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On October 24, 2026, Arena added Kimi K3.1 Pro (Max) to the Agent Arena rankings, placing it at No. 11. The ranking is based on 4K multi-real-agent sessions, achieving a +7.6% net improvement, up 6 percentage points from Kimi K3 (Max)'s No. 25. Its median cost per task is $1.03, 13% lower than the previous version; it ranks No. 8, No. 9, and No. 10 in the Work, Code, and Chat categories, respectively. Arena said the model's open weights will be released soon, at which point it will become the top-ranked open-source model in Agent Arena, surpassing DeepSeek-v4.1-Flash. There are currently no subsequent developments.
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Kimi K3.1 Pro (Max) ranks 11th on Agent Arena, up 6 percentage points from Kimi K3Developments
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Oct 24
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Kimi K3.1 Pro (Max) ranks 11th on Agent Arena, up 6 percentage points from Kimi K3
Kimi K3.1 Pro (Max) ranks 11th in Arena's Agent Arena, achieving a +7.6% net improvement based on 4K+ real agent sessions, up 6 percentage points from Kimi K3 (Max)'s 25th place. Its median cost per task is $1.03, 13% lower than the previous version, ranking 8th, 9th, and 10th in the Work, Code, and Chat categories respectively. Arena stated that the model's open weights will be released soon, at which point it will become the top-ranked open-source model in Agent Arena, surpassing DeepSeek-v4.1-Flash.