src/app/api/auth/register/route.ts

@@ -128,7 +128,7 @@ export async function POST(request: NextRequest) {
       cchUrl: process.env.CCH_DEFAULT_URL || 'https://claude.leocoder.cn/',
       cchApiKey: null,
       cchApiKeyConfigured: false,
-      defaultModel: 'claude-sonnet-4-5-20250929',
+      defaultModel: 'claude-sonnet-4-20250514',
       defaultTools: ['web_search', 'code_execution', 'web_fetch'],
       theme: 'light',
       language: 'zh-CN',

src/app/api/chat/route.ts

@@ -72,11 +72,6 @@ function isCodexModel(modelId: string): boolean {
   return modelId.startsWith('gpt-') && modelId.includes('codex');
 }
 
-// 规范化 URL（移除末尾斜杠，避免拼接时出现双斜杠）
-function normalizeBaseUrl(url: string): string {
-  return url.replace(/\/+$/, '');
-}
-
 // 默认系统提示词 - 用于生成更详细、更有结构的回复
 const DEFAULT_SYSTEM_PROMPT = `你是一个专业、友好的 AI 助手。请遵循以下规则来回复用户：
 
@@ -287,7 +282,6 @@ export async function POST(request: Request) {
       async start(controller) {
         try {
           const cchUrl = settings.cchUrl || process.env.CCH_DEFAULT_URL || 'https://claude.leocoder.cn/';
-          const apiFormat = (settings.apiFormat as 'claude' | 'openai') || 'claude';
 
           // 获取系统提示词（叠加模式）
           // 1. 始终使用 DEFAULT_SYSTEM_PROMPT 作为基础
@@ -318,41 +312,8 @@ export async function POST(request: Request) {
           let totalInputTokens = 0;
           let totalOutputTokens = 0;
 
-          // 【重要】处理器选择优先级说明：
+          if (isCodex) {
-          // 1. 首先检查 apiFormat === 'openai'：如果用户选择了 "OpenAI 兼容" 格式，
+            // ==================== Codex 模型处理（OpenAI 格式） ====================
-          //    则所有模型（包括 Codex 模型）都统一使用 /v1/chat/completions 端点
-          //    这是因为第三方中转站通常只支持 OpenAI 兼容的 /v1/chat/completions 端点
-          // 2. 然后检查 isCodex：如果是 Claude 原生格式 + Codex 模型，才使用 /v1/responses 端点
-          // 3. 最后是普通的 Claude 原生格式，使用 /v1/messages 端点
-
-          if (apiFormat === 'openai') {
-            // ==================== OpenAI 兼容格式处理 ====================
-            // 当用户选择 "OpenAI 兼容" 时，无论什么模型都走这个分支
-            // 第三方中转站统一使用 /v1/chat/completions 端点
-            console.log('[API/chat] 使用 OpenAI 兼容格式，模型:', useModel, '(isCodex:', isCodex, ')');
-            const result = await handleOpenAICompatibleChat({
-              cchUrl,
-              apiKey: decryptedApiKey,
-              model: useModel,
-              systemPrompt,
-              temperature,
-              historyMessages,
-              message,
-              tools: tools || (conversation.tools as string[]) || [],
-              controller,
-              encoder,
-              images,
-            });
-
-            fullContent = result.fullContent;
-            thinkingContent = result.thinkingContent;
-            totalInputTokens = result.inputTokens;
-            totalOutputTokens = result.outputTokens;
-          } else if (isCodex) {
-            // ==================== Codex 模型处理（使用 Codex Response API） ====================
-            // 仅当使用 Claude 原生格式 + Codex 模型时，才使用 /v1/responses 端点
-            // 这是 CCH 项目特有的 Codex Response API
-            console.log('[API/chat] 使用 Codex Response API (Claude 原生格式 + Codex 模型)');
             const result = await handleCodexChat({
               cchUrl,
               apiKey: decryptedApiKey,
@@ -371,8 +332,7 @@ export async function POST(request: Request) {
             totalInputTokens = result.inputTokens;
             totalOutputTokens = result.outputTokens;
           } else {
-            // ==================== Claude 原生格式处理 ====================
+            // ==================== Claude 模型处理（原有逻辑） ====================
-            console.log('[API/chat] 使用 Claude 原生格式 (/v1/messages)');
             const result = await handleClaudeChat({
               cchUrl,
               apiKey: decryptedApiKey,
@@ -516,11 +476,9 @@ async function handleCodexChat(params: CodexChatParams): Promise<{
     images,
   } = params;
 
