diff --git a/g4f/api/__init__.py b/g4f/api/__init__.py
index 256949420c..fadeb0d8e3 100644
--- a/g4f/api/__init__.py
+++ b/g4f/api/__init__.py
@@ -165,19 +165,6 @@ async def model_info(model_name: str):
         @self.app.post("/v1/chat/completions")
         async def chat_completions(config: ChatCompletionsConfig, request: Request = None, provider: str = None):
             try:
-                # Find the last delimiter with ':' or '-'
-                if ':' in config.model:
-                    model_parts = config.model.rsplit(":", 1)
-                elif '-' in config.model:
-                    model_parts = config.model.rsplit("-", 1)
-                else:
-                    model_parts = [config.model]  # There is no prefix.
-
-                base_model = model_parts[0]  # We use the base model name
-                model_prefix = model_parts[1] if len(model_parts) > 1 else None
-
-                config.model = base_model  # Update the configuration to the basic model
-
                 config.provider = provider if config.provider is None else config.provider
                 if config.api_key is None and request is not None:
                     auth_header = request.headers.get("Authorization")
@@ -206,9 +193,13 @@ async def chat_completions(config: ChatCompletionsConfig, request: Request = Non
                     return JSONResponse(response_list[0].to_json())
 
                 # Streaming response
+                async def async_generator(sync_gen):
+                    for item in sync_gen:
+                        yield item
+
                 async def streaming():
                     try:
-                        async for chunk in response:
+                        async for chunk in async_generator(response):
                             yield f"data: {json.dumps(chunk.to_json())}\n\n"
                     except GeneratorExit:
                         pass
@@ -242,7 +233,6 @@ async def generate_image(config: ImageGenerationConfig):
         async def completions():
             return Response(content=json.dumps({'info': 'Not working yet.'}, indent=4), media_type="application/json")
 
-
 def format_exception(e: Exception, config: Union[ChatCompletionsConfig, ImageGenerationConfig]) -> str:
     last_provider = g4f.get_last_provider(True)
     return json.dumps({