApiKey('key');
+      expect(check('opencode')).toBe(true);
+      expect(check('anthropic')).toBe(true);
+      expect(check('openai')).toBe(true);
+      expect(check('google')).toBe(true);
+      expect(check('other')).toBe(true);
+    });
+
+    it('checks Mistral key availability', () => {
+      const manager = createManager();
+      const check = (manager as any).isProviderKeySet.bind(manager);
+
+      expect(check('mistral')).toBe(false);
+
+      manager.setMistralApiKey('key');
+      expect(check('mistral')).toBe(true);
+    });
+  });
+
+  describe('getProviderConfig', () => {
+    it('returns OpenCode config for anthropic provider', () => {
+      const manager = createManager();
+      manager.setApiKey('oc-key');
+      const config = (manager as any).getProviderConfig.call(manager, 'anthropic');
+
+      expect(config.apiKey).toBe('oc-key');
+    });
+
+    it('returns Mistral config for mistral provider', () => {
+      const manager = createManager();
+      manager.setMistralApiKey('mist-key');
+      const config = (manager as any).getProviderConfig.call(manager, 'mistral');
+
+      expect(config.apiKey).toBe('mist-key');
+      expect(config.apiUrl).toContain('mistral.ai');
+      expect(config.options?.parallelToolCalls).toBe(false);
+    });
+  });
+
+  describe('getAvailableModels', () => {
+    it('returns only OpenCode models when only OpenCode key is set', async () => {
+      const manager = createManager();
+      manager.setApiKey('oc-key');
+
+      (manager as any).httpRequest = vi.fn().mockResolvedValue({
+        statusCode: 200,
+        body: JSON.stringify(createZenModelResponse(['claude-sonnet-4', 'gpt-5'])),
+      });
+
+      const models = await manager.getAvailableModels();
+      const providers = new Set(models.map((m: ModelInfo) => m.provider));
+      expect(providers.has('mistral')).toBe(false);
+    });
+
+    it('returns only Mistral models when only Mistral key is set', async () => {
+      const manager = createManager();
+      manager.setMistralApiKey('mist-key');
+
+      (manager as any).httpRequest = vi.fn().mockImplementation((url: string) => {
+        if (url.includes('mistral.ai')) {
+          return Promise.resolve({
+            statusCode: 200,
+            body: JSON.stringify(createMistralModelResponse([
+              'mistral-large-latest',
+              'mistral-small-latest',
+            ])),
+          });
+        }
+        return Promise.reject(new Error('No key'));
+      });
+
+      const models = await manager.getAvailableModels();
+      expect(models.length).toBe(2);
+      expect(models.every((m: ModelInfo) => m.provider === 'mistral')).toBe(true);
+    });
+
+    it('merges models from both providers when both keys are set', async () => {
+      const manager = createManager();
+      manager.setApiKey('oc-key');
+      manager.setMistralApiKey('mist-key');
+
+      let callCount = 0;
+      (manager as any).httpRequest = vi.fn().mockImplementation((url: string) => {
+        callCount++;
+        if (url.includes('mistral.ai')) {
+          return Promise.resolve({
+            statusCode: 200,
+            body: JSON.stringify(createMistralModelResponse([
+              'mistral-large-latest',
+              'mistral-small-latest',
+            ])),
+          });
+        }
+        return Promise.resolve({
+          statusCode: 200,
+          body: JSON.stringify(createZenModelResponse(['claude-sonnet-4', 'gpt-5'])),
+        });
+      });
+
+      const models = await manager.getAvailableModels();
+      expect(models.length).toBe(4);
+
+      const providers = new Set(models.map((m: ModelInfo) => m.provider));
+      expect(providers.has('anthropic')).toBe(true);
+      expect(providers.has('mistral')).toBe(true);
+    });
+
+    it('includes vision field on models', async () => {
+      const manager = createManager();
+      manager.setMistralApiKey('mist-key');
+
+      (manager as any).httpRequest = vi.fn().mockImplementation((url: string) => {
+        if (url.includes('mistral.ai')) {
+          return Promise.resolve({
+            statusCode: 200,
+            body: JSON.stringify(createMistralModelResponse([
+              'mistral-large-latest',
+              'devstral-small-latest',
+            ])),
+          });
+        }
+        return Promise.reject(new Error('No key'));
+      });
+
+      const models = await manager.getAvailableModels();
+      const large = models.find((m: ModelInfo) => m.id === 'mistral-large-latest');
+      const devstral = models.find((m: ModelInfo) => m.id === 'devstral-small-latest');
+
+      expect(large?.vision).toBe(true);
+      expect(devstral?.vision).toBe(false);
+    });
+
+    it('fallback model list filters by available provider keys', async () => {
+      const manager = createManager();
+      manager.setMistralApiKey('mist-key');
+      // No OpenCode key set
+
+      (manager as any).httpRequest = vi.fn().mockRejectedValue(new Error('Network error'));
+
+      const models = await manager.getAvailableModels();
+      // Should only have Mistral models from fallback
