fix(claude): add gemini_chat format for Gemini-compatible endpoints (#1899)

src-tauri/src/provider.rs

@@ -268,6 +268,7 @@ pub struct ProviderMeta {
     /// Claude API 格式（仅 Claude 供应商使用）
     /// - "anthropic": 原生 Anthropic Messages API，直接透传
     /// - "openai_chat": OpenAI Chat Completions 格式，需要转换
+    /// - "gemini_chat": Gemini Chat 兼容格式，需要转换，但不注入 prompt_cache_key
     /// - "openai_responses": OpenAI Responses API 格式，需要转换
     #[serde(rename = "apiFormat", skip_serializing_if = "Option::is_none")]
     pub api_format: Option<String>,
@@ -282,9 +283,9 @@ pub struct ProviderMeta {
     /// 是否将 base_url 视为完整 API 端点（不拼接 endpoint 路径）
     #[serde(rename = "isFullUrl", skip_serializing_if = "Option::is_none")]
     pub is_full_url: Option<bool>,
-    /// Prompt cache key for OpenAI-compatible endpoints.
+    /// Prompt cache key for OpenAI-compatible endpoints that accept it.
     /// When set, injected into converted requests to improve cache hit rate.
-    /// If not set, provider ID is used automatically during format conversion.
+    /// If not set, provider ID is used automatically during openai_chat/openai_responses conversion.
     #[serde(rename = "promptCacheKey", skip_serializing_if = "Option::is_none")]
     pub prompt_cache_key: Option<String>,
     /// 累加模式应用中，该 provider 是否已写入 live config。

src-tauri/src/proxy/forwarder.rs

@@ -1544,7 +1544,7 @@ fn rewrite_claude_transform_endpoint(
 
     let target_path = if is_copilot && api_format == "openai_responses" {
         "/v1/responses"
-    } else if is_copilot {
+    } else if is_copilot || api_format == "gemini_chat" {
         "/chat/completions"
     } else if api_format == "openai_responses" {
         "/v1/responses"
@@ -1694,6 +1694,18 @@ mod tests {
         assert_eq!(passthrough_query.as_deref(), Some("foo=bar"));
     }
 
+    #[test]
+    fn rewrite_claude_transform_endpoint_uses_gemini_chat_path() {
+        let (endpoint, passthrough_query) = rewrite_claude_transform_endpoint(
+            "/v1/messages?beta=true&foo=bar",
+            "gemini_chat",
+            false,
+        );
+
+        assert_eq!(endpoint, "/chat/completions?foo=bar");
+        assert_eq!(passthrough_query.as_deref(), Some("foo=bar"));
+    }
+
     #[test]
     fn rewrite_claude_transform_endpoint_strips_beta_for_responses() {
         let (endpoint, passthrough_query) = rewrite_claude_transform_endpoint(

src-tauri/src/proxy/providers/claude.rs

@@ -5,6 +5,7 @@
 //! ## API 格式
 //! - **anthropic** (默认): Anthropic Messages API 格式，直接透传
 //! - **openai_chat**: OpenAI Chat Completions 格式，需要 Anthropic ↔ OpenAI 转换
+//! - **gemini_chat**: Gemini Chat 兼容格式，走 `/chat/completions`，且不注入 `prompt_cache_key`
 //! - **openai_responses**: OpenAI Responses API 格式，需要 Anthropic ↔ Responses 转换
 //!
 //! ## 认证模式
@@ -27,6 +28,7 @@ pub fn get_claude_api_format(provider: &Provider) -> &'static str {
         if let Some(api_format) = meta.api_format.as_deref() {
             return match api_format {
                 "openai_chat" => "openai_chat",
+                "gemini_chat" => "gemini_chat",
                 "openai_responses" => "openai_responses",
                 _ => "anthropic",
             };
@@ -41,6 +43,7 @@ pub fn get_claude_api_format(provider: &Provider) -> &'static str {
     {
         return match api_format {
             "openai_chat" => "openai_chat",
+            "gemini_chat" => "gemini_chat",
             "openai_responses" => "openai_responses",
             _ => "anthropic",
         };
@@ -66,7 +69,10 @@ pub fn get_claude_api_format(provider: &Provider) -> &'static str {
 }
 
