Anthropic retires claude-sonnet-4-5-20250929
Tech · Retirements · Tue, September 29, 2026 · Tentative
Claude API model retirement.
Also on Sep 29, 2026
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Source, method and history
- Source
- Anthropic
- How we know
- From the Sunsets API (sunsets.fru.dev), which reads each vendor's deprecation page.
- Who
- Anthropic
- Recurs
- one-off
- More on fru.dev
- sunsets.fru.dev
- Feed
- Subscribe to Retirements
- Changes
- 2026-09-25: added to 2026-09-29