# claude-3-sonnet-20240229 — AI model deprecation and retirement dates by provider

For claude-3-sonnet-20240229, provider is Anthropic; human-readable model name is Claude Sonnet 3; lifecycle status is Retired; deprecation announced is January 21, 2025; shutdown / retirement date is July 21, 2025, recorded from its source on 2026-08-12.

- **Provider:** Anthropic _(verified: appears in the quote below)_
- **Model ID / API name:** claude-3-sonnet-20240229 _(verified: appears in the quote below)_
- **Human-readable model name:** Claude Sonnet 3 _(verified: appears in the quote below)_
- **Lifecycle status:** Retired _(verified: appears in the quote below)_
- **Deprecation announced:** January 21, 2025 _(verified: appears in the quote below)_
- **Shutdown / retirement date:** July 21, 2025 _(verified: appears in the quote below)_
- **Recommended replacement:** claude-sonnet-4-6 _(verified: appears in the quote below)_
- **Platform / deployment scope:** Anthropic API / Claude Platform on AWS / Microsoft Foundry _(our reading, not quoted from the source)_

## What the source says

> On January 21, 2025, Anthropic notified developers using Claude 2, Claude 2.1, and Claude Sonnet 3 models of their upcoming retirements. Retirement date | Deprecated model | Recommended replacement | July 21, 2025 | claude-2.0 | claude-opus-4-8 | July 21, 2025 | claude-2.1 | claude-opus-4-8 | July 21, 2025 | claude-3-sonnet-20240229 | claude-sonnet-4-6 |  2024-09-04: Claude 1 and Instant models  These models were retired November 6, 2024. On September 4, 2024, Anthropic notified developers using Claude 1 and Instant models of their upcoming retirements.

## Source

- https://docs.anthropic.com/en/docs/about-claude/model-deprecations

Last verified: 2026-08-12. Review by: 2026-09-11.
Part of [AI model deprecation and retirement dates by provider](https://referencesource.org/ai-model-deprecation-and-retirement/).