Kimi K3.1 Pro
Moonshot AI releases Kimi K3.1 Pro, a 3T-class open-weight model with a one-million-token context window, plus a Highspeed version running 2-3 times faster. Available on Kimi.com and the API, with full weights due by November 4, 2026.
What the article says
Moonshot AI has introduced Kimi K3.1 Pro, the first model in its new K3.1 series, an open-weight 3T-class model with a 1-million-token context window, along with a Highspeed variant said to run 2-3 times faster. Both are available on Kimi.com, Kimi Work, Kimi Code and the Kimi API; full weights are due by November 4, 2026.
K3.1 Pro is a post-trained version of K3 with substantially more compute, notably reinforcement learning. Moonshot reports 65.7% on Terminal-Bench 4.0 and a drop in hallucination rate on a deliberately hard stress test from 23.4% to 8.3% versus K3. It says it removed cyber-related data from training for the open release and that its cyber capability remains behind frontier proprietary models. Some results come from internal benchmarks.
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