# Kimi-K3: The 2.8-Trillion-Parameter Open Model That Beat Claude Fable at Frontend > Source: > Published: 2026-07-17 18:01:01+00:00 Member-only story # Kimi-K3 Beat Claude Fable at Frontend. The 2.8-Trillion-Parameter Weights Drop July 27 *It took #1 on the human-judged Frontend Code Arena over Claude Fable 5, yet loses to GPT-5.6 Sol on every static benchmark. That gap, on the largest open model ever built, is the story.* On 15 July 2026, the [Frontend Code Arena](https://x.com/arena/status/2077824029126504525) crowned a new number one: Kimi-K3, from the Beijing lab Moonshot AI, at 1,679 points, ahead of Claude Fable 5 and GPT-5.6 Sol. The jump is the part that should stop you. The previous Moonshot model, K2.6, ranked 18th. K3 went from eighteenth to first in a single release and topped six of the arena’s seven frontend domains, taking second only in Gaming, behind Fable 5. Per Arena’s announcement, it is the first open-weight model to hold the top spot on that board. Moonshot ships the [full weights](https://www.kimi.com/blog/kimi-k3) on 27 July. [Max](https://x.com/mweinbach) built a fully working Mac OS with Kimi-K3, which gives you a hint on how good this model is