 pub fn claude_api_format_needs_transform(api_format: &str) -> bool {
-    matches!(api_format, "openai_chat" | "openai_responses")
+    matches!(
+        api_format,
+        "openai_chat" | "gemini_chat" | "openai_responses"
+    )
 }
 
 pub fn transform_claude_request_for_api_format(
@@ -85,6 +91,7 @@ pub fn transform_claude_request_for_api_format(
             super::transform_responses::anthropic_to_responses(body, Some(cache_key))
         }
         "openai_chat" => super::transform::anthropic_to_openai(body, Some(cache_key)),
+        "gemini_chat" => super::transform::anthropic_to_openai(body, None),
         _ => Ok(body),
     }
 }
@@ -155,6 +162,7 @@ impl ClaudeAdapter {
     /// 从 provider.meta.api_format 读取格式设置：
     /// - "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
+    /// - "gemini_chat": Gemini Chat 兼容格式，需要格式转换，但不注入 prompt_cache_key
     /// - "openai_responses": OpenAI Responses API 格式，需要格式转换
     fn get_api_format(&self, provider: &Provider) -> &'static str {
         get_claude_api_format(provider)
@@ -415,10 +423,11 @@ impl ProviderAdapter for ClaudeAdapter {
         // 根据 api_format 配置决定是否需要格式转换
         // - "anthropic" (默认): 直接透传，无需转换
         // - "openai_chat": 需要 Anthropic ↔ OpenAI Chat Completions 格式转换
+        // - "gemini_chat": 需要 Anthropic ↔ Gemini Chat 兼容格式转换（不注入 prompt_cache_key）
         // - "openai_responses": 需要 Anthropic ↔ OpenAI Responses API 格式转换
         matches!(
             self.get_api_format(provider),
-            "openai_chat" | "openai_responses"
+            "openai_chat" | "gemini_chat" | "openai_responses"
         )
     }
 
@@ -726,6 +735,20 @@ mod tests {
         );
         assert!(adapter.needs_transform(&openai_chat_provider));
 
+        // Gemini Chat format in meta: needs transform
+        let gemini_chat_provider = create_provider_with_meta(
+            json!({
+                "env": {
+                    "ANTHROPIC_BASE_URL": "https://generativelanguage.googleapis.com/v1beta/openai"
+                }
+            }),
+            ProviderMeta {
+                api_format: Some("gemini_chat".to_string()),
+                ..Default::default()
+            },
+        );
+        assert!(adapter.needs_transform(&gemini_chat_provider));
+
         // OpenAI Responses format in meta: needs transform
         let openai_responses_provider = create_provider_with_meta(
             json!({
@@ -854,4 +877,31 @@ mod tests {
         assert!(transformed.get("input").is_some());
         assert!(transformed.get("max_output_tokens").is_some());
     }
+
+    #[test]
+    fn test_transform_claude_request_for_api_format_gemini_chat_omits_prompt_cache_key() {
+        let provider = create_provider_with_meta(
+            json!({
+                "env": {
+                    "ANTHROPIC_BASE_URL": "https://generativelanguage.googleapis.com/v1beta/openai"
+                }
+            }),
+            ProviderMeta {
+                prompt_cache_key: Some("custom-cache-key".to_string()),
+                ..Default::default()
+            },
+        );
+        let body = json!({
+            "model": "gemini-2.5-flash",
+            "messages": [{ "role": "user", "content": "hello" }],
+            "max_tokens": 128
+        });
+
+        let transformed =
+            transform_claude_request_for_api_format(body, &provider, "gemini_chat").unwrap();
+
+        assert_eq!(transformed["model"], "gemini-2.5-flash");
+        assert!(transformed.get("messages").is_some());
+        assert!(transformed.get("prompt_cache_key").is_none());
+    }
 }

