Claude Opus 4.7 Migration Guide --- Breaking Changes and How to Handle Them
Claude Opus 4.7 shipped, and migrating from 4.6 comes with several breaking changes: extended thinking (enabled) is gone, temperature/top_p/top_k are gone, the new tokenizer produces up to 1.35x more tokens, thinking content is hidden by default, and prefill is gone. This article walks through every breaking change with Python and TypeScript Before/After snippets, behavioral changes, recommended settings, and a line-by-line migration checklist.