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Anthropic◐breaks on a date

claude-sonnet-4-5-20250929 shutdown

Claude Sonnet 4.5 model. Shutdown date: 2026-11-30. Replacement: claude-sonnet-5-5.

claude-sonnet-4-5-20250929 shutdown: from its source to your code

platform.claude.comquote checked
claude-sonnet-5-5from claude-sonnet-4-5-20250929
2026-11-30in 24 days
Your code1 thing to find
Swapped in code

In its own wordsmatches the page ✓

| November 30, 2026 | `claude-sonnet-4-5-20250929` | `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-sonnet-4-5-20250929"

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read by a table · anthropic-2026-11-30-claude-sonnet-4-5-20250929