diff --git a/src/api-server.js b/src/api-server.js
index e17276a..40d3b3e 100644
--- a/src/api-server.js
+++ b/src/api-server.js
@@ -411,9 +411,15 @@ function createRequestHandler(config) {
         const apiService = await getApiService(currentConfig);
         const method = req.method;
         if (method === 'OPTIONS') {
-            res.writeHead(200, { 'Content-Type': 'application/json' });
-            console.log("OPTIONS REQUEST SUCCESS");
-            return res.end("OPTIONS REQUEST SUCCESS");
+            // 设置 CORS 头部，允许所有来源和方法
+            res.setHeader('Access-Control-Allow-Origin', '*');
+            res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS');
+            res.setHeader('Access-Control-Allow-Headers', 'Content-Type, Authorization, x-goog-api-key');
+            
+            // OPTIONS 请求通常返回 204 No Content
+            res.writeHead(204);
+            res.end();
+            return;
         }
 
         // Health check endpoint - no authentication required
diff --git a/src/common.js b/src/common.js
index fa16303..6182e95 100644
--- a/src/common.js
+++ b/src/common.js
@@ -2,7 +2,7 @@ import { promises as fs } from 'fs';
 import * as path from 'path';
 import * as http from 'http'; // Add http for IncomingMessage and ServerResponse types
 import { ApiServiceAdapter } from './adapter.js'; // Import ApiServiceAdapter
-import { convertData } from './convert.js';
+import { convertData, getOpenAIStreamChunkStop } from './convert.js';
 import { ProviderStrategyFactory } from './provider-strategies.js';
 
 export const API_ACTIONS = {
@@ -207,7 +207,8 @@ export async function handleStreamRequest(res, service, model, requestBody, from
     // The service returns a stream in its native format (toProvider).
     const nativeStream = await service.generateContentStream(model, requestBody);
     const needsConversion = getProtocolPrefix(fromProvider) !== getProtocolPrefix(toProvider);
-    const isClaude = getProtocolPrefix(fromProvider) === MODEL_PROTOCOL_PREFIX.CLAUDE;
+    const addEvent = getProtocolPrefix(fromProvider) === MODEL_PROTOCOL_PREFIX.CLAUDE;
+    const openStop = getProtocolPrefix(fromProvider) === MODEL_PROTOCOL_PREFIX.OPENAI;
 
     try {
         for await (const nativeChunk of nativeStream) {
@@ -225,7 +226,7 @@ export async function handleStreamRequest(res, service, model, requestBody, from
                 continue;
             }
 
-            if (isClaude) {
+            if (addEvent) {
                 res.write(`event: ${chunkToSend.type}\n`);
                 // console.log(`event: ${chunkToSend.type}\n`);
             }
@@ -233,6 +234,10 @@ export async function handleStreamRequest(res, service, model, requestBody, from
             res.write(`data: ${JSON.stringify(chunkToSend)}\n\n`);
             // console.log(`data: ${JSON.stringify(chunkToSend)}\n`);
         }
+        if (openStop && needsConversion) {
+            res.write(`data: ${JSON.stringify(getOpenAIStreamChunkStop(model))}\n\n`);
+            // console.log(`data: ${JSON.stringify(getOpenAIStreamChunkStop(model))}\n`);
+        }
 
     }  catch (error) {
         console.error('\n[Server] Error during stream processing:', error.stack);
diff --git a/src/convert.js b/src/convert.js
index b08508d..fc8c4f3 100644
--- a/src/convert.js
+++ b/src/convert.js
@@ -407,10 +407,18 @@ export function toOpenAIStreamChunkFromClaude(claudeChunk, model) {
         object: "chat.completion.chunk",
         created: Math.floor(Date.now() / 1000),
         model: model,
+        system_fingerprint: "",
         choices: [{
             index: 0,
-            delta: { content: claudeChunk },
-            finish_reason: null,
+            delta: { 
+                content: claudeChunk,
+                reasoning_content: ""
+            },
+            finish_reason: !claudeChunk ? 'stop' : null,
+            message: {
+                content: claudeChunk,
+                reasoning_content: ""
+            }
         }],
         usage:{
             prompt_tokens: 0,
@@ -420,6 +428,32 @@ export function toOpenAIStreamChunkFromClaude(claudeChunk, model) {
     };
 }
 
+export function getOpenAIStreamChunkStop(model) {
+    return {
+        id: `chatcmpl-${uuidv4()}`, // uuidv4 needs to be imported or handled
+        object: "chat.completion.chunk",
+        created: Math.floor(Date.now() / 1000),
+        model: model,
+        system_fingerprint: "",
+        choices: [{
+            index: 0,
+            delta: { 
+                content: "",
+                reasoning_content: ""
+            },
+            finish_reason: 'stop',
+            message: {
+                content: "",
+                reasoning_content: ""
+            }
+        }],
+        usage:{
+            prompt_tokens: 0,
+            completion_tokens: 0,
+            total_tokens: 0,
+        },
+    };
+}