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Claude Sonnet 4.5 Retires November 30: What to Check Now

This story is from 2026-10-09. It is preserved in the archive; the latest stories are on the live feed.

Anthropic deprecated Claude Sonnet 4.5 on September 30, 2026, giving 61 days before retirement claude-sonnet-4-5-20250929 stops answering requests after November 30, 2026, no grace period after that date The recommended replacement is claude-sonnet-5-5, priced the same and sharing the 1M token cont…

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  1. 2026-10-09 21:51 · DEV Community — AI
    Claude Sonnet 4.5 Retires November 30: What to Check Now

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