Arena's Max Router Matches Claude Fable 5.1 Performance at 37% Lower Cost

Arena's Max agentic model router automatically selects the most efficient AI model for tasks based on output quality and price, matching Claude Fable 5.1 performance at 37% lower cost. Trained on 2.5M real-world agentic sessions, Max achieved a 14.7% net improvement score in internal benchmarks and reduced median task costs to $3.27 when routing between Claude Fable 5.1 and GPT 6 Astra. The tool also improved performance by 10.7% while cutting costs by 54% when pairing Fable 5 and Kimi K3, with Arena planning an API release after currently offering direct access in Agent Mode.