Anthropic claude-sonnet-4-5-20250929: sunset date 2026-11-30
The sunset date for Anthropic claude-sonnet-4-5-20250929 is 2026-11-30, which is 51 days after 2026-10-10, the date this data was compiled.
- Provider
- Anthropic
- Category
- ai-model
- Sunset date
- 2026-11-30 (51 days remaining as of 2026-10-10)
- What stops working
- Claude API requests to claude-sonnet-4-5-20250929 fail after the retirement date.
- Replacement
- claude-sonnet-5-5
Source
Model deprecations, platform.claude.com (printed as text, not linked). Read on 2026-10-10. Confirm the date on that page before acting.
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