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Anthropic Claude Sonnet 4.5 end of life

41days

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    Photo: Claude Logo Symbol · CC0 · via Wikimedia Commons

    Schedule updated. Previously Tuesday, 29 September 2026.

    About this moment

    There are 42 days until Anthropic Claude Sonnet 4.5 end of life, on Monday, 30 November 2026.

    Anthropic Claude Sonnet 4.5 reaches end of life on November 30, 2026: upstream support ends and no further security fixes are expected. It was released on September 29, 2025. Active support ended on September 30, 2026.

    Where
    Worldwide
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    Date source

    endoflife.date

    Source last checked Oct 19, 2026

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