diff --git a/g4f/api/__init__.py b/g4f/api/__init__.py
index 754a48f1..25694942 100644
--- a/g4f/api/__init__.py
+++ b/g4f/api/__init__.py
@@ -165,6 +165,19 @@ class Api:
         @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")
@@ -229,6 +242,7 @@ class Api:
         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({