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Anthropic✕already broken

claude-3-sonnet-20240229 shutdown

Claude 2, Claude 2.1, and Claude Sonnet 3 models. Shutdown date: 2025-07-21. Replacement: claude-sonnet-5-5.

claude-3-sonnet-20240229 shutdown: from its source to your code

platform.claude.comquote checked
claude-sonnet-5-5from claude-3-sonnet-20240229
2025-07-21473 days ago
Your code1 thing to find
Swapped in code

In its own wordsmatches the page ✓

| July 21, 2025 | `claude-3-sonnet-20240229` | `claude-sonnet-5-5` |

platform.claude.com/docs/en/about-claude/model-dep…from the provider's own sitechecked 2026-11-04#dff781a1f1

What Teire looks for in your code

model ID "claude-3-sonnet-20240229"

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read by a table · anthropic-2025-07-21-claude-3-sonnet-20240229