Anthropic、「Claude Opus 5.5」公開 Fable 5.1並みの性能で利用コスト4割減
ITmedia AI+ja
Anthropicは「Claude Opus 5.5」を発表した。多くの作業で「Fable 5.1」並みの性能を持ち、利用コストは「Opus 5」より約40％低い。Pro以上の有料プランとAPIで即日提供を始めた。アモデイCEOの「ペース調整」エッセイ後初のモデルで、METRなど外部機関による事前評価を経て、Fable 5.1と同等クラスのセーフガードを適用した。
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