Fix au.anthropic.claude opus 4 6 v1

[anttttti]

Relevant issues

Fixes missing au.anthropic.claude-opus-4-6-v1. Removed duplicate entries for apac.anthropic.claude-opus-4-6-v1, which doesn't exist

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• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• My PR passes all unit tests on make test-unit
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Type

🆕 New Feature
🐛 Bug Fix
🧹 Refactoring
📖 Documentation
🚄 Infrastructure
✅ Test

Changes

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Project	Deployment	Actions	Updated (UTC)
litellm	Ready	Preview, Comment	Feb 10, 2026 5:55am

[greptile-apps]

Greptile Overview

Greptile Summary

This PR correctly fixes the regional prefix for the Claude Opus 4.6 model in the Australia region, changing from the incorrect apac.anthropic.claude-opus-4-6-v1 to the correct au.anthropic.claude-opus-4-6-v1.

Key Changes:

• Removed duplicate apac.anthropic.claude-opus-4-6-v1 entries (30 lines each) from both JSON configuration files
• These duplicate entries were causing JSON parsing issues
• Corrected the remaining entry to use au. prefix for Australia region (ap-southeast-2)
• Added comprehensive test coverage verifying the correct prefix usage and bedrock_converse_models registration
• Test documentation clarifies AWS Bedrock regional prefix conventions: us. (United States), eu. (Europe), au. (Australia/ap-southeast-2), apac. (Singapore/ap-southeast-1)

Important Note:
The code in litellm/llms/bedrock/chat/converse_transformation.py:305 currently only strips us., eu., and apac. prefixes but doesn't handle the newly-added au. prefix. This should be addressed to ensure proper handling of Australia region models.

Confidence Score: 4/5

• This PR is safe to merge but needs a follow-up fix for the regional prefix handling
• The PR correctly fixes the model configuration by removing duplicate entries and using the proper au. prefix for Australia. Tests are comprehensive and validate both the JSON structure and runtime registration. However, there's a logic issue in converse_transformation.py that doesn't handle the au. prefix, which needs to be addressed in a follow-up PR to ensure complete functionality.
• The litellm/llms/bedrock/chat/converse_transformation.py file needs attention - it must be updated to handle the au. prefix in the regional prefix stripping logic

Important Files Changed

Filename	Overview
model_prices_and_context_window.json	Correctly removes duplicate apac.anthropic.claude-opus-4-6-v1 entries and adds the proper au.anthropic.claude-opus-4-6-v1 model configuration for Australia region
litellm/model_prices_and_context_window_backup.json	Backup file correctly mirrors the changes made to the main configuration file
tests/test_litellm/test_claude_opus_4_6_config.py	Adds comprehensive test coverage for au. prefix and verifies the incorrect apac. prefix is not used, with detailed documentation of AWS regional prefix conventions

Sequence Diagram

sequenceDiagram
    participant User
    participant LiteLLM
    participant ModelConfig as model_prices_and_context_window.json
    participant BedrockConverse as bedrock_converse_models
    participant Bedrock as AWS Bedrock API

    Note over ModelConfig: Before PR: Had duplicate apac. entries
    Note over ModelConfig: After PR: Single au. entry (correct)
    
    User->>LiteLLM: Request with au.anthropic.claude-opus-4-6-v1
    LiteLLM->>ModelConfig: Load model configuration
    ModelConfig-->>LiteLLM: Return au. model config
    LiteLLM->>BedrockConverse: Register au. model
    BedrockConverse-->>LiteLLM: Model registered
    LiteLLM->>Bedrock: Call Australia region (ap-southeast-2)
    Bedrock-->>LiteLLM: Response
    LiteLLM-->>User: Return result
    
    Note over ModelConfig,BedrockConverse: PR correctly maps Australia to au. prefix
    Note over ModelConfig,BedrockConverse: apac. is for Singapore (ap-southeast-1)

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[greptile-apps]

_{3 files reviewed, 1 comment}

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[greptile-apps]

Additional Comments (1)

litellm/llms/bedrock/chat/converse_transformation.py
Missing au. prefix in regional prefix list. This code strips regional prefixes but only handles us., eu., and apac. - it doesn't handle the au. prefix introduced in this PR. This may cause issues when processing Australia region models.

        for prefix in ["us.", "eu.", "apac.", "au."]:

[krrishdholakia]

@anttttti can you fix the merge conflicts, so we can merge this in?

cc: @shin-bot-litellm for monitoring this pr

[anttttti]

@krrishdholakia Merged. Easy conflicts. Updated changes from both side.

[anttttti]

@anttttti can you fix the merge conflicts, so we can merge this in?

cc: @shin-bot-litellm for monitoring this pr

Can this be merged?

[anttttti]

@krrishdholakia bump on this. Merge?

[krrishdholakia]

done, thanks for the bump