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Anthropic Claude Sonnet 4.5 end of life

12days

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    There are 13 days until Anthropic Claude Sonnet 4.5 end of life, on Tuesday, 29 September 2026.

    Anthropic Claude Sonnet 4.5 reaches end of life on September 29, 2026: upstream support ends and no further security fixes are expected. It was released on September 29, 2025.

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    Last verified Sep 16, 2026

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