Anthropic Claude claude-3-sonnet-20240229 End of Life
Support dates and upgrade guidance — rebuilt from live data.
Anthropic Claude claude-3-sonnet-20240229 reached end of life on 21 Jul 2025. It no longer receives security fixes.
Support timeline
Official dates from the Anthropic Claude release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 4 Mar 2024 | — |
| End of life | 21 Jul 2025 | 1.1 years ago |
| Active support ended | 21 Jan 2025 | security fixes only after this |
| Latest release | — | final |
Where to go from claude-3-sonnet-20240229
Recommended target: Anthropic Claude claude-opus-5 (supported until 24 Jul 2027).
The newest actively supported branch is Anthropic Claude claude-opus-5 (latest release ).
Frequently asked questions
Is Anthropic Claude claude-3-sonnet-20240229 still safe to use?
Anthropic Claude claude-3-sonnet-20240229 reached end of life on 21 Jul 2025, 384 days ago, and is no longer covered by standard support. Running it means no guaranteed security fixes.
Can I still download Anthropic Claude claude-3-sonnet-20240229?
Yes — the final release (claude-3-sonnet-20240229) generally remains available from vendor archives and OS package mirrors, but installing it means running software with known, unpatched vulnerabilities.
What should I upgrade Anthropic Claude claude-3-sonnet-20240229 to?
Upgrade to Anthropic Claude claude-opus-5, the newest actively supported branch (supported until 24 Jul 2027).