-  // 构建 Codex Response API 格式的输入（过滤空内容的消息）
+  // 构建 Codex Response API 格式的输入
   const inputItems: CodexInputItem[] = [
-    ...historyMessages
+    ...historyMessages.map((msg) => ({
-      .filter((msg) => msg.content && msg.content.trim() !== '')
-      .map((msg) => ({
       type: 'message' as const,
       role: msg.role as 'user' | 'assistant',
       content: msg.content,
@@ -598,7 +556,7 @@ async function handleCodexChat(params: CodexChatParams): Promise<{
     }
 
     // 使用 Codex Response API 端点
-    const response = await fetch(`${normalizeBaseUrl(cchUrl)}/v1/responses`, {
+    const response = await fetch(`${cchUrl}/v1/responses`, {
       method: 'POST',
       headers: {
         'Content-Type': 'application/json',
@@ -838,10 +796,8 @@ async function handleClaudeChat(params: ClaudeChatParams): Promise<{
     images,
   } = params;
 
-  // 构建消息历史（过滤空内容的消息）
+  // 构建消息历史
-  const messageHistory: APIMessage[] = historyMessages
+  const messageHistory: APIMessage[] = historyMessages.map((msg) => ({
-    .filter((msg) => msg.content && msg.content.trim() !== '')
-    .map((msg) => ({
     role: msg.role as 'user' | 'assistant',
     content: msg.content,
   }));
@@ -944,7 +900,7 @@ async function handleClaudeChat(params: ClaudeChatParams): Promise<{
       requestBody.temperature = temperature;
     }
 
-    const response = await fetch(`${normalizeBaseUrl(cchUrl)}/v1/messages`, {
+    const response = await fetch(`${cchUrl}/v1/messages`, {
       method: 'POST',
       headers: {
         'Content-Type': 'application/json',
@@ -1170,462 +1126,6 @@ async function handleClaudeChat(params: ClaudeChatParams): Promise<{
   };
 }
 
