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Anthropic retires Claude Sonnet 4.5 model on Nov 30, 2026

By PulseAugur Editorial · [1 sources] ·

Anthropic has announced the deprecation of its Claude Sonnet 4.5 model, with the specific ID claude-sonnet-4-5-20250929 scheduled for retirement on November 30, 2026. Developers are advised to migrate to the recommended replacement, claude-sonnet-5-5, which offers the same pricing and a 1M token context window. This deprecation follows a pattern of previous model retirements by Anthropic, with a commitment to at least 60 days' notice for such changes. Users accessing the model through platforms like AWS or Google Cloud should verify their specific retirement schedules, as they may differ from Anthropic's direct API timelines. AI

IMPACT Developers using Claude Sonnet 4.5 must migrate to newer versions to avoid service disruption.

RANK_REASON Deprecation notice for a specific model version, not a new release.

Read on dev.to — Claude Code tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic retires Claude Sonnet 4.5 model on Nov 30, 2026

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Deprecation notice for a specific model version, not a new release.
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COVERAGE [1]

  1. dev.to — Claude Code tag TIER_1 English(EN) · RAXXO Studios ·

    Claude Sonnet 4.5 Retires November 30: What to Check Now

    <ul> <li><p>Anthropic deprecated Claude Sonnet 4.5 on September 30, 2026, giving 61 days before retirement</p></li> <li><p>claude-sonnet-4-5-20250929 stops answering requests after November 30, 2026, no grace period after that date</p></li> <li><p>The recommended replacement is c…

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