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2026-09-30: Claude Sonnet 4.5 model
- Takes effect
- 30 Nov 2026
- Published
- 4 Oct 2026
On September 30, 2026, Anthropic notified developers using Claude Sonnet 4.5 of its upcoming retirement on the Claude API. Retirement date Deprecated model Recommended replacement November 30, 2026 claude-sonnet-4-5-20250929 claude-sonnet-5-5
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