claude-sonnet-4-5-20250929 · Active · N/A · Not sooner than September 29, 2026 · claude-sonnet-4-5-20250929 · Deprecated · …
Anthropic Model Deprecations → · 2026-09-30T18:39:33.115Z
- | claude-sonnet-4-5-20250929 | Active | N/A | Not sooner than September 29, 2026 | + | claude-sonnet-4-5-20250929 | Deprecated | September 30, 2026 | November 30, 2026 | + ### 2026-09-30: Claude Sonnet 4.5 model + 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` |