diff --git a/src-tauri/src/proxy/forwarder.rs b/src-tauri/src/proxy/forwarder.rs
index 2c741b8a6..6ea8e91b5 100644
--- a/src-tauri/src/proxy/forwarder.rs
+++ b/src-tauri/src/proxy/forwarder.rs
@@ -561,15 +561,17 @@ impl RequestForwarder {
         // 检查是否需要格式转换
         let needs_transform = adapter.needs_transform(provider);
 
-        let effective_endpoint =
-            if needs_transform && adapter.name() == "Claude" && endpoint == "/v1/messages" {
-                "/v1/chat/completions"
-            } else {
-                endpoint
-            };
+        let effective_endpoint = if needs_transform
+            && adapter.name() == "Claude"
+            && endpoint.starts_with("/v1/messages")
+        {
+            endpoint.replacen("/v1/messages", "/v1/chat/completions", 1)
+        } else {
+            endpoint.to_string()
+        };
 
         // 使用适配器构建 URL
-        let url = adapter.build_url(&base_url, effective_endpoint);
+        let url = adapter.build_url(&base_url, &effective_endpoint);
 
         // 应用模型映射（独立于格式转换）
         let (mapped_body, _original_model, _mapped_model) =
diff --git a/src-tauri/src/proxy/handlers.rs b/src-tauri/src/proxy/handlers.rs
index 644ef353c..a3e83e340 100644
--- a/src-tauri/src/proxy/handlers.rs
+++ b/src-tauri/src/proxy/handlers.rs
@@ -56,6 +56,7 @@ pub async fn get_status(State(state): State<ProxyState>) -> Result<Json<ProxySta
 /// - 现在 OpenRouter 已推出 Claude Code 兼容接口，默认不再启用该转换（逻辑保留以备回退）
 pub async fn handle_messages(
     State(state): State<ProxyState>,
+    uri: axum::http::Uri,
     headers: axum::http::HeaderMap,
     Json(body): Json<Value>,
 ) -> Result<axum::response::Response, ProxyError> {
@@ -67,12 +68,18 @@ pub async fn handle_messages(
         .and_then(|s| s.as_bool())
         .unwrap_or(false);
 
+    // 透传客户端 query 参数（例如 ?beta=true），路径统一为 /v1/messages
+    let endpoint = uri
+        .query()
+        .map(|q| format!("/v1/messages?{q}"))
+        .unwrap_or_else(|| "/v1/messages".to_string());
+
     // 转发请求
     let forwarder = ctx.create_forwarder(&state);
     let result = match forwarder
         .forward_with_retry(
             &AppType::Claude,
-            "/v1/messages",
+            &endpoint,
             body.clone(),
             headers,
             ctx.get_providers(),
diff --git a/src-tauri/src/proxy/providers/claude.rs b/src-tauri/src/proxy/providers/claude.rs
index 6d43c4687..397b5a45b 100644
--- a/src-tauri/src/proxy/providers/claude.rs
+++ b/src-tauri/src/proxy/providers/claude.rs
@@ -280,17 +280,7 @@ impl ProviderAdapter for ClaudeAdapter {
         // 去除重复的 /v1/v1（可能由 base_url 与 endpoint 都带版本导致）
         let base = dedup_v1_v1_boundary_safe(base);
 
-        // 为 Claude Messages 端点添加 ?beta=true 参数
-        // 这是某些上游服务（如 DuckCoding）验证请求来源的关键参数
-        // 仅对 /v1/messages 生效，不对 /v1/chat/completions 生效
-        let needs_beta =
-            base.contains("/v1/messages") && !base.contains('?') && !suffix.starts_with('?');
-
-        if needs_beta {
-            format!("{base}?beta=true{suffix}")
-        } else {
-            format!("{base}{suffix}")
-        }
+        format!("{base}{suffix}")
     }
 
     fn add_auth_headers(&self, request: RequestBuilder, auth: &AuthInfo) -> RequestBuilder {
@@ -502,23 +492,21 @@ mod tests {
     #[test]
     fn test_build_url_anthropic() {
         let adapter = ClaudeAdapter::new();
-        // /v1/messages 端点会自动添加 ?beta=true 参数
         let url = adapter.build_url("https://api.anthropic.com", "/v1/messages");
-        assert_eq!(url, "https://api.anthropic.com/v1/messages?beta=true");
+        assert_eq!(url, "https://api.anthropic.com/v1/messages");
     }
 
     #[test]
     fn test_build_url_openrouter() {
         let adapter = ClaudeAdapter::new();
-        // /v1/messages 端点会自动添加 ?beta=true 参数
         let url = adapter.build_url("https://openrouter.ai/api", "/v1/messages");
-        assert_eq!(url, "https://openrouter.ai/api/v1/messages?beta=true");
+        assert_eq!(url, "https://openrouter.ai/api/v1/messages");
     }
 
