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fix(chatgpt): leave an empty string input for the backend to reject

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OpenAI's Responses API answers 400 for input "", so wrapping it into a
one-message list would turn that error into a billed completion on the
Codex backend. Only a non-empty string becomes the user message.
This commit is contained in:
mateo-berri 2026-10-05 16:37:38 -07:00
parent 3aeca94708
commit dfd16b0b50
2 changed files with 13 additions and 1 deletions
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2
litellm/llms/chatgpt/responses/transformation.py
View file

@ -82,7 +82,7 @@ class ChatGPTResponsesAPIConfig(OpenAIResponsesAPIConfig):
litellm_params,
headers,
)
if isinstance(input, str):
if isinstance(input, str) and input != "":
request["input"] = [{"role": "user", "content": [{"type": "input_text", "text": input}]}]
base_instructions: Final = get_chatgpt_default_instructions()
existing_instructions: Final = request.get("instructions")

12
tests/unit/llms/chatgpt/responses/test_chatgpt_responses_transformation.py
View file

@ -226,6 +226,18 @@ class TestChatGPTResponsesAPITransformation:
assert request["input"] == list_input
def test_chatgpt_leaves_empty_string_input_for_the_backend_to_reject(self) -> None:
config: Final = ChatGPTResponsesAPIConfig()
request: Final = config.transform_responses_api_request(
model="chatgpt/gpt-6.1-sol",
input="",
response_api_optional_request_params={},
litellm_params=GenericLiteLLMParams(),
headers={},
)
assert request["input"] == ""
@pytest.mark.parametrize(
"model_name",
[