Error4 reports
Fix BadRequestError
in LiteLLM
✅ Solution
BadRequestError in litellm usually stems from incorrect or unsupported model parameters, or an invalid API key being passed to the model provider. To fix this, double-check that your `model`, `messages`, and other parameters conform to the provider's API documentation (e.g., OpenAI, Gemini, Azure). Also, ensure your API key is valid and has the necessary permissions for the model being used.
Related Issues
Real GitHub issues where developers encountered this error:
[Bug]: reasoning effort does not work for `gemini-3.1-flash-lite-preview`Mar 3, 2026
[Bug]: Cannot Use Gemini Deep Research InteractionsMar 3, 2026
[Bug]: LiteLLM 1.82.1 OpenRouter Model IDs no longer workingMar 3, 2026
[Bug]: Australian Bedrock Sonnet 4.6 not working, listed as APAC RegionalMar 3, 2026
Timeline
First reported:Mar 3, 2026
Last reported:Mar 3, 2026