     #[test]
     fn test_build_url_no_beta_for_other_endpoints() {
         let adapter = ClaudeAdapter::new();
-        // 非 /v1/messages 端点不添加 ?beta=true
+        // 非 /v1/messages 端点保持原样
         let url = adapter.build_url("https://api.anthropic.com", "/v1/complete");
         assert_eq!(url, "https://api.anthropic.com/v1/complete");
     }
@@ -536,7 +524,7 @@ mod tests {
         let adapter = ClaudeAdapter::new();
         // base_url 已包含完整路径 /v1/messages，不再追加
         let url = adapter.build_url("https://example.com/api/v1/messages", "/v1/messages");
-        assert_eq!(url, "https://example.com/api/v1/messages?beta=true");
+        assert_eq!(url, "https://example.com/api/v1/messages");
     }
 
     #[test]
@@ -574,14 +562,11 @@ mod tests {
             "https://integrate.api.nvidia.com/v1",
             "/v1/chat/completions",
         );
-        assert_eq!(
-            url,
-            "https://integrate.api.nvidia.com/v1/chat/completions"
-        );
+        assert_eq!(url, "https://integrate.api.nvidia.com/v1/chat/completions");
 
         // 另一个场景：/v1 + /v1/messages
         let url2 = adapter.build_url("https://api.example.com/v1", "/v1/messages");
-        assert_eq!(url2, "https://api.example.com/v1/messages?beta=true");
+        assert_eq!(url2, "https://api.example.com/v1/messages");
     }
 
     #[test]
diff --git a/src-tauri/src/proxy/url_builder.rs b/src-tauri/src/proxy/url_builder.rs
index 42ff13ff3..5bfa578df 100644
--- a/src-tauri/src/proxy/url_builder.rs
+++ b/src-tauri/src/proxy/url_builder.rs
@@ -144,7 +144,7 @@ fn build_runtime_like_url(
     is_proxy: bool,
 ) -> String {
     match app_type {
-        // Claude 代理预览需要展示运行时附加参数（如 ?beta=true）
+        // Claude 代理预览需要展示与运行时一致的 URL 归一化结果
         AppType::Claude if is_proxy => ClaudeAdapter::new().build_url(base_url, endpoint),
         // Codex/OpenCode 预览复用运行时 /v1 归一化规则
         AppType::Codex | AppType::OpenCode => CodexAdapter::new().build_url(base_url, endpoint),
@@ -226,7 +226,7 @@ pub fn check_proxy_requirement(
         }
     }
 
-    // 如果直连地址和代理地址路径不同，需要代理（忽略查询参数差异，如 Claude ?beta=true）
+    // 如果直连地址和代理地址路径不同，需要代理（忽略查询参数差异）
     let (direct_base, _) = split_url_suffix(&preview.direct_url);
     let (proxy_base, _) = split_url_suffix(&preview.proxy_url);
     if direct_base != proxy_base {
@@ -248,10 +248,7 @@ mod tests {
             Some("anthropic"),
         );
         assert_eq!(preview.direct_url, "https://api.example.com/v1/messages");
-        assert_eq!(
-            preview.proxy_url,
-            "https://api.example.com/v1/messages?beta=true"
-        );
+        assert_eq!(preview.proxy_url, "https://api.example.com/v1/messages");
         assert!(!preview.is_full_url);
     }
 
@@ -282,10 +279,7 @@ mod tests {
             preview.direct_url,
             "https://api.example.com/v1/messages/v1/messages"
         );
-        assert_eq!(
-            preview.proxy_url,
-            "https://api.example.com/v1/messages?beta=true"
-        );
+        assert_eq!(preview.proxy_url, "https://api.example.com/v1/messages");
         assert!(preview.is_full_url);
     }
 
@@ -397,11 +391,8 @@ mod tests {
             Some("anthropic"),
         );
         assert_eq!(preview.direct_url, "https://api.example.com/v1/v1/messages");
-        // 代理地址按运行时规则构建，会去重并附加 ?beta=true
-        assert_eq!(
-            preview.proxy_url,
-            "https://api.example.com/v1/messages?beta=true"
-        );
+        // 代理地址按运行时规则构建，会进行路径去重
+        assert_eq!(preview.proxy_url, "https://api.example.com/v1/messages");
     }
 
     #[test]
@@ -431,7 +422,7 @@ mod tests {
         );
         assert_eq!(
             preview.proxy_url,
-            "https://api.example.com/v1/messages?beta=true#frag"
+            "https://api.example.com/v1/messages#frag"
         );
         assert!(preview.is_full_url);
     }
diff --git a/src-tauri/src/services/stream_check.rs b/src-tauri/src/services/stream_check.rs
index c7afaa55e..ce5040abe 100644
--- a/src-tauri/src/services/stream_check.rs
+++ b/src-tauri/src/services/stream_check.rs
@@ -285,11 +285,11 @@ impl StreamCheckService {
         timeout: std::time::Duration,
     ) -> Result<(u16, String), AppError> {
         let base = base_url.trim_end_matches('/');
-        // URL 必须包含 ?beta=true 参数（某些中转服务依赖此参数验证请求来源）
+        // 健康检查不强制附加查询参数，保持与默认 Claude 路径一致
         let url = if base.ends_with("/v1") {
-            format!("{base}/messages?beta=true")
+            format!("{base}/messages")
         } else {
-            format!("{base}/v1/messages?beta=true")
+            format!("{base}/v1/messages")
         };
 
         let body = json!({