src-tauri/src/services/stream_check.rs

@@ -309,6 +309,7 @@ impl StreamCheckService {
     /// 根据供应商的 api_format 选择请求格式：
     /// - "anthropic" (默认): Anthropic Messages API (/v1/messages)
     /// - "openai_chat": OpenAI Chat Completions API (/v1/chat/completions)
+    /// - "gemini_chat": Gemini Chat 兼容 API (/chat/completions, 不注入 prompt_cache_key)
     #[allow(clippy::too_many_arguments)]
     async fn check_claude_stream(
         client: &Client,
@@ -344,6 +345,7 @@ impl StreamCheckService {
             .and_then(|meta| meta.is_full_url)
             .unwrap_or(false);
         let is_openai_chat = effective_api_format == "openai_chat";
+        let is_gemini_chat = effective_api_format == "gemini_chat";
         let is_openai_responses = effective_api_format == "openai_responses";
         let url =
             Self::resolve_claude_stream_url(base, auth.strategy, effective_api_format, is_full_url);
@@ -360,6 +362,9 @@ impl StreamCheckService {
         let body = if is_openai_responses {
             anthropic_to_responses(anthropic_body, Some(&provider.id))
                 .map_err(|e| AppError::Message(format!("Failed to build test request: {e}")))?
+        } else if is_gemini_chat {
+            anthropic_to_openai(anthropic_body, None)
+                .map_err(|e| AppError::Message(format!("Failed to build test request: {e}")))?
         } else if is_openai_chat {
             anthropic_to_openai(anthropic_body, Some(&provider.id))
                 .map_err(|e| AppError::Message(format!("Failed to build test request: {e}")))?
@@ -395,7 +400,7 @@ impl StreamCheckService {
                 .header("x-vscode-user-agent-library-version", "electron-fetch")
                 .header("x-request-id", &request_id)
                 .header("x-agent-task-id", &request_id);
-        } else if is_openai_chat || is_openai_responses {
+        } else if is_openai_chat || is_gemini_chat || is_openai_responses {
             // OpenAI-compatible targets: Bearer auth + SSE headers only
             request_builder = request_builder
                 .header("authorization", format!("Bearer {}", auth.api_key))
@@ -761,7 +766,7 @@ impl StreamCheckService {
 
         if is_github_copilot && api_format == "openai_responses" {
             format!("{base}/v1/responses")
-        } else if is_github_copilot {
+        } else if is_github_copilot || api_format == "gemini_chat" {
             format!("{base}/chat/completions")
         } else if api_format == "openai_responses" {
             if base.ends_with("/v1") {
@@ -955,6 +960,21 @@ mod tests {
         assert_eq!(url, "https://example.com/v1/chat/completions");
     }
 
+    #[test]
+    fn test_resolve_claude_stream_url_for_gemini_chat() {
+        let url = StreamCheckService::resolve_claude_stream_url(
+            "https://generativelanguage.googleapis.com/v1beta/openai",
+            AuthStrategy::Bearer,
+            "gemini_chat",
+            false,
+        );
+
+        assert_eq!(
+            url,
+            "https://generativelanguage.googleapis.com/v1beta/openai/chat/completions"
+        );
+    }
+
     #[test]
     fn test_resolve_claude_stream_url_for_openai_responses() {
         let url = StreamCheckService::resolve_claude_stream_url(

