feat(router.py): Fixes https://github.com/BerriAI/litellm/issues/3769

litellm/router.py

@@ -376,7 +376,7 @@ class Router:
             self.lowesttpm_logger = LowestTPMLoggingHandler(
                 router_cache=self.cache,
                 model_list=self.model_list,
-                routing_args=routing_strategy_args
+                routing_args=routing_strategy_args,
             )
             if isinstance(litellm.callbacks, list):
                 litellm.callbacks.append(self.lowesttpm_logger)  # type: ignore
@@ -384,7 +384,7 @@ class Router:
             self.lowesttpm_logger_v2 = LowestTPMLoggingHandler_v2(
                 router_cache=self.cache,
                 model_list=self.model_list,
-                routing_args=routing_strategy_args
+                routing_args=routing_strategy_args,
             )
             if isinstance(litellm.callbacks, list):
                 litellm.callbacks.append(self.lowesttpm_logger_v2)  # type: ignore
@@ -3207,7 +3207,7 @@ class Router:
         model: str,
         healthy_deployments: List,
         messages: List[Dict[str, str]],
-        allowed_model_region: Optional[Literal["eu"]] = None,
+        request_kwargs: Optional[dict] = None,
     ):
         """
         Filter out model in model group, if:
@@ -3299,7 +3299,11 @@ class Router:
                         continue
 
             ## REGION CHECK ##
-            if allowed_model_region is not None:
+            if (
+                request_kwargs is not None
+                and request_kwargs.get("allowed_model_region") is not None
+                and request_kwargs["allowed_model_region"] == "eu"
+            ):
                 if _litellm_params.get("region_name") is not None and isinstance(
                     _litellm_params["region_name"], str
                 ):
@@ -3313,13 +3317,37 @@ class Router:
                 else:
                     verbose_router_logger.debug(
                         "Filtering out model - {}, as model_region=None, and allowed_model_region={}".format(
-                            model_id, allowed_model_region
+                            model_id, request_kwargs.get("allowed_model_region")
                         )
                     )
                     # filter out since region unknown, and user wants to filter for specific region
                     invalid_model_indices.append(idx)
                     continue
 
+            ## INVALID PARAMS ## -> catch 'gpt-3.5-turbo-16k' not supporting 'response_object' param
+            if request_kwargs is not None and litellm.drop_params == False:
+                # get supported params
+                model, custom_llm_provider, _, _ = litellm.get_llm_provider(
+                    model=model, litellm_params=LiteLLM_Params(**_litellm_params)
+                )
+
+                supported_openai_params = litellm.get_supported_openai_params(
+                    model=model, custom_llm_provider=custom_llm_provider
+                )
+
+                if supported_openai_params is None:
+                    continue
+                else:
+                    # check the non-default openai params in request kwargs
+                    non_default_params = litellm.utils.get_non_default_params(
+                        passed_params=request_kwargs
+                    )
+                    # check if all params are supported
+                    for k, v in non_default_params.items():
+                        if k not in supported_openai_params:
+                            # if not -> invalid model
+                            invalid_model_indices.append(idx)
+
         if len(invalid_model_indices) == len(_returned_deployments):
             """
             - no healthy deployments available b/c context window checks or rate limit error
@@ -3469,25 +3497,14 @@ class Router:
             if request_kwargs is not None
             else None
         )
+
         if self.enable_pre_call_checks and messages is not None:
-            if _allowed_model_region == "eu":
+            healthy_deployments = self._pre_call_checks(
-                healthy_deployments = self._pre_call_checks(
+                model=model,
-                    model=model,
+                healthy_deployments=healthy_deployments,
-                    healthy_deployments=healthy_deployments,
+                messages=messages,
-                    messages=messages,
+                request_kwargs=request_kwargs,
-                    allowed_model_region=_allowed_model_region,
+            )
-                )
-            else:
-                verbose_router_logger.debug(
-                    "Ignoring given 'allowed_model_region'={}. Only 'eu' is allowed".format(
-                        _allowed_model_region
-                    )
-                )
-                healthy_deployments = self._pre_call_checks(
-                    model=model,
-                    healthy_deployments=healthy_deployments,
-                    messages=messages,
-                )
 
         if len(healthy_deployments) == 0:
             if _allowed_model_region is None:

litellm/tests/test_router.py

@@ -689,6 +689,44 @@ def test_router_context_window_check_pre_call_check_out_group():
         pytest.fail(f"Got unexpected exception on router! - {str(e)}")
 