-// ==================== OpenAI 兼容格式处理函数 ====================
-interface OpenAICompatibleChatParams {
-  cchUrl: string;
-  apiKey: string;
-  model: string;
-  systemPrompt: string;
-  temperature: number;
-  historyMessages: { role: string; content: string }[];
-  message: string;
-  tools: string[];
-  controller: ReadableStreamDefaultController;
-  encoder: TextEncoder;
-  images?: {
-    type: 'image';
-    media_type: string;
-    data: string;
-  }[];
-}
-
-// OpenAI 消息格式
-interface OpenAIMessageContent {
-  type: 'text' | 'image_url';
-  text?: string;
-  image_url?: {
-    url: string;
-  };
-}
-
-interface OpenAICompatibleMessage {
-  role: 'system' | 'user' | 'assistant' | 'tool';
-  content: string | OpenAIMessageContent[] | null;
-  tool_calls?: {
-    id: string;
-    type: 'function';
-    function: {
-      name: string;
-      arguments: string;
-    };
-  }[];
-  tool_call_id?: string;
-}
-
-async function handleOpenAICompatibleChat(params: OpenAICompatibleChatParams): Promise<{
-  fullContent: string;
-  thinkingContent: string;
-  inputTokens: number;
-  outputTokens: number;
-}> {
-  const {
-    cchUrl,
-    apiKey,
-    model,
-    systemPrompt,
-    temperature,
-    historyMessages,
-    message,
-    tools,
-    controller,
-    encoder,
-    images,
-  } = params;
-
-  // 构建 OpenAI 格式的消息历史（过滤空内容的消息）
-  const openaiMessages: OpenAICompatibleMessage[] = [
-    { role: 'system', content: systemPrompt },
-    ...historyMessages
-      .filter((msg) => msg.content && msg.content.trim() !== '')
-      .map((msg) => ({
-        role: msg.role as 'user' | 'assistant',
-        content: msg.content,
-      })),
-  ];
-
-  // 添加当前用户消息（支持多模态）
-  if (images && images.length > 0) {
-    console.log('[handleOpenAICompatibleChat] Building multimodal message with', images.length, 'images');
-    const multimodalContent: OpenAIMessageContent[] = [];
-
-    // 添加图片
-    for (const img of images) {
-      console.log('[handleOpenAICompatibleChat] Adding image:', {
-        type: img.type,
-        media_type: img.media_type,
-        dataLength: img.data?.length || 0,
-      });
-      multimodalContent.push({
-        type: 'image_url',
-        image_url: {
-          url: `data:${img.media_type};base64,${img.data}`,
-        },
-      });
-    }
-
-    // 添加文本
-    if (message) {
-      multimodalContent.push({
-        type: 'text',
-        text: message,
-      });
-    }
-
-    openaiMessages.push({
-      role: 'user',
-      content: multimodalContent,
-    });
-  } else {
-    console.log('[handleOpenAICompatibleChat] No images, using simple text message');
-    openaiMessages.push({
-      role: 'user',
-      content: message,
-    });
-  }
-
-  // 构建 OpenAI 格式的工具定义
-  const openaiTools = buildOpenAIToolDefinitions(tools);
-
-  let fullContent = '';
-  let thinkingContent = ''; // 用于收集 <think> 标签中的思考内容
-  let totalInputTokens = 0;
-  let totalOutputTokens = 0;
-  let loopCount = 0;
-  const maxLoops = 10;
-
-  // 用于处理 <think> 标签的状态变量（跨 chunk 处理）
-  let isInThinkingMode = false;
-  let pendingBuffer = ''; // 用于处理标签可能跨 chunk 的情况
-
-  while (loopCount < maxLoops) {
-    loopCount++;
-
-    // 构建请求体
-    const requestBody: Record<string, unknown> = {
-      model,
-      messages: openaiMessages,
-      stream: true,
-      temperature,
-    };
-
-    if (openaiTools.length > 0) {
-      requestBody.tools = openaiTools;
-    }
-
-    console.log('[handleOpenAICompatibleChat] Sending to OpenAI-compatible API:', {
-      model,
-      messagesCount: openaiMessages.length,
-      url: `${normalizeBaseUrl(cchUrl)}/v1/chat/completions`,
-    });
-
-    const response = await fetch(`${normalizeBaseUrl(cchUrl)}/v1/chat/completions`, {
-      method: 'POST',
-      headers: {
-        'Content-Type': 'application/json',
-        'Authorization': `Bearer ${apiKey}`,
-      },
-      body: JSON.stringify(requestBody),
-    });
-
-    if (!response.ok) {
-      const errorText = await response.text();
-      throw new Error(`OpenAI-compatible API error: ${response.status} - ${errorText}`);
-    }
-
-    const reader = response.body?.getReader();
-    if (!reader) {
-      throw new Error('No response body');
-    }
-
-    // 收集当前轮次的内容
-    let currentTextContent = '';
-    const toolCalls: { id: string; name: string; arguments: string }[] = [];
-    const currentToolCallsMap: Map<number, { id: string; name: string; arguments: string }> = new Map();
-    let stopReason: string | null = null;
-
-    const decoder = new TextDecoder();
-    let buffer = '';
-
-    // 处理流式响应
-    while (true) {
-      const { done, value } = await reader.read();
-      if (done) break;
-
-      buffer += decoder.decode(value, { stream: true });
-      const lines = buffer.split('\n');
-      buffer = lines.pop() || '';
-
-      for (const line of lines) {
-        if (line.startsWith('data: ')) {
