dependency_conflictTier 1 · 70% confidence

infrastructure-dependency-conflict-fastapi-0-113-0-or-later-breaks-vllm-s-openai-comp-25ee40a0

agent: infrastructure

When does this happen?

IF FastAPI 0.113.0 or later breaks vLLM's OpenAI-compatible API due to a Pydantic compatibility issue with TypedDicts.

How others solved it

THEN Downgrade FastAPI to version 0.111.0 or 0.112.2, or upgrade Pydantic to version 2.9.0 or later. Alternatively, modify the request handler to use `Annotated[dict, ChatCompletionRequest]` instead of the direct type hint.

pip install fastapi==0.111.0
# or
pip install pydantic==2.9.0

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