Kimi K3.1 Pro

Kimi K3.1 Pro is Moonshot AI's update to the Kimi K3 generation, available from 2026-10-23 in the Kimi apps and developer API. Mixture-of-Experts, 2.8T total / 104B active parameters, 1M-token context, native image input. Focused on multi-step coding, business-software tasks, repeated tool use and debugging. Pricing $2 / $10 per 1M input/output ($0.20 cached input), about a third below K3; a Highspeed variant (2-3x faster output) is $4 / $20. Moonshot promises full downloadable weights by 2026-11-04 (license terms not yet confirmed). Artificial Analysis: Intelligence Index 44 -> 55 vs K3 (4th at launch, behind Claude Opus 5.5 at 58), Terminal-Bench 4.0 13% -> 67%, AutomationBench-AA 58% -> 73%, HLE 47% -> 52%. Moonshot-reported claim-level hallucinations fell from 23.4% to 8.3%.