+      const providers = new Set(models.map((m: ModelInfo) => m.provider));
+      expect(providers.has('mistral')).toBe(true);
+      expect(providers.has('anthropic')).toBe(false);
+      expect(providers.has('openai')).toBe(false);
+    });
+  });
+
+  describe('validateMistralApiKey', () => {
+    it('validates a correct Mistral API key', async () => {
+      const manager = createManager();
+      (manager as any).httpRequest = vi.fn().mockResolvedValue({
+        statusCode: 200,
+        body: JSON.stringify(createMistralModelResponse(['mistral-large-latest'])),
+      });
+
+      const result = await manager.validateMistralApiKey('valid-key');
+      expect(result.isValid).toBe(true);
+      expect(result.models.length).toBeGreaterThan(0);
+    });
+
+    it('rejects an invalid Mistral API key', async () => {
+      const manager = createManager();
+      (manager as any).httpRequest = vi.fn().mockResolvedValue({
+        statusCode: 401,
+        body: '{"message":"Unauthorized"}',
+      });
+
+      const result = await manager.validateMistralApiKey('bad-key');
+      expect(result.isValid).toBe(false);
+      expect(result.models).toEqual([]);
+    });
+
+    it('rejects empty key', async () => {
+      const manager = createManager();
+      const result = await manager.validateMistralApiKey('');
+      expect(result.isValid).toBe(false);
+    });
+  });
+
+  describe('MODEL_DISPLAY_NAMES includes Mistral models', () => {
+    it('has display names for all target Mistral models', () => {
+      const manager = createManager();
+      const format = (manager as any).formatModelName.bind(manager);
+
+      expect(format('mistral-large-latest')).toBe('Mistral Large');
+      expect(format('mistral-medium-latest')).toBe('Mistral Medium');
+      expect(format('mistral-small-latest')).toBe('Mistral Small');
+      expect(format('devstral-small-latest')).toBe('Devstral Small');
+      expect(format('devstral-large-latest')).toBe('Devstral Large');
+    });
+  });
+
+  describe('generateConversationTitle provider routing', () => {
+    it('uses Mistral API when conversation model is a Mistral model', async () => {
+      const manager = createManager();
+      manager.setMistralApiKey('mist-key');
+
+      const httpMock = vi.fn().mockResolvedValue({
+        statusCode: 200,
+        body: JSON.stringify({
+          choices: [{ message: { content: 'Travel Blog' } }],
+        }),
+      });
+      (manager as any).httpRequest = httpMock;
+
+      // Set the title model to mistral
+      (manager as any).chatEngine.getSetting = vi.fn().mockImplementation(async (key: string) => {
+        if (key === 'chat_title_model') return 'mistral-small-latest';
+        return null;
+      });
+
+      await (manager as any).generateConversationTitle('conv-1', 'Hello world', 'Response');
+
+      expect(httpMock).toHaveBeenCalled();
+      const callUrl = httpMock.mock.calls[0][0];
+      expect(callUrl).toContain('mistral.ai');
+    });
+
+    it('uses Anthropic API when title model is an Anthropic model', async () => {
+      const manager = createManager();
+      manager.setApiKey('oc-key');
+
+      const httpMock = vi.fn().mockResolvedValue({
+        statusCode: 200,
+        body: JSON.stringify({
+          content: [{ type: 'text', text: 'Travel Blog' }],
+        }),
+      });
+      (manager as any).httpRequest = httpMock;
+
+      // No title model set — defaults to claude-haiku-4-5
+      await (manager as any).generateConversationTitle('conv-1', 'Hello world', 'Response');
+
+      expect(httpMock).toHaveBeenCalled();
+      const callUrl = httpMock.mock.calls[0][0];
+      expect(callUrl).toContain('opencode.ai');
+    });
+  });
+
+  describe('analyzeTaxonomy provider-aware guards', () => {
+    it('returns error when model is Mistral but no Mistral key is set', async () => {
+      const manager = createManager();
+      manager.setApiKey('oc-key'); // only OpenCode key
+
+      const result = await manager.analyzeTaxonomy(
+        [{ name: 'Travel', slug: 'travel', existsInProject: true }],
+        [],
+        'mistral-large-latest'
+      );
+
+      expect(result.success).toBe(false);
+      expect(result.error).toContain('API key');
+    });
+
+    it('returns error when model is OpenCode but no OpenCode key is set', async () => {
+      const manager = createManager();
+      manager.setMistralApiKey('mist-key'); // only Mistral key
+
+      const result = await manager.analyzeTaxonomy(
+        [{ name: 'Travel', slug: 'travel', existsInProject: true }],
+        [],
+        'claude-sonnet-4'
+      );
+
+      expect(result.success).toBe(false);
+      expect(result.error).toContain('API key');
+    });
+  });
+
+  describe('analyzeMediaImage provider-aware routing', () => {
+    it('returns error when no API key is available for the configured model', async () => {
+      const manager = createManager();
+      // No keys set at all
+
+      const result = await manager.analyzeMediaImage('media-1', 'en');
+      expect(result.success).toBe(false);
+      expect(result.error).toContain('API key');
+    });
+  });
+});

