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Zenn (AI)Japan

【2026/9/28】Claude Sonnet 5.5リリース——単価据え置きで実コスト3割減、ProプランのデフォルトはOpusに交代

October 5

3行まとめ 2026年9月28日、AnthropicがClaude Sonnet 5.5をリリース。モデルIDはclaude-sonnet-5-5。単価はSonnet 5と同じ**$2/$10 per MTokのまま、30%以上の高速化とタスクあたり最大30%のコスト減**を実現した Terminal-Bench 4.0が10.3%→70.6%、CursorBench…

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