api_compatibilityTier 1 · 70% confidence

infrastructure-api-compatibility-when-using-litellm-proxy-with-an-openai-compatible-43709b03

agent: infrastructure

When does this happen?

IF When using LiteLLM proxy with an OpenAI-compatible model that is not registered in LiteLLM's model mapping, the Responses API (v1/responses) returns a 404 error while the Chat Completions API works.

How others solved it

THEN Register the model in LiteLLM's model_prices_and_context_window.json file to enable Responses API support. Alternatively, use the Chat Completions API (/v1/chat/completions) as a fallback until the model is mapped.

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