tests/engine/OpenCodeModelDiscovery.test.ts

@@ -150,9 +150,9 @@ describe('OpenCodeManager model discovery', () => {
       const models = await manager.getAvailableModels();
 
       expect(models).toHaveLength(3);
-      expect(models[0]).toEqual({ id: 'claude-sonnet-4', name: 'Claude Sonnet 4', provider: 'anthropic' });
-      expect(models[1]).toEqual({ id: 'gpt-5.1-codex', name: 'GPT 5.1 Codex', provider: 'openai' });
-      expect(models[2]).toEqual({ id: 'gemini-3-pro', name: 'Gemini 3 Pro', provider: 'google' });
+      expect(models[0]).toEqual({ id: 'claude-sonnet-4', name: 'Claude Sonnet 4', provider: 'anthropic', vision: true });
+      expect(models[1]).toEqual({ id: 'gpt-5.1-codex', name: 'GPT 5.1 Codex', provider: 'openai', vision: false });
+      expect(models[2]).toEqual({ id: 'gemini-3-pro', name: 'Gemini 3 Pro', provider: 'google', vision: true });
     });
 
     it('falls back to known models when API fails', async () => {
@@ -238,12 +238,15 @@ describe('OpenCodeManager model discovery', () => {
     it('falls back to known models when no API key is set', async () => {
       const manager = createManager();
       (manager as any).apiKey = '';
+      // Set a key so fallback filtering works (at least one provider must have a key)
+      manager.setMistralApiKey('test-key');
 
       const models = await manager.getAvailableModels();
 