-          const data = line.slice(6).trim();
-          if (data === '[DONE]') continue;
-          if (!data) continue;
-
-          try {
-            const event = JSON.parse(data);
-
-            // 处理文本内容（包含 <think> 标签过滤）
-            if (event.choices?.[0]?.delta?.content) {
-              const rawContent = event.choices[0].delta.content;
-
-              // 将新内容追加到待处理缓冲区
-              pendingBuffer += rawContent;
-
-              // 处理缓冲区中的内容
-              while (pendingBuffer.length > 0) {
-                if (isInThinkingMode) {
-                  // 在 thinking 模式中，查找 </think> 结束标签
-                  const endTagIndex = pendingBuffer.indexOf('</think>');
-
-                  if (endTagIndex !== -1) {
-                    // 找到结束标签，提取 thinking 内容
-                    const thinkPart = pendingBuffer.slice(0, endTagIndex);
-                    if (thinkPart) {
-                      thinkingContent += thinkPart;
-                      // 发送 thinking 事件（让前端可以展示折叠的思考内容）
-                      controller.enqueue(encoder.encode(`data: ${JSON.stringify({
-                        type: 'thinking',
-                        content: thinkPart,
-                      })}\n\n`));
-                    }
-                    // 移除已处理的内容和结束标签
-                    pendingBuffer = pendingBuffer.slice(endTagIndex + 8); // 8 = '</think>'.length
-                    isInThinkingMode = false;
-                  } else {
-                    // 没找到结束标签，检查是否可能是部分标签
-                    // 保留最后 7 个字符以防 </think> 被截断（7 = '</think'.length - 1）
-                    if (pendingBuffer.length > 7) {
-                      const safePart = pendingBuffer.slice(0, -7);
-                      const keepPart = pendingBuffer.slice(-7);
-
-                      if (safePart) {
-                        thinkingContent += safePart;
-                        controller.enqueue(encoder.encode(`data: ${JSON.stringify({
-                          type: 'thinking',
-                          content: safePart,
-                        })}\n\n`));
-                      }
-                      pendingBuffer = keepPart;
-                    }
-                    // 等待更多数据
-                    break;
-                  }
-                } else {
-                  // 不在 thinking 模式，查找 <think> 开始标签
-                  const startTagIndex = pendingBuffer.indexOf('<think>');
-
-                  if (startTagIndex !== -1) {
-                    // 找到开始标签，先输出标签前的普通文本
-                    const textPart = pendingBuffer.slice(0, startTagIndex);
-                    if (textPart) {
-                      currentTextContent += textPart;
-                      fullContent += textPart;
-                      controller.enqueue(encoder.encode(`data: ${JSON.stringify({
-                        type: 'text',
-                        content: textPart,
-                      })}\n\n`));
-                    }
-                    // 移除已处理的内容和开始标签
-                    pendingBuffer = pendingBuffer.slice(startTagIndex + 7); // 7 = '<think>'.length
-                    isInThinkingMode = true;
-                  } else {
-                    // 没找到开始标签，检查是否可能是部分标签
-                    // 保留最后 6 个字符以防 <think> 被截断（6 = '<think'.length - 1）
-                    const potentialTagStart = pendingBuffer.lastIndexOf('<');
-
-                    if (potentialTagStart !== -1 && potentialTagStart > pendingBuffer.length - 7) {
-                      // 可能是部分的 <think> 标签，保留这部分
-                      const safePart = pendingBuffer.slice(0, potentialTagStart);
-                      const keepPart = pendingBuffer.slice(potentialTagStart);
-
-                      if (safePart) {
-                        currentTextContent += safePart;
-                        fullContent += safePart;
-                        controller.enqueue(encoder.encode(`data: ${JSON.stringify({
-                          type: 'text',
-                          content: safePart,
-                        })}\n\n`));
-                      }
-                      pendingBuffer = keepPart;
-                      // 等待更多数据
-                      break;
-                    } else {
-                      // 安全输出所有内容
-                      currentTextContent += pendingBuffer;
-                      fullContent += pendingBuffer;
-                      controller.enqueue(encoder.encode(`data: ${JSON.stringify({
-                        type: 'text',
-                        content: pendingBuffer,
-                      })}\n\n`));
-                      pendingBuffer = '';
-                    }
-                  }
-                }
-              }
-            }
-
-            // 处理工具调用
-            if (event.choices?.[0]?.delta?.tool_calls) {
-              for (const toolCall of event.choices[0].delta.tool_calls) {
-                const index = toolCall.index ?? 0;
-
-                if (!currentToolCallsMap.has(index)) {
