Kimi K3.1 Pro ranks fourth on Artificial Analysis, approaching Claude Opus 5.5
Chinese AI model Kimi K3.1 Pro is closing in on Anthropic's Claude Opus 5.5
- Who
- Artificial Analysis
- What
- ranks Kimi K3.1 Pro fourth on the Artificial Analysis Intelligence Index with a score of 55
- Quote
Chinese AI company Moonshot AI has released Kimi K3.1 Pro , a post-trained version of its predecessor Kimi K3 with significantly more post-training compute.
What happened
Moonshot AI released Kimi K3.1 Pro, which scores 55 on the Artificial Analysis Intelligence Index, up 11 points from K3 and 3 points behind Claude Opus 5.5. It is available through Kimi.ai, Kimi Work, Kimi Code, and the Kimi API, alongside a Highspeed variant that Moonshot says runs two to three times faster. Token prices fall 33 percent; if weights are released as planned by November 4, 2026, it could become the highest-scoring open-weights model, assuming rankings remain unchanged.
Why it matters
The benchmark comparison shows how a planned weights release could narrow the gap between open and proprietary models, while distinguishing independent measurements from company-reported results.
Read next
See the full storyMoonshot AI releases Kimi K3.1 Pro, placing fourth on Artificial Analysis Intelligence IndexReported by 3 sources
The story so far
Moonshot AI released Kimi K3.1 Pro, which Artificial Analysis ranked fourth on its Intelligence Index with a score of 55, up 11 points from Kimi K3 and three points behind Claude Opus 5.5. Artificial Analysis said the reasoning model made large gains in agentic performance. The model is available through Kimi.ai, Kimi Work, Kimi Code, and the Kimi API. Simon Willison reported API pricing of $2.00 per million input tokens and $10 per million output tokens. Moonshot says its Highspeed variant runs two to three times faster; Willison reported that it costs twice as much, except for input token cache hits, which carry the same price as the standard version. The weights are not yet open. Willison reported that Moonshot promised to release the full model weights by November 4, 2026. Artificial Analysis said Kimi K3.1 Pro would lead open-weights models once published, a position that depends on the release and rankings remaining unchanged.
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Model releases, price changes and compute developments, with original sources. Free, confirmed by email, and easy to unsubscribe. Read a past issue · 2026-10-23