diff --git a/litellm/router.py b/litellm/router.py
index dd6303a948..a58f01fc12 100644
--- a/litellm/router.py
+++ b/litellm/router.py
@@ -242,22 +242,80 @@ class Router:
     ### COMPLETION, EMBEDDING, IMG GENERATION FUNCTIONS
 
     def completion(
-        self, model: str, messages: List[Dict[str, str]], **kwargs
+        self,
+        model: str,
+        # Optional OpenAI params: see https://platform.openai.com/docs/api-reference/chat/create
+        messages: List = [],
+        functions: Optional[List] = None,
+        function_call: Optional[str] = None,
+        timeout: Optional[Union[float, int]] = None,
+        temperature: Optional[float] = None,
+        top_p: Optional[float] = None,
+        n: Optional[int] = None,
+        stream: Optional[bool] = None,
+        stop=None,
+        max_tokens: Optional[float] = None,
+        presence_penalty: Optional[float] = None,
+        frequency_penalty: Optional[float] = None,
+        logit_bias: Optional[dict] = None,
+        user: Optional[str] = None,
+        # openai v1.0+ new params
+        response_format: Optional[dict] = None,
+        seed: Optional[int] = None,
+        tools: Optional[List] = None,
+        tool_choice: Optional[str] = None,
+        logprobs: Optional[bool] = None,
+        top_logprobs: Optional[int] = None,
+        deployment_id=None,
+        # set api_base, api_version, api_key
+        base_url: Optional[str] = None,
+        api_version: Optional[str] = None,
+        api_key: Optional[str] = None,
+        model_list: Optional[list] = None,  # pass in a list of api_base,keys, etc.
+        # Optional liteLLM function params
+        **kwargs,
     ) -> Union[ModelResponse, CustomStreamWrapper]:
         """
         Example usage:
         response = router.completion(model="gpt-3.5-turbo", messages=[{"role": "user", "content": "Hey, how's it going?"}]
         """
         try:
-            kwargs["model"] = model
-            kwargs["messages"] = messages
-            kwargs["original_function"] = self._completion
-            timeout = kwargs.get("request_timeout", self.timeout)
+            completion_kwargs = {
+                "model": model,
+                "messages": messages,
+                "functions": functions,
+                "function_call": function_call,
+                "timeout": timeout,
+                "temperature": temperature,
+                "top_p": top_p,
+                "n": n,
+                "stream": stream,
+                "stop": stop,
+                "max_tokens": max_tokens,
+                "presence_penalty": presence_penalty,
+                "frequency_penalty": frequency_penalty,
+                "logit_bias": logit_bias,
+                "user": user,
+                "response_format": response_format,
+                "seed": seed,
+                "tools": tools,
+                "tool_choice": tool_choice,
+                "logprobs": logprobs,
+                "top_logprobs": top_logprobs,
+                "deployment_id": deployment_id,
+                "base_url": base_url,
+                "api_version": api_version,
+                "api_key": api_key,
+                "model_list": model_list,
+                "original_function": self._completion,
+            }
             kwargs["num_retries"] = kwargs.get("num_retries", self.num_retries)
             kwargs.setdefault("metadata", {}).update({"model_group": model})
             with concurrent.futures.ThreadPoolExecutor(max_workers=1) as executor:
                 # Submit the function to the executor with a timeout
-                future = executor.submit(self.function_with_fallbacks, **kwargs)
+                future = executor.submit(
+                    self.function_with_fallbacks, **kwargs, **completion_kwargs
+                )
                 response = future.result(timeout=timeout)  # type: ignore
 
             return response