Kimi K3 took first place on frontend coding at a third of the price, and the licence has a catch

tldr: Moonshot AI’s Kimi K3 took first place in the Frontend Code Arena, ahead of Claude Fable 5 and GPT-5.6 Sol. The API costs (3 per million input tokens and )15 per million output, which is 30% of Fable 5’s rate. The open weights landed on 27 July 2026, under a custom licence rather than MIT or Apache: Model-as-a-Service businesses past $20 million in revenue need a separate agreement with Moonshot before commercial use.