-                  // 新的工具调用开始
-                  currentToolCallsMap.set(index, {
-                    id: toolCall.id || '',
-                    name: toolCall.function?.name || '',
-                    arguments: '',
-                  });
-
-                  if (toolCall.id) {
-                    controller.enqueue(encoder.encode(`data: ${JSON.stringify({
-                      type: 'tool_use_start',
-                      id: toolCall.id,
-                      name: toolCall.function?.name || '',
-                    })}\n\n`));
-                  }
-                }
-
-                const current = currentToolCallsMap.get(index)!;
-
-                // 更新工具调用信息
-                if (toolCall.id) current.id = toolCall.id;
-                if (toolCall.function?.name) current.name = toolCall.function.name;
-                if (toolCall.function?.arguments) {
-                  current.arguments += toolCall.function.arguments;
-                }
-              }
-            }
-
-            // 处理结束原因
-            if (event.choices?.[0]?.finish_reason) {
-              stopReason = event.choices[0].finish_reason;
-            }
-
-            // 处理 usage 信息
-            if (event.usage) {
-              totalInputTokens = event.usage.prompt_tokens || 0;
-              totalOutputTokens = event.usage.completion_tokens || 0;
-            }
-          } catch (e) {
-            console.error('[handleOpenAICompatibleChat] Parse error:', e, 'Line:', line);
-          }
-        }
-      }
-    }
-
-    // 流结束后，处理可能残留在 pendingBuffer 中的内容
-    if (pendingBuffer.length > 0) {
-      if (isInThinkingMode) {
-        // 如果还在 thinking 模式，说明 </think> 标签没有正常闭合
-        // 将剩余内容作为 thinking 内容处理
-        thinkingContent += pendingBuffer;
-        controller.enqueue(encoder.encode(`data: ${JSON.stringify({
-          type: 'thinking',
-          content: pendingBuffer,
-        })}\n\n`));
-      } else {
-        // 普通文本模式，输出剩余内容
-        currentTextContent += pendingBuffer;
-        fullContent += pendingBuffer;
-        controller.enqueue(encoder.encode(`data: ${JSON.stringify({
-          type: 'text',
-          content: pendingBuffer,
-        })}\n\n`));
-      }
-      pendingBuffer = '';
-    }
-
-    // 收集所有工具调用
-    for (const [, tc] of currentToolCallsMap) {
-      if (tc.id && tc.name) {
-        toolCalls.push(tc);
-        controller.enqueue(encoder.encode(`data: ${JSON.stringify({
-          type: 'tool_use_complete',
-          id: tc.id,
-          name: tc.name,
-          input: JSON.parse(tc.arguments || '{}'),
-        })}\n\n`));
-      }
-    }
-
-    // 检查是否需要执行工具
-    if ((stopReason === 'tool_calls' || toolCalls.length > 0) && toolCalls.length > 0) {
-      // 将助手消息添加到历史
-      const assistantMessage: OpenAICompatibleMessage = {
-        role: 'assistant',
-        content: currentTextContent || null,
-        tool_calls: toolCalls.map((tc) => ({
-          id: tc.id,
-          type: 'function' as const,
-          function: {
-            name: tc.name,
-            arguments: tc.arguments,
-          },
-        })),
-      };
-      openaiMessages.push(assistantMessage);
-
-      // 执行所有工具并收集结果
-      for (const tc of toolCalls) {
-        controller.enqueue(encoder.encode(`data: ${JSON.stringify({
-          type: 'tool_execution_start',
-          id: tc.id,
-          name: tc.name,
-        })}\n\n`));
-
-        // 解析工具参数
-        let toolInput: Record<string, unknown> = {};
-        try {
-          toolInput = JSON.parse(tc.arguments || '{}');
-        } catch {
-          console.error('[handleOpenAICompatibleChat] Failed to parse tool arguments');
-        }
-
-        // 执行工具
-        const result = await executeTool(tc.name, toolInput);
-
-        controller.enqueue(encoder.encode(`data: ${JSON.stringify({
-          type: 'tool_execution_result',
-          id: tc.id,
-          name: tc.name,
-          success: result.success,
-          result: result.displayResult,
-          images: result.images,
-        })}\n\n`));
-
-        // 将工具结果显示给用户
-        const toolDisplayText = `\n\n${result.displayResult}\n\n`;
-        fullContent += toolDisplayText;
-        controller.enqueue(encoder.encode(`data: ${JSON.stringify({
-          type: 'text',
-          content: toolDisplayText,
-        })}\n\n`));
-
-        // 将工具结果添加到消息历史（OpenAI 格式）
-        openaiMessages.push({
-          role: 'tool',
-          content: result.fullResult,
-          tool_call_id: tc.id,
-        });
-      }
-
-      // 继续循环，让 AI 基于工具结果继续回复
-      continue;
-    }
-
-    // 如果没有工具调用，结束循环
-    break;
-  }
-
-  return {
-    fullContent,
-    thinkingContent,
-    inputTokens: totalInputTokens,
-    outputTokens: totalOutputTokens,
-  };
-}
-
 // 构建 Claude 工具定义
 function buildClaudeToolDefinitions(toolIds: string[]) {
   const toolMap: Record<string, object> = {

