migration-guide changedmodels/opus-5-5/migration-guide
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11---
2title: Migrating to Claude Opus 5.5
2title: Claude Opus 5.5 migration guide
33url: https://platform.claude.com/docs/en/models/opus-5-5/migration-guide
4description: "Migrate to Claude Opus 5.5 from earlier Opus models or Claude Sonnet 5: request settings that return errors, thinking blocks in every response, and a checklist for each starting model."
4description: Switch to Claude Opus 5.5 from earlier Opus models or Claude Sonnet 5 with this migration guide. The guidance to enable Claude Opus 5.5 includes request settings that return errors, thinking blocks in every response, and a checklist for each starting model.
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