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「Claude Fable 5.1」と「Claude Mythos 5.1」発表

2/9/2026

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2026年9月1日、Anthropicは最新モデル「Claude Fable 5.1」と「Claude Mythos 5.1」を発表しました。両モデルは、コーディング、AIエージェント、科学研究などの高度なタスクを対象としたモデルです。大きなポイントは、Fable 5.1とMythos 5.1が完全に別のモデルではなく、同じ基盤モデルを異なるセーフガードで提供していることです。
AIモデルの性能を測定する独立評価プラットフォーム「Artificial Analysis」が提供する、AIモデルの総合的な知能を評価するための複合指標(ベンチマーク)「Artificial Analysis Intelligence Index」では、66で最高評価です。(Claude Opus 5 (max) 63, GPT-5.6 Sol (max) 61)
「コーディングと知識労働のための世界最先端のモデルであり、その研究能力は、AIモデルが科学の進歩にどのように貢献していくかを示す初期段階の展望を示しています。」ということですので、楽しみです。
Claude Fable 5.1 と Claude Mythos 5.1について生成AIに深掘り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。
 
Claude: Fable 5.1 and Mythos 5.1
https://www.anthropic.com/claude-fable-and-mythos-5-1
 
 
Anthropic Announces “Claude Fable 5.1” and “Claude Mythos 5.1”
On September 1, 2026, Anthropic announced its latest models, Claude Fable 5.1 and Claude Mythos 5.1. Both models are designed for advanced tasks such as coding, AI agent operations, and scientific research. One of the most notable aspects of the announcement is that Fable 5.1 and Mythos 5.1 are not entirely separate models; rather, they are based on the same underlying foundation model but are offered with different safeguards.
On the Artificial Analysis Intelligence Index—a composite benchmark developed by Artificial Analysis, an independent AI model evaluation platform, to assess the overall intelligence of AI models—the models received the highest score of 66. By comparison, Claude Opus 5 (max) scored 63, while GPT-5.6 Sol (max) scored 61.
Anthropic describes the model as “the world’s most advanced model for coding and knowledge work,” adding that its research capabilities offer an early glimpse of how AI models may contribute to scientific progress. This is certainly something to look forward to.
I asked generative AI to conduct an in-depth analysis of Claude Fable 5.1 and Claude Mythos 5.1, and I invite you to read the results. Please note that this research and analysis were generated by AI based solely on publicly available information. They may not necessarily reflect the actual situation and may contain inaccurate information.

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