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Zenn (AI)Japan

Claude 5 世代 移行ガイド ― Opus 5 / Sonnet 5 / Fable 5.1 で変わった API とプロンプト

October 2

2026 年の Claude は、思考が既定でオン、サンプリングパラメータ廃止、プリフィル廃止、強制ツール呼び出し廃止、拒否の stop_reason、履歴編集の検査(preserved thinking)と、API の前提が大きく変わりました。

Models & releasesMCP, skills & tools
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