src/components/providers/forms/ClaudeFormFields.tsx

@@ -416,9 +416,11 @@ export function ClaudeFormFields({
           hint={
             apiFormat === "openai_responses"
               ? t("providerForm.apiHintResponses")
-              : apiFormat === "openai_chat"
-                ? t("providerForm.apiHintOAI")
-                : t("providerForm.apiHint")
+              : apiFormat === "gemini_chat"
+                ? t("providerForm.apiHintGeminiChat")
+                : apiFormat === "openai_chat"
+                  ? t("providerForm.apiHintOAI")
+                  : t("providerForm.apiHint")
           }
           onManageClick={() => onEndpointModalToggle(true)}
           showFullUrlToggle={true}
@@ -488,6 +490,11 @@ export function ClaudeFormFields({
                         defaultValue: "OpenAI Chat Completions (需转换)",
                       })}
                     </SelectItem>
+                    <SelectItem value="gemini_chat">
+                      {t("providerForm.apiFormatGeminiChat", {
+                        defaultValue: "Gemini Chat Compatible (需开启代理)",
+                      })}
+                    </SelectItem>
                     <SelectItem value="openai_responses">
                       {t("providerForm.apiFormatOpenAIResponses", {
                         defaultValue: "OpenAI Responses API (需转换)",

src/config/claudeProviderPresets.ts

@@ -48,8 +48,9 @@ export interface ProviderPreset {
   // 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
+  // - "gemini_chat": Gemini Chat 兼容格式，需要格式转换，但不注入 prompt_cache_key
   // - "openai_responses": OpenAI Responses API 格式，需要格式转换
-  apiFormat?: "anthropic" | "openai_chat" | "openai_responses";
+  apiFormat?: "anthropic" | "openai_chat" | "gemini_chat" | "openai_responses";
 
   // 供应商类型标识（用于特殊供应商检测）
   // - "github_copilot": GitHub Copilot 供应商（需要 OAuth 认证）

src/hooks/useProviderActions.ts

@@ -158,6 +158,13 @@ export function useProviderActions(activeApp: AppId, isProxyRunning?: boolean) {
           proxyRequiredReason = t("notifications.proxyReasonOpenAIChat", {
             defaultValue: "使用 OpenAI Chat 接口格式",
           });
+        } else if (
+          provider.meta?.apiFormat === "gemini_chat" &&
+          activeApp === "claude"
+        ) {
+          proxyRequiredReason = t("notifications.proxyReasonGeminiChat", {
+            defaultValue: "使用 Gemini Chat 兼容接口格式",
+          });
         } else if (
           provider.meta?.apiFormat === "openai_responses" &&
           activeApp === "claude"
@@ -207,6 +214,7 @@ export function useProviderActions(activeApp: AppId, isProxyRunning?: boolean) {
           provider.category !== "official" &&
           (isCopilotProvider ||
             provider.meta?.apiFormat === "openai_chat" ||
+            provider.meta?.apiFormat === "gemini_chat" ||
             provider.meta?.apiFormat === "openai_responses")
         ) {
           // OpenAI format provider: show proxy hint (skip if warning already shown)

src/i18n/locales/en.json

@@ -177,6 +177,7 @@
     "proxyRequiredForSwitch": "This provider {{reason}}, requires the proxy service to work properly. Start the proxy first.",
     "proxyReasonCopilot": "uses GitHub Copilot as a Claude provider",
     "proxyReasonOpenAIChat": "uses OpenAI Chat API format",
+    "proxyReasonGeminiChat": "uses Gemini Chat compatible API format",
     "proxyReasonOpenAIResponses": "uses OpenAI Responses API format",
     "proxyReasonFullUrl": "has full URL connection mode enabled",
     "openAIFormatHint": "This provider uses OpenAI-compatible format and requires the proxy service to be enabled",
@@ -746,6 +747,7 @@
     "modelHint": "💡 Leave blank to use provider's default model",
     "apiHint": "💡 Fill in Claude API compatible service endpoint, avoid trailing slash",
     "apiHintOAI": "💡 Fill in OpenAI Chat Completions compatible service endpoint, avoid trailing slash",
+    "apiHintGeminiChat": "💡 Fill in a Gemini Chat compatible service endpoint. For Google AI Studio, use the /v1beta/openai root and avoid a trailing slash",
     "codexApiHint": "💡 Fill in service endpoint compatible with OpenAI Response format",
     "fillSupplierName": "Please fill in provider name",
     "fillConfigContent": "Please fill in configuration content",
@@ -770,6 +772,7 @@
     "fullUrlHint": "💡 Enter the full request URL. This mode requires the proxy to be enabled, and the proxy will use the URL as-is without appending a path",
     "apiFormatAnthropic": "Anthropic Messages (Native)",
     "apiFormatOpenAIChat": "OpenAI Chat Completions (Requires proxy)",
+    "apiFormatGeminiChat": "Gemini Chat Compatible (Requires proxy)",
     "apiFormatOpenAIResponses": "OpenAI Responses API (Requires proxy)",
     "authField": "Auth Field",
     "authFieldAuthToken": "ANTHROPIC_AUTH_TOKEN (Default)",