 
+def test_filter_invalid_params_pre_call_check():
+    """
+    - gpt-3.5-turbo supports 'response_object'
+    - gpt-3.5-turbo-16k doesn't support 'response_object'
+
+    run pre-call check -> assert returned list doesn't include gpt-3.5-turbo-16k
+    """
+    try:
+        model_list = [
+            {
+                "model_name": "gpt-3.5-turbo",  # openai model name
+                "litellm_params": {  # params for litellm completion/embedding call
+                    "model": "gpt-3.5-turbo",
+                    "api_key": os.getenv("OPENAI_API_KEY"),
+                },
+            },
+            {
+                "model_name": "gpt-3.5-turbo",
+                "litellm_params": {
+                    "model": "gpt-3.5-turbo-16k",
+                    "api_key": os.getenv("OPENAI_API_KEY"),
+                },
+            },
+        ]
+
+        router = Router(model_list=model_list, set_verbose=True, enable_pre_call_checks=True, num_retries=0)  # type: ignore
+
+        filtered_deployments = router._pre_call_checks(
+            model="gpt-3.5-turbo",
+            healthy_deployments=model_list,
+            messages=[{"role": "user", "content": "Hey, how's it going?"}],
+            request_kwargs={"response_format": {"type": "json_object"}},
+        )
+        assert len(filtered_deployments) == 1
+    except Exception as e:
+        pytest.fail(f"Got unexpected exception on router! - {str(e)}")
+
+
 @pytest.mark.parametrize("allowed_model_region", ["eu", None])
 def test_router_region_pre_call_check(allowed_model_region):
     """

litellm/utils.py

@@ -5811,7 +5811,7 @@ def get_optional_params(
             "mistralai/Mistral-7B-Instruct-v0.1",
             "mistralai/Mixtral-8x7B-Instruct-v0.1",
         ]:
-            supported_params += [
+            supported_params += [  # type: ignore
                 "functions",
                 "function_call",
                 "tools",
@@ -6061,6 +6061,47 @@ def get_optional_params(
     return optional_params
 
 
+def get_non_default_params(passed_params: dict) -> dict:
+    default_params = {
+        "functions": None,
+        "function_call": None,
+        "temperature": None,
+        "top_p": None,
+        "n": None,
+        "stream": None,
+        "stream_options": None,
+        "stop": None,
+        "max_tokens": None,
+        "presence_penalty": None,
+        "frequency_penalty": None,
+        "logit_bias": None,
+        "user": None,
+        "model": None,
+        "custom_llm_provider": "",
+        "response_format": None,
+        "seed": None,
+        "tools": None,
+        "tool_choice": None,
+        "max_retries": None,
+        "logprobs": None,
+        "top_logprobs": None,
+        "extra_headers": None,
+    }
+    # filter out those parameters that were passed with non-default values
+    non_default_params = {
+        k: v
+        for k, v in passed_params.items()
+        if (
+            k != "model"
+            and k != "custom_llm_provider"
+            and k in default_params
+            and v != default_params[k]
+        )
+    }
+
+    return non_default_params
+
+
 def calculate_max_parallel_requests(
     max_parallel_requests: Optional[int],
     rpm: Optional[int],
@@ -6287,7 +6328,7 @@ def get_first_chars_messages(kwargs: dict) -> str:
         return ""
 
 
-def get_supported_openai_params(model: str, custom_llm_provider: str):
+def get_supported_openai_params(model: str, custom_llm_provider: str) -> Optional[list]:
     """
     Returns the supported openai params for a given model + provider
 
@@ -6295,6 +6336,10 @@ def get_supported_openai_params(model: str, custom_llm_provider: str):
     ```
     get_supported_openai_params(model="anthropic.claude-3", custom_llm_provider="bedrock")
     ```
+
+    Returns:
+    - List if custom_llm_provider is mapped
+    - None if unmapped
     """
     if custom_llm_provider == "bedrock":
         if model.startswith("anthropic.claude-3"):
@@ -6534,6 +6579,8 @@ def get_supported_openai_params(model: str, custom_llm_provider: str):
     elif custom_llm_provider == "watsonx":
         return litellm.IBMWatsonXAIConfig().get_supported_openai_params()
 
+    return None
+
 
 def get_formatted_prompt(
     data: dict,