src/app/api/conversations/route.ts

@@ -57,7 +57,7 @@ export async function POST(request: Request) {
       .values({
         conversationId,
         title: title || '新对话',
-        model: model || 'claude-sonnet-4-5-20250929',
+        model: model || 'claude-sonnet-4-20250514',
         tools: tools || [],
         enableThinking: enableThinking || false,
         userId: user.userId, // 关联当前用户

src/app/api/settings/route.ts

@@ -9,8 +9,7 @@ import { encryptApiKey } from '@/lib/crypto';
 const DEFAULT_SETTINGS = {
   cchUrl: process.env.CCH_DEFAULT_URL || 'https://claude.leocoder.cn/',
   cchApiKeyConfigured: false,
-  apiFormat: 'claude' as 'claude' | 'openai', // API 格式：claude（原生）| openai（兼容）
+  defaultModel: 'claude-sonnet-4-20250514',
-  defaultModel: 'claude-sonnet-4-5-20250929',
   defaultTools: ['web_search', 'code_execution', 'web_fetch'],
   systemPrompt: '',
   temperature: '0.7',
@@ -30,7 +29,6 @@ function formatSettingsResponse(settings: typeof userSettings.$inferSelect | nul
   return {
     cchUrl: settings.cchUrl || DEFAULT_SETTINGS.cchUrl,
     cchApiKeyConfigured: settings.cchApiKeyConfigured || false,
-    apiFormat: (settings.apiFormat as 'claude' | 'openai') || DEFAULT_SETTINGS.apiFormat,
     defaultModel: settings.defaultModel || DEFAULT_SETTINGS.defaultModel,
     defaultTools: settings.defaultTools || DEFAULT_SETTINGS.defaultTools,
     systemPrompt: settings.systemPrompt || '',
@@ -104,7 +102,6 @@ export async function PUT(request: Request) {
     const {
       cchUrl,
       cchApiKey,
-      apiFormat,
       defaultModel,
       defaultTools,
       systemPrompt,
@@ -138,11 +135,6 @@ export async function PUT(request: Request) {
       }
     }
 
