# Claude Sonnet 4.5 deprecated, retires 2026-09-29 → Claude Sonnet 5.5

> Source: <https://llmstatus.ai/m/anthropic/anthropic/claude-sonnet-4-5>
> Published: 2026-10-01 00:00:26+00:00

AN✕ Retired

# Claude Sonnet 4.5

Anthropic · claude-sonnet-4-5-20250929

Claude Sonnettext+vision1000k context64k max out

also matches: 

`claude-sonnet-4-5-20250929`` claude-sonnet-4-5``claude-sonnet-4.5`` microsoft/claude-sonnet-4-5``anthropic/claude-sonnet-4-5-20250929`` anthropic/claude-sonnet-4-5`
[provider announcement →](https://docs.claude.com/en/docs/about-claude/model-deprecations)

Does your code call Claude Sonnet 4.5?

$ curl -fsSL https://llmstatus.ai/install.sh | bash

Then `mm status` in any repo — it finds every model you use and flags the ones on a clock. No account, nothing uploaded.

[Get alerted before it retires →](https://llmstatus.ai/sign-up)