Python: Prefer runtime kwargs for conversation_id in OpenAI Responses client (#3312)

* prefer kwargs conversation_id over options

* addressed comments

python/packages/core/tests/openai/test_openai_responses_client.py

@@ -2114,6 +2114,20 @@ async def test_prepare_options_store_parameter_handling() -> None:
     assert "previous_response_id" not in options
 
 
+async def test_conversation_id_precedence_kwargs_over_options() -> None:
+    """When both kwargs and options contain conversation_id, kwargs wins."""
+    client = OpenAIResponsesClient(model_id="test-model", api_key="test-key")
+    messages = [ChatMessage(role="user", text="Hello")]
+
+    # options has a stale response id, kwargs carries the freshest one
+    opts = {"conversation_id": "resp_old_123"}
+    run_opts = await client._prepare_options(messages, opts, conversation_id="resp_new_456")  # type: ignore
+
+    # Verify kwargs takes precedence and maps to previous_response_id for resp_* IDs
+    assert run_opts.get("previous_response_id") == "resp_new_456"
+    assert "conversation" not in run_opts
+
+
 def test_with_callable_api_key() -> None:
     """Test OpenAIResponsesClient initialization with callable API key."""