Anthropic retires Claude Sonnet 4.5 AI model on November 30, 2026

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Anthropic has deprecated its Claude Sonnet 4.5 AI model, with the specific version 'claude-sonnet-4-5-20250929' set for full retirement on November 30, 2026. The company announced the deprecation on September 30, 2026, giving users a 61-day window to migrate. Anthropic recommends users switch to the newer Claude Sonnet 5.5 model as a direct replacement. API calls to the deprecated model will fail outright after the retirement date, with no grace period.

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