fix(bedrock): Only forward anthropic_beta header to Claude models #17208
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Fix issue where anthropic_beta header was being sent to all Bedrock models via the /v1/messages endpoint, causing "unknown variant: anthropic_beta" errors on non-Claude models like Qwen and Nova. Changes: - Use BedrockLLM.get_bedrock_invoke_provider() for robust model detection - Only add anthropic_beta to request when provider is "anthropic" - Add comprehensive tests for Claude and non-Claude models - Update documentation explaining the filtering behavior This ensures Claude Code works seamlessly with non-Claude Bedrock models while preserving full anthropic_beta support for Claude models. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
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Title
Fix issue where anthropic_beta header was being sent to all Bedrock models via the /v1/messages endpoint, causing "unknown variant: anthropic_beta" errors on non-Claude models like Qwen and Nova.
Changes:
This ensures Claude Code works seamlessly with non-Claude Bedrock models while preserving full anthropic_beta support for Claude models.
Relevant issues
Fixes #17133
Pre-Submission checklist
Please complete all items before asking a LiteLLM maintainer to review your PR
tests/litellm/directory, Adding at least 1 test is a hard requirement - see detailsmake test-unitType
🐛 Bug Fix
Changes