Claude Fable 5.2 tops Agent Arena at +30.4%, 1.5x the gain of runner-up Opus 5.5
daniel_mac8 · x · 2026-11-12
Claude Fable 5.2 (Max) takes #1 on Agent Arena's Pareto frontier with a +30.4% net improvement at a median $7.3/task. Claude Opus 5.5 (Max) follows at +19.5% ($5.5/task), Gemini 4 Carbon (High) at +17.0% ($1.5/task), GPT-6.1-Sol (Max) at +12.5% and GPT-6.1 Terra (Max) at +10.8%. Fable 5.2 delivers over 1.5x the net improvement of Opus 5.5 at 32% higher cost, and roughly 2x the gain of Fable 5.1 at 6% lower cost.
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