Claude Sonnet 4.5 model claude-sonnet-4-5-20250929 is now deprecated and will be retired on November 30, 2026.

Summary by gemma-4-12b. It may be wrong; the diff below is what actually changed. Raw: 27a82b6fc4-anthropic-model-deprecations.diff · commit 27a82b6fc4

diff --git a/snapshots/anthropic/model-deprecations.md b/snapshots/anthropic/model-deprecations.mdindex 5fc281d..45e3311 100644--- a/snapshots/anthropic/model-deprecations.md+++ b/snapshots/anthropic/model-deprecations.md@@ -76,7 +76,8 @@ Current and recently retired models are listed in the following table with their | claude-opus-4-1-20250805 | Retired | June 5, 2026 | August 5, 2026 | | claude-opus-4-20250514 | Retired | April 14, 2026 | June 15, 2026 |+| claude-sonnet-5-5 | Active | N/A | Not sooner than September 28, 2027 | | claude-sonnet-5 | Active | N/A | Not sooner than June 30, 2027 | | claude-sonnet-4-6 | Active | N/A | Not sooner than February 17, 2027 |-| 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 | | claude-sonnet-4-20250514 | Retired | April 14, 2026 | June 15, 2026 | | claude-3-7-sonnet-20250219 | Retired | October 28, 2025 | February 19, 2026 |@@ -89,4 +90,12 @@ Current and recently retired models are listed in the following table with their All deprecations are listed in the following sections, with the most recent announcements first. +### 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` |+ ### 2026-06-05: Claude Opus 4.1 model

← Anthropic timeline