Arena launches agentic router Max: frontier performance at 37% lower cost

arena · x · 2026-10-14

Arena released Max, an agentic model router for Agent Arena, with key facts:

Trained on 2.5M+ real-world Agent Arena sessions; routes requests by task complexity, cost, and type.
Ranked #1 in live Agent Arena testing: +14.7% net improvement at $3.27 median cost per task, beating the top public model Claude Fable 5.1 (Max) by 0.3 points at 37.5% lower cost.
The routing methodology generalizes across model combos: Fable 5 + Kimi K3 achieves +10.7% at $1.06 per task, outperforming Fable 5 (High) by 0.6 points while cutting cost 54%.
Arena tested 60+ agentic models over the past 4 months to map performance-cost trade-offs across chat, code, and work.
Max stays on the frontier as new models launch, suggesting the approach is model-agnostic.

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