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Anthropicが「Claude Opus 5.5」発表

24/9/2026

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Anthropicは、2026年9月22日、新たな「Claude 5.5」ファミリーの最初のモデル「Claude Opus 5.5」の提供を開始しました。Claude Opus 5.5は多くの作業で上位モデル「Claude Fable 5.1」並みの性能を発揮し、一般的な作業ではOpus 5より運用コストが40%下がるということです。「Artificial Analysis Intelligence Index」では、Opus 5.5が58点で、GPT-6 AstraやClaude Fable 5.1などのモデルを総合スコアで上回りトップになりました。
「Claude Opus 5.5」の特徴や評判などについて、生成AIに深掘り調査させましたので、ご参照ください。なお、生成AIによる調査・分析結果は、公開された情報だけに基づくものであり、必ずしも実情を示したものではなく、誤った情報を含む可能性があることにご留意のうえ、ご参照ください。
 
We’re introducing Claude Opus 5.5, the first model in our new Claude 5.5 family.
https://www.anthropic.com/claude-opus-5-5
 
Claude Opus 5.5発表、Astra超え・Fable 5.1級で半額以下。口調も結論から分かりやすく改善、無料リセット配布
https://news.yahoo.co.jp/articles/1055bc1a895d92429bdc77ab39863d41379ef0bc
 
 
Anthropic Announces Claude Opus 5.5
On September 22, 2026, Anthropic launched Claude Opus 5.5, the first model in its new Claude 5.5 family. Claude Opus 5.5 reportedly delivers performance comparable to the higher-tier Claude Fable 5.1 on many tasks, while reducing operating costs by 40% compared with Opus 5 for typical workloads. On the Artificial Analysis Intelligence Index, Opus 5.5 scored 58, taking the top spot overall ahead of models such as GPT-6 Astra and Claude Fable 5.1.
I asked generative AI to conduct an in-depth investigation into the features, reception, and other aspects of Claude Opus 5.5. Please refer to the findings. When reviewing them, please bear in mind that the AI-generated research and analysis are based solely on publicly available information, may not necessarily reflect the actual situation, and may contain errors.

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