What problem does it solve? Upgrading a codebase from Claude Sonnet 4.0, Sonnet 4.5, or Opus 4.1 to Opus 4.5 requires finding every model string across multiple platforms, removing unsupported beta headers, and adjusting prompts for known behavioral differences. Doing this manually is error-prone and easy to miss edge cases. ## Core Features & Use Cases - Model String Migration: Detects and replaces source model strings with the correct Opus 4.5 identifier for Anthropic API, AWS Bedrock, Google Vertex AI, and Azure AI Foundry. - Beta Header Cleanup: Removes the unsupported context-1m-2025-08-07 beta header and adds the effort parameter set to "high" for best performance. - Prompt Adjustment Guidance: Provides targeted snippets for known Opus 4.5 behaviors such as tool overtriggering, over-engineering, code exploration, frontend design quality, and sensitivity to the word "think". - Use Case: A team upgrading their production API calls from Sonnet 4.5 to Opus 4.5 can run this migration to update all model strings, configure the effort parameter, and fix prompt issues reported after the switch. ## Quick Start Migrate my codebase from Claude Sonnet 4.5 to Opus 4.5, updating all model strings and API calls.
