Arena says Claude Fable 5.1 (Max) debuted at No. 1 on its agent leaderboard
Arena reports a $4.14 median cost per task for Anthropic's model, calling it both the highest-performing and most expensive model in Agent Arena.
TLDR
In its September 6 announcement, Arena ranked Anthropic's Claude Fable 5.1 (Max) first for performance but also called it the costliest model in Agent Arena, at a $4.14 median cost per task. Citing 6.7k-plus real-world agentic sessions, Arena said users praised it around twice as often as the next top model.
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