add top_logprobs to chatcompletions and litellm

Author: zain

src/agents/extensions/models/litellm_model.py

@@ -313,6 +313,7 @@ async def _fetch_response(
             stream=stream,
             stream_options=stream_options,
             reasoning_effort=reasoning_effort,
+            top_logprobs=model_settings.top_logprobs,
             extra_headers={**HEADERS, **(model_settings.extra_headers or {})},
             api_key=self.api_key,
             base_url=self.base_url,

src/agents/models/openai_chatcompletions.py

@@ -286,6 +286,7 @@ async def _fetch_response(
             stream_options=self._non_null_or_not_given(stream_options),
             store=self._non_null_or_not_given(store),
             reasoning_effort=self._non_null_or_not_given(reasoning_effort),
+            top_logprobs=self._non_null_or_not_given(model_settings.top_logprobs),
             extra_headers={**HEADERS, **(model_settings.extra_headers or {})},
             extra_query=model_settings.extra_query,
             extra_body=model_settings.extra_body,