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fix(bedrock): Only forward anthropic_beta header to Claude models #17208

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fix(bedrock): Only forward anthropic_beta header to Claude models #17208

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9 changes: 8 additions & 1 deletion litellm/llms/bedrock/messages/readme.md
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# /v1/messages

This folder contains transformation logic for calling bedrock models in the Anthropic /v1/messages API spec.
This folder contains transformation logic for calling bedrock models in the Anthropic /v1/messages API spec.

## Important Notes

- The `anthropic_beta` header is only forwarded to **Claude models** (models with provider "anthropic")
- Non-Claude models (Qwen, Nova, etc.) will have this header stripped automatically
- This prevents "unknown variant: anthropic_beta" errors on models that don't support Anthropic beta features
- Provider detection is performed using `BedrockLLM.get_bedrock_invoke_provider()` for robust model identification
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