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Written by AI from the official notes. Check them for exact details.Claude Sonnet 3.5 models are being deprecated, and users should migrate to Claude Sonnet 4.5.
- Claude Sonnet 3.5 models will retire on October 28, 2025.
- Users are recommended to migrate to Claude Sonnet 4.5.
- 1-hour cache duration for prompt caching no longer needs a beta header.
Why it matters: Users of Claude Sonnet models should prepare for migration to ensure continued access to improved capabilities.
Full release notes2 changes
- We announced the deprecation of the Claude Sonnet 3.5 models (
claude-3-5-sonnet-20240620andclaude-3-5-sonnet-20241022). These models will be retired on October 28, 2025. We recommend migrating to Claude Sonnet 4.5 (claude-sonnet-4-5-20250929) for improved performance and capabilities. Read more in Model deprecations. - The 1-hour cache duration for prompt caching no longer requires a beta header. Learn more in Prompt caching.