Merge pull request #14146 from ProjectAlita/gpt_5_unsupported_params

GPT-5: Drop unsupported params

Author: krrishdholakia

litellm/llms/openai/chat/gpt_5_transformation.py

@@ -28,7 +28,18 @@ def get_supported_openai_params(self, model: str) -> list:
         base_gpt_series_params.extend(gpt_5_only_params)
         if not supports_tool_choice(model=model):
             base_gpt_series_params.remove("tool_choice")
-        return base_gpt_series_params
+
+        non_supported_params = [
+            "logprobs",
+            "top_p",
+            "presence_penalty",
+            "frequency_penalty",
+            "top_logprobs",
+        ]
+
+        return [
+            param for param in base_gpt_series_params if param not in non_supported_params
+        ]
 
     def map_openai_params(
         self,

tests/test_litellm/llms/openai/test_gpt5_transformation.py

@@ -41,3 +41,14 @@ def test_gpt5_temperature_error(config: OpenAIConfig):
             model="gpt-5",
             drop_params=False,
         )
+
+
+def test_gpt5_unsupported_params_drop(config: OpenAIConfig):
+    assert "top_p" not in config.get_supported_openai_params(model="gpt-5")
+    params = config.map_openai_params(
+        non_default_params={"top_p": 0.5},
+        optional_params={},
+        model="gpt-5",
+        drop_params=True,
+    )
+    assert "top_p" not in params