Anthropic00:00PolicyOfficial Docs
Deprecation of Claude Sonnet 4 and Opus 4 Announced
Upgrade to newer models for better performance.
Key Points
- 1Sonnet 4/Opus 4 retirement
- 2Migrate to new models
- 3Date: late 2026
Anthropic announced deprecation of Claude Sonnet 4 and Opus 4 on API, retiring later 2026. Migrate to newer models.