diff --git a/src/components/providers/forms/ProviderForm.tsx b/src/components/providers/forms/ProviderForm.tsx
index e2258e8ff..c05dd38b3 100644
--- a/src/components/providers/forms/ProviderForm.tsx
+++ b/src/components/providers/forms/ProviderForm.tsx
@@ -1139,6 +1139,14 @@ export function ProviderForm({
       preset.templateValues,
     );
 
+    // Sync preset's apiFormat to local state (for Claude providers)
+    if (preset.apiFormat) {
+      setLocalApiFormat(preset.apiFormat);
+    } else {
+      // Reset to default if preset doesn't specify apiFormat
+      setLocalApiFormat("anthropic");
+    }
+
     form.reset({
       name: preset.name,
       websiteUrl: preset.websiteUrl ?? "",
diff --git a/src/config/claudeProviderPresets.ts b/src/config/claudeProviderPresets.ts
index bb6abc479..0b117c4ac 100644
--- a/src/config/claudeProviderPresets.ts
+++ b/src/config/claudeProviderPresets.ts
@@ -43,6 +43,11 @@ export interface ProviderPreset {
   // 图标配置
   icon?: string; // 图标名称
   iconColor?: string; // 图标颜色
+
+  // Claude API 格式（仅 Claude 供应商使用）
+  // - "anthropic" (默认): Anthropic Messages API 格式，直接透传
+  // - "openai_chat": OpenAI Chat Completions 格式，需要格式转换
+  apiFormat?: "anthropic" | "openai_chat";
 }
 
 export const providerPresets: ProviderPreset[] = [