fix: prevent DeepSeek v4 reasoning chain from leaking as analysis result

server/src/routes/proxy.ts

@@ -176,7 +176,7 @@ router.post('/api/proxy/ai', async (req, res) => {
       'Accept': 'application/json',
     };
 
-    if (apiType === 'openai' || apiType === 'openai-responses' || apiType === 'openai-compatible') {
+    if (apiType === 'openai' || apiType === 'openai-responses' || apiType === 'openai-compatible' || apiType === 'deepseek') {
       // openai-compatible 类型直接使用 baseUrl 作为完整地址
       targetUrl = apiType === 'openai-compatible'
         ? baseUrl.replace(/\/$/, '')
@@ -197,11 +197,14 @@ router.post('/api/proxy/ai', async (req, res) => {
       targetUrl = urlObj.toString();
     }
 
+    // DeepSeek Reasoner does not support the reasoning parameter
+    const isDeepSeekReasoner = model.trim() === 'deepseek-reasoner';
     const effectiveRequestBody = (
       reasoningEffort
+      && !isDeepSeekReasoner
       && typeof requestBody === 'object'
       && requestBody !== null
-      && (apiType === 'openai' || apiType === 'openai-responses' || apiType === 'openai-compatible')
+      && (apiType === 'openai' || apiType === 'openai-responses' || apiType === 'openai-compatible' || apiType === 'deepseek')
       && !('reasoning' in requestBody)
     )
       ? { ...requestBody, reasoning: { effort: reasoningEffort } }

src/components/settings/AIConfigPanel.tsx

@@ -28,6 +28,7 @@ const DEFAULT_API_ENDPOINTS: Record<AIApiType, string> = {
   'openai-responses': 'https://api.openai.com/v1',
   claude: 'https://api.anthropic.com/v1',
   gemini: 'https://generativelanguage.googleapis.com/v1beta',
+  deepseek: 'https://api.deepseek.com',
   'openai-compatible': '',
 };
 
@@ -392,6 +393,7 @@ Repository information:
                 <option value="openai-responses">OpenAI (Responses)</option>
                 <option value="claude">Claude</option>
                 <option value="gemini">Gemini</option>
+                <option value="deepseek">DeepSeek</option>
                 <option value="openai-compatible">OpenAI Compatible (Custom Endpoint)</option>
               </select>
             </div>
@@ -410,9 +412,11 @@ Repository information:
                     ? 'https://api.openai.com/v1'
                     : form.apiType === 'claude'
                       ? 'https://api.anthropic.com/v1'
-                      : form.apiType === 'openai-compatible'
-                        ? 'https://integrate.api.nvidia.com/v1/chat/completions'
-                        : 'https://generativelanguage.googleapis.com/v1beta'
+                      : form.apiType === 'deepseek'
+                        ? 'https://api.deepseek.com'
+                        : form.apiType === 'openai-compatible'
+                          ? 'https://integrate.api.nvidia.com/v1/chat/completions'
+                          : 'https://generativelanguage.googleapis.com/v1beta'
                 }
               />
               <p className="text-xs text-gray-500 dark:text-text-tertiary mt-1">
@@ -426,10 +430,15 @@ Repository information:
                         '只填到 v1beta 即可，路径会自动生成',
                         'Only include the version prefix v1beta, the path will be generated automatically'
                       )
-                    : t(
-                        '只填到版本号即可（如 .../v1 或 .../v1beta），不要包含 /chat/completions、/responses、/messages',
-                        'Only include the version prefix (e.g. .../v1 or .../v1beta). Do not include /chat/completions, /responses, or /messages.'
-                      )}
+                    : form.apiType === 'deepseek'
+                      ? t(
+                          '填写到域名即可，路径会自动生成',
+                          'Only include the domain, the path will be generated automatically'
+                        )
+                      : t(
+                          '只填到版本号即可（如 .../v1 或 .../v1beta），不要包含 /chat/completions、/responses、/messages',
+                          'Only include the version prefix (e.g. .../v1 or .../v1beta). Do not include /chat/completions, /responses, or /messages.'
+                        )}
               </p>
               {form.baseUrl && (
                 <p className="text-xs text-gray-500 dark:text-text-tertiary mt-1">

src/services/aiService.ts

@@ -119,8 +119,21 @@ export class AIService {
     return effort ? { effort } : undefined;
   }
 
+  private isDeepSeekModel(): boolean {
+    return this.getApiType() === 'deepseek';
+  }
+
   private isDeepSeekReasonerModel(): boolean {
-    return this.getApiType() === 'openai' && this.config.model.trim() === 'deepseek-reasoner';
+    return this.isDeepSeekModel() && this.config.model.trim() === 'deepseek-reasoner';
+  }
+
+  /**
+   * Check if the model is a DeepSeek model with default thinking enabled (e.g. deepseek-v4-pro, deepseek-v4-flash).
+   * These models consume max_tokens for reasoning, leaving 0 tokens for content if max_tokens is too low.
+   * We need to explicitly disable thinking for these models.
+   */
+  private isDeepSeekThinkingModel(): boolean {
+    return this.isDeepSeekModel() && this.config.model.trim() !== 'deepseek-reasoner';
   }
 
   private isMiMoModel(): boolean {
@@ -154,14 +167,15 @@ export class AIService {
     const configId = this.config.id;
     const reasoning = this.getOpenAIReasoningPayload();
 