+      // Only Mistral models will be in fallback since only Mistral key is set
       expect(models.length).toBeGreaterThan(0);
-      const ids = models.map((m: ModelInfo) => m.id);
-      expect(ids).toContain('claude-sonnet-4');
+      const providers = new Set(models.map((m: ModelInfo) => m.provider));
+      expect(providers.has('mistral')).toBe(true);
     });
   });
 });

tests/renderer/a2ui/surfaceActionWiring.test.tsx

@@ -83,6 +83,13 @@ function setupChatApi() {
     onA2UIMessage: vi.fn(() => vi.fn()),
     onTokenUsage: vi.fn(() => vi.fn()),
     dispatchA2UIAction: vi.fn(),
+    validateMistralApiKey: vi.fn().mockResolvedValue({ isValid: false, models: [] }),
+    setMistralApiKey: vi.fn().mockResolvedValue({ success: true }),
+    getMistralApiKey: vi.fn().mockResolvedValue({ hasKey: false, maskedKey: '' }),
+    getTitleModel: vi.fn().mockResolvedValue({ success: true, modelId: 'claude-haiku-4-5' }),
+    setTitleModel: vi.fn().mockResolvedValue({ success: true }),
+    getImageAnalysisModel: vi.fn().mockResolvedValue({ success: true, modelId: 'claude-sonnet-4-5' }),
+    setImageAnalysisModel: vi.fn().mockResolvedValue({ success: true }),
   } as never;
 }
 

tests/renderer/components/AssistantSidebar.wiring.test.tsx

@@ -39,6 +39,13 @@ describe('AssistantSidebar wiring', () => {
       onA2UIMessage: vi.fn(() => vi.fn()),
       onTokenUsage: vi.fn(() => vi.fn()),
       dispatchA2UIAction: vi.fn(),
+      validateMistralApiKey: vi.fn().mockResolvedValue({ isValid: false, models: [] }),
+      setMistralApiKey: vi.fn().mockResolvedValue({ success: true }),
+      getMistralApiKey: vi.fn().mockResolvedValue({ hasKey: false, maskedKey: '' }),
+      getTitleModel: vi.fn().mockResolvedValue({ success: true, modelId: 'claude-haiku-4-5' }),
+      setTitleModel: vi.fn().mockResolvedValue({ success: true }),
+      getImageAnalysisModel: vi.fn().mockResolvedValue({ success: true, modelId: 'claude-sonnet-4-5' }),
+      setImageAnalysisModel: vi.fn().mockResolvedValue({ success: true }),
     } as never;
   });
 

tests/renderer/components/SettingsView.i18n.test.tsx

@@ -45,6 +45,10 @@ describe('SettingsView i18n', () => {
         getSystemPrompt: vi.fn().mockResolvedValue({ success: true, prompt: '' }),
         getApiKey: vi.fn().mockResolvedValue({ hasKey: false, maskedKey: '' }),
         getAvailableModels: vi.fn().mockResolvedValue({ success: true, models: [], selectedModel: '' }),
+        getMistralApiKey: vi.fn().mockResolvedValue({ hasKey: false, maskedKey: '' }),
+        getTitleModel: vi.fn().mockResolvedValue({ success: true, modelId: 'claude-haiku-4-5' }),
+        getImageAnalysisModel: vi.fn().mockResolvedValue({ success: true, modelId: 'claude-sonnet-4-5' }),
+        getModelCatalog: vi.fn().mockResolvedValue({ success: true, entries: [] }),
       },
       templates: {
         ...(window as Window & { electronAPI: any }).electronAPI?.templates,

