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Claude-fable-5.1-max will be the top model on arena.ai's Text Arena (Overall) on September 14, 2026. Anthropic released Claude Fable 5.1 and Mythos 5.1 on September 1, 2026, and the 5.1-max variant scored 66 on the Artificial Analysis Intelligence Index. The model also logged 1,853 Elo on GDPval-AA…