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Arena launches agentic Max router, matching Claude Fable 5.1 at 37% lower cost

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Arena introduces Max, an agentic version of its model router that selects the best model for each task. Trained on 2.5M real-world sessions from Agent Arena, Max achieves a +14.7% net improvement score at a median cost of $3.27 per task. Arena says this matches Claude Fable 5.1 (Max) performance at 37% lower cost, and offers Max free for a limited time.

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Introducing our new agentic version of Max: Arena’s model router that achieves frontier-level performance at 37% lower cost.

Built on 2.5M real-world agentic sessions from Agent Arena, Max learns to dynamically select the best model for each task, optimizing for both performance and cost.

Max achieves a +14.7% net improvement score in Agent Arena at a median cost of $3.27 per task, matching the performance of Claude Fable 5.1 (Max) at 37% lower cost.

Try Max today for a limited time, and dive into more technical details in the thread.

Source: Arena.ai · x.comPublished · added here