src/i18n/locales/ja.json

@@ -177,6 +177,7 @@
     "proxyRequiredForSwitch": "このプロバイダーは{{reason}}、プロキシサービスが必要です。先にプロキシを起動してください",
     "proxyReasonCopilot": "GitHub Copilot を Claude プロバイダーとして使用しており",
     "proxyReasonOpenAIChat": "OpenAI Chat API フォーマットを使用しており",
+    "proxyReasonGeminiChat": "Gemini Chat 互換 API フォーマットを使用しており",
     "proxyReasonOpenAIResponses": "OpenAI Responses API フォーマットを使用しており",
     "proxyReasonFullUrl": "完全 URL 接続モードが有効になっており",
     "openAIFormatHint": "このプロバイダーは OpenAI 互換フォーマットを使用しており、プロキシサービスの有効化が必要です",
@@ -746,6 +747,7 @@
     "modelHint": "💡 空欄ならプロバイダーのデフォルトモデルを使用します",
     "apiHint": "💡 Claude API 互換サービスのエンドポイントを入力してください。末尾にスラッシュを付けないでください",
     "apiHintOAI": "💡 OpenAI Chat Completions 互換サービスのエンドポイントを入力してください。末尾にスラッシュを付けないでください",
+    "apiHintGeminiChat": "💡 Gemini Chat 互換サービスのエンドポイントを入力してください。Google AI Studio の場合は /v1beta/openai ルートを使い、末尾にスラッシュを付けないでください",
     "codexApiHint": "💡 OpenAI Response 互換のサービスエンドポイントを入力してください",
     "fillSupplierName": "プロバイダー名を入力してください",
     "fillConfigContent": "設定内容を入力してください",
@@ -770,6 +772,7 @@
     "fullUrlHint": "💡 完全なリクエスト URL を入力してください。このモードはプロキシを有効にして使用する必要があり、プロキシはこの URL をそのまま使用し、パスを追加しません",
     "apiFormatAnthropic": "Anthropic Messages（ネイティブ）",
     "apiFormatOpenAIChat": "OpenAI Chat Completions（プロキシが必要）",
+    "apiFormatGeminiChat": "Gemini Chat Compatible（プロキシが必要）",
     "apiFormatOpenAIResponses": "OpenAI Responses API（プロキシが必要）",
     "authField": "認証フィールド",
     "authFieldAuthToken": "ANTHROPIC_AUTH_TOKEN（デフォルト）",