tests/renderer/components/SettingsView.test.tsx

@@ -35,6 +35,10 @@ describe('MCPAgentButton uninstall', () => {
         getSystemPrompt: vi.fn().mockResolvedValue({ success: true, prompt: '' }),
         getApiKey: vi.fn().mockResolvedValue({ hasKey: false, maskedKey: '' }),
         getAvailableModels: vi.fn().mockResolvedValue({ success: true, models: [], selectedModel: '' }),
+        getMistralApiKey: vi.fn().mockResolvedValue({ hasKey: false, maskedKey: '' }),
+        getTitleModel: vi.fn().mockResolvedValue({ success: true, modelId: 'claude-haiku-4-5' }),
+        getImageAnalysisModel: vi.fn().mockResolvedValue({ success: true, modelId: 'claude-sonnet-4-5' }),
+        getModelCatalog: vi.fn().mockResolvedValue({ success: true, entries: [] }),
       },
       templates: { getEnabledByKind: vi.fn().mockResolvedValue([]) },
       projects: { update: vi.fn().mockResolvedValue({}) },

tests/renderer/navigation/assistantSidebarGuards.test.ts

@@ -37,6 +37,13 @@ describe('assistant sidebar guard rails', () => {
       onA2UIMessage: vi.fn(() => vi.fn()),
       onTokenUsage: vi.fn(() => vi.fn()),
       dispatchA2UIAction: vi.fn(),
+      validateMistralApiKey: vi.fn().mockResolvedValue({ isValid: false, models: [] }),
+      setMistralApiKey: vi.fn().mockResolvedValue({ success: true }),
+      getMistralApiKey: vi.fn().mockResolvedValue({ hasKey: false, maskedKey: '' }),
+      getTitleModel: vi.fn().mockResolvedValue({ success: true, modelId: 'claude-haiku-4-5' }),
+      setTitleModel: vi.fn().mockResolvedValue({ success: true }),
+      getImageAnalysisModel: vi.fn().mockResolvedValue({ success: true, modelId: 'claude-sonnet-4-5' }),
+      setImageAnalysisModel: vi.fn().mockResolvedValue({ success: true }),
     } as never;
   });
 

tests/renderer/navigation/chatSurfaceModeUsageGuards.test.ts

@@ -48,6 +48,13 @@ describe('chat surface mode usage guards', () => {
       onA2UIMessage: vi.fn(() => vi.fn()),
       onTokenUsage: vi.fn(() => vi.fn()),
       dispatchA2UIAction: vi.fn(),
+      validateMistralApiKey: vi.fn().mockResolvedValue({ isValid: false, models: [] }),
+      setMistralApiKey: vi.fn().mockResolvedValue({ success: true }),
+      getMistralApiKey: vi.fn().mockResolvedValue({ hasKey: false, maskedKey: '' }),
+      getTitleModel: vi.fn().mockResolvedValue({ success: true, modelId: 'claude-haiku-4-5' }),
+      setTitleModel: vi.fn().mockResolvedValue({ success: true }),
+      getImageAnalysisModel: vi.fn().mockResolvedValue({ success: true, modelId: 'claude-sonnet-4-5' }),
+      setImageAnalysisModel: vi.fn().mockResolvedValue({ success: true }),
     } as never;
   });
 

tests/renderer/navigation/chatSurfaceUsageGuards.test.ts

@@ -51,6 +51,13 @@ describe('chat surface shared usage guards', () => {
       onA2UIMessage: vi.fn(() => vi.fn()),
       onTokenUsage: vi.fn(() => vi.fn()),
       dispatchA2UIAction: vi.fn(),
+      validateMistralApiKey: vi.fn().mockResolvedValue({ isValid: false, models: [] }),
+      setMistralApiKey: vi.fn().mockResolvedValue({ success: true }),
+      getMistralApiKey: vi.fn().mockResolvedValue({ hasKey: false, maskedKey: '' }),
+      getTitleModel: vi.fn().mockResolvedValue({ success: true, modelId: 'claude-haiku-4-5' }),
+      setTitleModel: vi.fn().mockResolvedValue({ success: true }),
+      getImageAnalysisModel: vi.fn().mockResolvedValue({ success: true, modelId: 'claude-sonnet-4-5' }),
+      setImageAnalysisModel: vi.fn().mockResolvedValue({ success: true }),
     } as never;
   });