-    if (apiType === 'openai' || apiType === 'openai-responses' || apiType === 'openai-compatible') {
+    if (apiType === 'openai' || apiType === 'openai-responses' || apiType === 'openai-compatible' || apiType === 'deepseek') {
       const messages = [
         ...(options.system.trim()
           ? [{ role: 'system', content: options.system }]
           : []),
         { role: 'user', content: options.user },
       ];
       const isDeepSeekReasoner = this.isDeepSeekReasonerModel();
+      const isDeepSeekThinking = this.isDeepSeekThinkingModel();
       const isMiMoModel = this.isMiMoModel();
 
       const requestBody = apiType === 'openai-responses'
@@ -171,15 +185,15 @@ export class AIService {
             temperature: options.temperature,
             max_output_tokens: options.maxTokens,
             ...(reasoning ? { reasoning } : {}),
-            ...(isMiMoModel ? { thinking: { type: 'disabled' } } : {}),
+            ...(isMiMoModel || isDeepSeekThinking ? { thinking: { type: 'disabled' } } : {}),
           }
         : {
             model: this.config.model,
             messages,
             max_tokens: options.maxTokens,
             ...(!isDeepSeekReasoner ? { temperature: options.temperature } : {}),
             ...(!isDeepSeekReasoner && reasoning && apiType !== 'openai-compatible' ? { reasoning } : {}),
-            ...(isMiMoModel ? { thinking: { type: 'disabled' } } : {}),
+            ...(isMiMoModel || isDeepSeekThinking ? { thinking: { type: 'disabled' } } : {}),
           };
 
       let data: Record<string, unknown>;
@@ -264,11 +278,18 @@ export class AIService {
           return content;
         }
 
+        // Only fall back to reasoning_content for the dedicated deepseek-reasoner model.
+        // Other DeepSeek models (e.g. deepseek-v4-flash, deepseek-v4-pro) may also return
+        // reasoning_content (the thinking chain), but we must not use it as the final answer.
         const reasoningContent = message?.reasoning_content;
-        if (reasoningContent) {
+        if (reasoningContent && isDeepSeekReasoner) {
           this.logAIRequestDebug(startTime, { apiType, model, configId }, { responseLength: reasoningContent.length }, httpDetails);
           return reasoningContent;
         }
+
+        if (!content && reasoningContent) {
+          logger.warn('ai', 'Model returned reasoning_content but empty content', { model, configId });
+        }
       }
 
       this.logAIRequestDebug(startTime, { apiType, model, configId }, { error: 'request failed' }, httpDetails);
@@ -479,7 +500,7 @@ ${options.user}` : options.user;
         system,
         user: prompt,
         temperature: 0.3,
-        maxTokens: 700,
+        maxTokens: 1000,
         signal,
       });
 
@@ -587,8 +608,12 @@ ${repoInfo}
 
   private parseAIResponse(content: string): { summary: string; tags: string[]; platforms: string[] } {
     try {
+      // Strip thinking tags that some models embed in the content field (e.g. <think>...</think>)
+      // Also handle truncated tags (dangling <think> without </think>) from token exhaustion
       const cleaned = content
         .trim()
+        .replace(/<think>[\s\S]*?<\/think>/gi, '')
+        .replace(/<think>[\s\S]*$/gi, '')
         .replace(/^```(?:json)?\s*/i, '')
         .replace(/\s*```$/i, '')
         .trim();

src/types/index.ts

@@ -127,7 +127,7 @@ export interface GitHubUser {
   email: string | null;
 }
 
-export type AIApiType = 'openai' | 'openai-responses' | 'claude' | 'gemini' | 'openai-compatible';
+export type AIApiType = 'openai' | 'openai-responses' | 'claude' | 'gemini' | 'deepseek' | 'openai-compatible';
 export type AIReasoningEffort = 'none' | 'low' | 'medium' | 'high' | 'xhigh';
 
 export type SecretStatus = 'ok' | 'empty' | 'decrypt_failed';

src/utils/apiUrlBuilder.ts

@@ -44,6 +44,7 @@ export function buildFinalApiUrl(baseUrl: string, apiType: AIApiType): string {
     return buildApiUrl(baseUrl, 'v1beta/models/{model}:generateContent');
   }
 
+  // deepseek uses the same Chat Completions endpoint as openai
   const pathWithVersion = apiType === 'openai-responses' ? 'v1/responses' : 'v1/chat/completions';
   return buildApiUrl(baseUrl, pathWithVersion);
 }