Kimi K3: Open 2.8T Frontier Model for Long-Horizon Coding and Knowledge Work
Moonshot AI releases Kimi K3, a 2.8T-parameter open model built on Kimi Delta Attention (KDA) and Attention Residuals (AttnRes), activating 16 out of 896 experts with a reported 2.5× scaling efficiency improvement over K2. It supports native vision and a 1M-token context window. While generally trailing top proprietary models like Claude Fable 5 and GPT 5.6 Sol, K3 achieves competitive scores on coding, knowledge work, and reasoning benchmarks. The post details case studies: GPU kernel optimization, a from-scratch Triton-like compiler (MiniTriton), 3D open-world game development, autonomous chip design (48-hour run), and rapid scientific research reproduction. K3 is available now via Kimi.com, Kimi Work, Kimi Code, and API; full weights open-sourced by July 27, 2026. Recommended for AI engineers, agent developers, and researchers needing long-horizon agentic capabilities.