# When is claude-sonnet-4-5-20250929 retired?

claude-sonnet-4-5-20250929 on Anthropic is scheduled to shut down on Nov 30, 2026.

Anthropic recommends migrating to claude-sonnet-5-5.

- Provider: Anthropic
- Model ID: claude-sonnet-4-5-20250929
- Status: deprecated
- Deprecation announced: 2026-09-30
- Shutdown date: 2026-11-30
- Replacement: claude-sonnet-5-5
- Replacement status: active
- Replacement kind: same_family
- End of replacement chain: claude-sonnet-5-5 (active, anthropic)
- Official source: https://platform.claude.com/docs/en/about-claude/model-deprecations
- Last checked: 2026-11-06T14:15:07+00:00
- Check status: verified
- Provider coverage today: https://aideprecations.com/api/v1/coverage.json
- Page: https://aideprecations.com/anthropic/claude-sonnet-4-5-20250929/

Cite as: AI Deprecations, "claude-sonnet-4-5-20250929 deprecation date", https://aideprecations.com/anthropic/claude-sonnet-4-5-20250929/ (source: https://platform.claude.com/docs/en/about-claude/model-deprecations). Data CC BY 4.0. Always confirm on the official source.