Moonshot AI Releases Kimi K3.1 Pro, an Open-Weight Model Matching Frontier AI Performance at Lower Cost

Moonshot AI released Kimi K3.1 Pro on October 24, 2026, a 2.8-trillion-parameter open-weight model designed to deliver frontier-level performance at significantly reduced cost compared to proprietary alternatives. The 3T-class model features 104 billion active parameters through a mixture-of-experts architecture, a 1-million-token context window, and native multimodal capabilities including text, image, and video understanding. Full model weights are scheduled to become publicly available by November 4, 2026.