What this error means

litellm.BadRequestError: AnthropicException - This model does not support assistant message prefill is a LiteLLM failure pattern reported for developers trying to fix litellm mid-stream fallback assistant prefill error claude. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

When streaming request fails mid-stream, Router.stream_with_fallbacks appends assistant message with prefix=True. Claude Sonnet 4.6/Opus 4.7 reject this with 400. Fallback feature silently unusable for these models. No documented workaround except monkey-patching.

Common causes

  • Users relying on LiteLLM's streaming fallback feature for Claude models find it silently broken — fallback requests include unsupported assistant prefill, causing 400 errors and hiding the original failure
  • When streaming request fails mid-stream, Router.stream_with_fallbacks appends assistant message with prefix=True. Claude Sonnet 4.6/Opus 4.7 reject this with 400. Fallback feature silently unusable for these models. No documented workaround except monkey-patching.

Quick fixes

  1. Confirm the exact error signature matches litellm.BadRequestError: AnthropicException - This model does not support assistant message prefill.
  2. Check the LiteLLM account, local tool state, and provider configuration involved in the failing workflow.
  3. Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

  • Verify the command, editor, extension, or API client that produced the error.
  • Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
  • Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

  1. Capture the exact error message and the command, editor action, or request that triggered it.
  2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
  3. Review the source evidence below and compare it with your environment.
  4. Apply one change at a time and rerun the smallest failing action.
  5. Keep the working fix documented for the team or deployment environment.

How to prevent it

  • Keep provider/tool configuration documented.
  • Record non-secret diagnostics such as tool version, provider name, model name, and command path.
  • Add a lightweight check before CI or production workflows depend on the tool.