LLM model shutdown · Anthropic
When does claude-sonnet-4-5-20250929 shut down?
Anthropic (Claude API) lists claude-sonnet-4-5-20250929 with a shutdown date of 30 Nov 2026. The provider’s page is quoted below.
What the provider’s page says
Anthropic · Claude API
Shutdown date: 30 Nov 2026.
Replacement the provider names: claude-sonnet-5-5
Model status: claude-sonnet-4-5-20250929 | Deprecated | September 30, 2026 | November 30, 2026
2026-09-30: Claude Sonnet 4.5 model: November 30, 2026 | claude-sonnet-4-5-20250929 | claude-sonnet-5-5
Source: docs.anthropic.com/en/docs/about-claude/model-deprecations, read 13 Nov 2026
These dates apply to Anthropic-operated platforms (Claude API, Claude Platform on AWS, Claude Models on Google Cloud (Anthropic managed), Microsoft Foundry). Amazon Bedrock and Claude Models on Google Cloud (Google managed) set their own schedules, so dates there can differ.
Check your own code
The model shutdown checker finds every model ID in code or a config file that has a row, counts the days from today and shows the same quotes. Nothing you paste leaves your browser. The Breakage Calendar row for this date says what else changes that day.
This page quotes the provider’s table. It does not say that a move to the replacement was tested, and the replacement may behave differently or take different parameters. Run your own tests before you change a model ID.