Kimi K3 in prerelease: Moonshot's largest open-weight release, a 2.8T-parameter mixture-of-experts with a 1M-token context window and native vision, built for repository-scale code understanding and multi-step agentic work. It thinks by default at maximum reasoning effort; select none, low, high, or max to trade depth for speed. While we scale capacity, access is seat-gated through the Labs page, and availability is limited: expect occasional errors during the ramp. For production work today we recommend umans-coder or umans-glm-5.2.