Moonshot launches Kimi K3.1 Pro with weights planned

Moonshot AI has launched Kimi K3.1 Pro, an upgraded version of its Kimi K3 model, and says it will publish the new model’s full weights by November 4, 2026. The model is available through the company’s services, with a faster variant called Kimi K3.1 Pro Highspeed also offered. Moonshot says Highspeed runs two to three times faster than the standard version. The company reports that Kimi K3.1 Pro scored 65.7 on TerminalBench 4.0, a benchmark of AI coding agents performing programming tasks. That is just below Claude Opus 5.5’s 66.4 and above GPT-6 Astra’s 58.2, according to Moonshot. The reported results are company figures and have not been independently checked. Moonshot also reports a score of 92.7 on BenchCAD, which tests 3D modeling through code generation. On that test, Claude Opus 5.5 scored 96.2 and GPT-6 Astra scored 95.9. The company says the model can generate 3D assets and work on projects involving game engines, as well as support financial analysis and longer, multistep coding tasks. On Moonshot’s internal Kimi Hallu Bench Hard evaluation, the claim-level hallucination rate fell to 8.3% for Kimi K3.1 Pro from 23.4% for Kimi K3. The company cautions that the...