-    // API 格式类型
-    if (apiFormat !== undefined) {
-      updateData.apiFormat = apiFormat;
-    }
-
     if (defaultModel !== undefined) {
       updateData.defaultModel = defaultModel;
     }

src/app/assistants/page.tsx

@@ -152,7 +152,7 @@ export default function AssistantsPage() {
 
       // 创建新对话
       const newConversation = await createConversation({
-        model: settings?.defaultModel || 'claude-sonnet-4-5-20250929',
+        model: settings?.defaultModel || 'claude-sonnet-4-20250514',
         tools: settings?.defaultTools || [],
         enableThinking: settings?.enableThinking || false,
         assistantId: assistant.id,

src/app/settings/page.tsx

@@ -52,7 +52,6 @@ export default function SettingsPage() {
   // CCH 配置状态
   const [cchUrl, setCchUrl] = useState('');
   const [cchApiKey, setCchApiKey] = useState('');
-  const [apiFormat, setApiFormat] = useState<'claude' | 'openai'>('claude');
   const [showApiKey, setShowApiKey] = useState(false);
   const [saveStatus, setSaveStatus] = useState<'idle' | 'saving' | 'saved' | 'error'>('idle');
 
@@ -71,7 +70,6 @@ export default function SettingsPage() {
   useEffect(() => {
     if (settings) {
       setCchUrl(settings.cchUrl || '');
-      setApiFormat((settings.apiFormat as 'claude' | 'openai') || 'claude');
       setSystemPrompt(settings.systemPrompt || '');
       setTemperature(settings.temperature || '0.7');
     }
@@ -84,7 +82,6 @@ export default function SettingsPage() {
       const updates: Record<string, string> = {};
       if (cchUrl) updates.cchUrl = cchUrl;
       if (cchApiKey) updates.cchApiKey = cchApiKey;
-      updates.apiFormat = apiFormat;
 
       if (Object.keys(updates).length > 0) {
         await updateSettings(updates);
@@ -336,83 +333,6 @@ export default function SettingsPage() {
                 />
               </SettingsItem>
 
-              {/* API 格式选择 */}
-              <div className="px-5 py-4 border-b border-[var(--color-border-light)]">
-                <div className="text-sm font-medium text-[var(--color-text-primary)] mb-1">
-                  API 格式
-                </div>
-                <div className="text-xs text-[var(--color-text-tertiary)] mb-4">
-                  选择中转站的 API 接口格式
-                </div>
-                <div className="flex gap-3">
-                  {/* Claude 原生选项 */}
-                  <button
-                    type="button"
-                    onClick={() => setApiFormat('claude')}
-                    className={cn(
-                      'flex-1 p-4 rounded-lg border-2 text-left transition-all',
-                      apiFormat === 'claude'
-                        ? 'border-[var(--color-primary)] bg-[var(--color-primary)]/5'
-                        : 'border-[var(--color-border)] hover:border-[var(--color-border-dark)] bg-[var(--color-bg-primary)]'
-                    )}
-                  >
-                    <div className="flex items-center gap-2 mb-1">
-                      <div className={cn(
-                        'w-4 h-4 rounded-full border-2 flex items-center justify-center',
-                        apiFormat === 'claude'
-                          ? 'border-[var(--color-primary)]'
-                          : 'border-[var(--color-border)]'
-                      )}>
-                        {apiFormat === 'claude' && (
-                          <div className="w-2 h-2 rounded-full bg-[var(--color-primary)]" />
-                        )}
-                      </div>
-                      <span className={cn(
-                        'font-medium',
-                        apiFormat === 'claude'
-                          ? 'text-[var(--color-primary)]'
-                          : 'text-[var(--color-text-primary)]'
-                      )}>
-                        Claude 原生
-                      </span>
-                    </div>
-                  </button>
-
-                  {/* OpenAI 兼容选项 */}
-                  <button
-                    type="button"
-                    onClick={() => setApiFormat('openai')}
-                    className={cn(
-                      'flex-1 p-4 rounded-lg border-2 text-left transition-all',
-                      apiFormat === 'openai'
-                        ? 'border-[var(--color-primary)] bg-[var(--color-primary)]/5'
-                        : 'border-[var(--color-border)] hover:border-[var(--color-border-dark)] bg-[var(--color-bg-primary)]'
-                    )}
-                  >
-                    <div className="flex items-center gap-2 mb-1">
-                      <div className={cn(
-                        'w-4 h-4 rounded-full border-2 flex items-center justify-center',
-                        apiFormat === 'openai'
-                          ? 'border-[var(--color-primary)]'
-                          : 'border-[var(--color-border)]'
-                      )}>
-                        {apiFormat === 'openai' && (
-                          <div className="w-2 h-2 rounded-full bg-[var(--color-primary)]" />
-                        )}
-                      </div>
-                      <span className={cn(
-                        'font-medium',
-                        apiFormat === 'openai'
-                          ? 'text-[var(--color-primary)]'
-                          : 'text-[var(--color-text-primary)]'
-                      )}>
-                        OpenAI 兼容
-                      </span>
-                    </div>
-                  </button>
-                </div>
-              </div>
-
               <SettingsItem
                 label="API Key"
                 description={

