Moonshot AI releases Kimi K3.1 Pro, a 3T-class open-weight model with 1M context
Moonshot
Moonshot AI released Kimi K3.1 Pro on October 24, 2026 (Beijing time), a 3T-class open-weight model with a 1,048,576-token context, alongside a K3.1 Pro Highspeed variant running 2-3x faster on roughly double the quota. Company-reported results: 65.7% on Terminal-Bench 4.0 against Claude Opus 5.5's 66.4% and GPT-6 Astra's 58.2%, 92.7% on BenchCAD with tools, and claim-level hallucination cut to 8.3% from K3's 23.4%. Full weights are promised by November 4, 2026, with cyber-related data stripped from mid-training and RL.
Why it matters
It is the strongest open-weight model out of China so far, and shipping weights within two weeks of launch keeps price and capability pressure on closed frontier labs.
Importance: 4/5
frontier-class open-weights release from a Chinese lab