AnnouncedTakes effect Nov 30, 2026
Announced: Claude Sonnet 4.5 (claude-sonnet-4-5-20250929) retires; Anthropic names Claude Sonnet 5.5 as the replacement
- For
- Claude Sonnet 4.5
- Takes effect
- Nov 30, 2026
- Source
- platform.claude.com
- Listed, read
- Nov 9, 2026