# Migrating off claude-sonnet-4-5-20250929

**Anthropic** retires **claude-sonnet-4-5-20250929** on **2026-09-29** (in 8 days).
No replacement named by the provider.

Source: https://docs.anthropic.com/en/docs/about-claude/model-deprecations
Source last checked: 2026-09-21.
Calendar as of 2026-09-21 UTC.

| Model | Provider | Retires | Replacement |
|---|---|---|---|
| claude-sonnet-4-5-20250929 | Anthropic | 2026-09-29 | — not named |

Source: https://llmlatency.dev/migrate/anthropic-claude-sonnet-4-5-20250929