Moonshot AI releases open weights for Kimi K3.1 Pro flagship model
Moonshot AI has published the weights of Kimi K3.1 Pro, a 2.8T-parameter flagship released as an API on 23 October 2026, fulfilling a launch promise on 4 November 2026. The post-training overhaul nearly ties Claude Opus 5.5 on agentic coding.
Lead source: Techmeme