Moonshot AI Open-Sources Kimi K3.1 Pro Weights, Tops Agent Arena Open-Source Model Leaderboard
Moonshot AI released the model weights of Kimi K3.1 Pro, which ranks 1st among open-source models and 13th overall on Agent Arena. Based on statistics from 17.5K+ real long-horizon agent sessions, Kimi K3.1 Pro (Max) shows a net improvement of +5.1%, ranking first among open-source models in all three categories of Work, Code, and Chat, and improving 4.2 percentage points over Kimi K3 (Max). In sub-scores, it ranks first among open-source models in Bash Reliability (+7.9%), Praise vs Complaint (+7.7%), and Steerability (+6.5%), and 4th among open-source models in Confirmed Success (+3.9%).
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SelectedAI score 71
Arena provides Kimi K3.1 Pro's ranking and sub-score changes in real long-horizon agent sessions, allowing comparison of its gap with K3.
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View original postReleasing the model weights of Kimi K3.1 Pro: https://t.co/tJXcYUeSCj We'll keep advancing open intelligence. https://t.co/BbWCJUYYSQ
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Releasing the model weights of Kimi K3.1 Pro: https://t.co/tJXcYUeSCj We'll keep advancing open intelligence. https://t.co/BbWCJUYYSQ
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Exciting news: @Kimi_Moonshot has released the open weights for Kimi K3.1 Pro, now #1 among open models in Agent Arena!
Across 17.5K+ real-world, long-horizon agentic sessions from our global community of users, Kimi K3.1 Pro (Max) delivers +5.1% net improvement, ranking #1 open and #13 overall.
It ranks #1 among open models in all three categories: Work, Code, and Chat.
This is a +4.2 percentage point improvement over Kimi K3 (Max), with +0.9% (#6 open). It also improved across all signals. Among open models, it ranks: - #1 in Bash Reliability (successful shell commands) with +7.9%: (up from K3 at #13 with −4.5%). - #1 in Praise vs Complaint (sentiment in user reactions) with +7.7%: (up from K3 at #6 with +1.3%). - #1 in Steerability (responding to user corrections) with +6.5%: (up from K3 at #5 with +0.4%). - #4 in Confirmed Success (explicit “yes, that worked” from users) with +3.9%: (from K3 at #5 with +3.8%).
Congrats to @Kimi_Moonshot on this contribution to the open ecosystem!