src/i18n/locales/zh.json

@@ -177,6 +177,7 @@
     "proxyRequiredForSwitch": "此供应商{{reason}}，需要代理服务才能正常使用，请先启动代理",
     "proxyReasonCopilot": "使用 GitHub Copilot 作为 Claude 供应商",
     "proxyReasonOpenAIChat": "使用 OpenAI Chat 接口格式",
+    "proxyReasonGeminiChat": "使用 Gemini Chat 兼容接口格式",
     "proxyReasonOpenAIResponses": "使用 OpenAI Responses 接口格式",
     "proxyReasonFullUrl": "开启了完整 URL 连接模式",
     "openAIFormatHint": "此供应商使用 OpenAI 兼容格式，需要开启代理服务才能正常使用",
@@ -746,6 +747,7 @@
     "modelHint": "💡 留空将使用供应商的默认模型",
     "apiHint": "💡 填写兼容 Claude API 的服务端点地址，不要以斜杠结尾",
     "apiHintOAI": "💡 填写兼容 OpenAI Chat Completions 的服务端点地址，不要以斜杠结尾",
+    "apiHintGeminiChat": "💡 填写兼容 Gemini Chat 的服务端点地址，例如 Google AI Studio 可填写到 /v1beta/openai，且不要以斜杠结尾",
     "codexApiHint": "💡 填写兼容 OpenAI Response 格式的服务端点地址",
     "fillSupplierName": "请填写供应商名称",
     "fillConfigContent": "请填写配置内容",
@@ -770,6 +772,7 @@
     "fullUrlHint": "💡 请填写完整请求 URL，并且必须开启代理后使用；代理将直接使用此 URL，不拼接路径",
     "apiFormatAnthropic": "Anthropic Messages (原生)",
     "apiFormatOpenAIChat": "OpenAI Chat Completions (需开启代理)",
+    "apiFormatGeminiChat": "Gemini Chat Compatible (需开启代理)",
     "apiFormatOpenAIResponses": "OpenAI Responses API (需开启代理)",
     "authField": "认证字段",
     "authFieldAuthToken": "ANTHROPIC_AUTH_TOKEN（默认）",

src/types.ts

@@ -158,15 +158,16 @@ export interface ProviderMeta {
   // Claude API 格式（仅 Claude 供应商使用）
   // - "anthropic": 原生 Anthropic Messages API 格式，直接透传
   // - "openai_chat": OpenAI Chat Completions 格式，需要格式转换
+  // - "gemini_chat": Gemini Chat 兼容格式，需要格式转换，但不注入 prompt_cache_key
   // - "openai_responses": OpenAI Responses API 格式，需要格式转换
-  apiFormat?: "anthropic" | "openai_chat" | "openai_responses";
+  apiFormat?: "anthropic" | "openai_chat" | "gemini_chat" | "openai_responses";
   // 通用认证绑定
   authBinding?: AuthBinding;
   // Claude 认证字段名
   apiKeyField?: ClaudeApiKeyField;
   // 是否将 base_url 视为完整 API 端点（代理直接使用此 URL，不拼接路径）
   isFullUrl?: boolean;
-  // Prompt cache key for OpenAI-compatible endpoints (improves cache hit rate)
+  // Prompt cache key for compatible endpoints that accept it (not used by gemini_chat)
   promptCacheKey?: string;
   // 供应商类型（用于识别 Copilot 等特殊供应商）
   providerType?: string;
@@ -180,8 +181,13 @@ export type SkillSyncMethod = "auto" | "symlink" | "copy";
 // Claude API 格式类型
 // - "anthropic": 原生 Anthropic Messages API 格式，直接透传
 // - "openai_chat": OpenAI Chat Completions 格式，需要格式转换
+// - "gemini_chat": Gemini Chat 兼容格式，需要格式转换，但不注入 prompt_cache_key
 // - "openai_responses": OpenAI Responses API 格式，需要格式转换
-export type ClaudeApiFormat = "anthropic" | "openai_chat" | "openai_responses";
+export type ClaudeApiFormat =
+  | "anthropic"
+  | "openai_chat"
+  | "gemini_chat"
+  | "openai_responses";
 
 // Claude 认证字段类型
 export type ClaudeApiKeyField = "ANTHROPIC_AUTH_TOKEN" | "ANTHROPIC_API_KEY";