claude-sonnet-4-5-20250929 — Deprecated — shutdown November 30, 2026
For claude-sonnet-4-5-20250929, provider is Anthropic; lifecycle status is Deprecated; deprecation announced is September 30, 2026; shutdown / retirement date is November 30, 2026; recommended replacement is claude-sonnet-5-5; platform / deployment scope is Anthropic API / Claude Platform on AWS / Microsoft Foundry, recorded from its source on 2026-09-30; source re-checked 2026-11-11.
- Provider
- Anthropic our reading
- Model ID / API name
- claude-sonnet-4-5-20250929 verified
- Lifecycle status
- Deprecated verified
- Deprecation announced
- September 30, 2026 verified
- Shutdown / retirement date
- November 30, 2026 verified
- Recommended replacement
- claude-sonnet-5-5 verified
- Platform / deployment scope
- Anthropic API / Claude Platform on AWS / Microsoft Foundry our reading
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
| claude-sonnet-4-5-20250929 | Deprecated | September 30, 2026 | November 30, 2026 |
— platform.claude.com, retrieved 2026-09-30
Where each value comes from
This source states these in separate places, so each value is shown with the passage that states it.
Deprecation announced
On September 30, 2026, Anthropic notified developers using Claude Sonnet 4.5 of its upcoming retirement on the Claude API.
Recommended replacement
| November 30, 2026 | `claude-sonnet-4-5-20250929` | `claude-sonnet-5-5` |
Platform / deployment scope
The dates on this page apply to Anthropic-operated platforms: the Claude API, Claude Platform on AWS, and Microsoft Foundry. Partner-operated platforms (Amazon Bedrock and Google Cloud) set their own retirement schedules, so a model's lifecycle status and dates can differ.
— all from platform.claude.com, retrieved 2026-09-30
Sources
- platform.claude.comhttps://platform.claude.com/docs/en/about-claude/model-deprecations.md
- platform.claude.comhttps://platform.claude.com/docs/en/about-claude/model-deprecations