src/components/features/NewChatModal.tsx

@@ -111,7 +111,7 @@ export function NewChatModal({ isOpen, onClose }: NewChatModalProps) {
     setIsCreating(true);
     try {
       const newConversation = await createConversation({
-        model: settings?.defaultModel || 'claude-sonnet-4-5-20250929',
+        model: settings?.defaultModel || 'claude-sonnet-4-20250514',
         tools: settings?.defaultTools || [],
         enableThinking: settings?.enableThinking || false,
         assistantId: assistant?.id,

src/drizzle/migrations/0008_flat_star_brand.sql

@@ -1 +0,0 @@
-ALTER TABLE "user_settings" ADD COLUMN "api_format" varchar(20) DEFAULT 'claude';

src/drizzle/migrations/meta/_journal.json

@@ -57,13 +57,6 @@
       "when": 1766299055211,
       "tag": "0007_fantastic_molten_man",
       "breakpoints": true
-    },
-    {
-      "idx": 8,
-      "version": "7",
-      "when": 1766314954003,
-      "tag": "0008_flat_star_brand",
-      "breakpoints": true
     }
   ]
 }

src/drizzle/schema.ts

@@ -63,10 +63,8 @@ export const userSettings = pgTable('user_settings', {
   cchUrl: varchar('cch_url', { length: 512 }).notNull().default('http://localhost:13500'),
   cchApiKey: varchar('cch_api_key', { length: 512 }),
   cchApiKeyConfigured: boolean('cch_api_key_configured').default(false),
-  // API 格式类型：claude（原生）| openai（兼容）
-  apiFormat: varchar('api_format', { length: 20 }).default('claude'),
   // 默认设置
-  defaultModel: varchar('default_model', { length: 64 }).default('claude-sonnet-4-5-20250929'),
+  defaultModel: varchar('default_model', { length: 64 }).default('claude-sonnet-4-20250514'),
   defaultTools: jsonb('default_tools').$type<string[]>().default(['web_search', 'code_execution', 'web_fetch']),
   // AI 行为设置
   systemPrompt: text('system_prompt'), // 系统提示词

src/hooks/useSettings.ts

@@ -5,7 +5,6 @@ import { useState, useEffect, useCallback } from 'react';
 export interface Settings {
   cchUrl: string;
   cchApiKeyConfigured: boolean;
-  apiFormat: 'claude' | 'openai';
   defaultModel: string;
   defaultTools: string[];
   systemPrompt: string;
@@ -51,8 +50,7 @@ export interface Model {
 const defaultSettings: Settings = {
   cchUrl: 'http://localhost:13500',
   cchApiKeyConfigured: false,
-  apiFormat: 'claude',
+  defaultModel: 'claude-sonnet-4-20250514',
-  defaultModel: 'claude-sonnet-4-5-20250929',
   defaultTools: ['web_search', 'code_execution', 'web_fetch'],
   systemPrompt: '',
   temperature: '0.7',