Arena ranks Claude Fable 5.2 #1 in Agent Arena, with a 30.4% net improvement

Arena says Claude Fable 5.2 (Max) takes #1 in its Agent Arena with what it calls an unprecedented lead: a net improvement of +30.4%, about 1.6 times that of the #2 model, Claude Opus 5.5. The result draws on 4.7k real-world agentic sessions from Arena's global community. Arena adds that Fable 5.2 is also #1 in its Code, Chat and Work categories.

These are Arena's own rankings. It had earlier placed Fable 5.2 #1 in Code Arena: WebDev.