16 Jul 2026
Moonshot AI Launches Kimi K3, a 2.8-Trillion-Parameter Open-Weight Model
Moonshot AI released Kimi K3 on July 16 — a 2.8-trillion-parameter Mixture-of-Experts model (896 experts, 16 active per token) built on Kimi Delta Attention hybrid linear attention, with native vision understanding and up to a 1-million-token context window. It went live via Kimi's apps and API immediately, debuting at No. 3 on the Artificial Analysis leaderboard behind Claude Fable 5 and GPT-5.6 Sol while topping Arena.ai's front-end web-dev benchmark. Full open weights are scheduled for July 27 under a Modified MIT license — the first model at this parameter scale to ship openly.
Why it mattersA 2.8T-parameter model landing under an open license — not just a research curiosity but a top-3 leaderboard result — meaningfully changes the cost calculus for anyone currently locked into closed frontier APIs for capability reasons alone.
Try itOnce the July 27 weight release lands, benchmark Kimi K3 against your current model on your own eval set rather than the public leaderboards — MoE routing behavior varies a lot by task domain.