Kimi K3: Moonshot ships a 2.8T open MoE for long-horizon coding

What it is — Moonshot AI’s release announcement for Kimi K3, a 2.8-trillion-parameter open Mixture-of-Experts model with native vision and a 1M-token context, aimed at long-horizon coding, knowledge work, and agentic tasks.

Key points

• Uses Kimi Delta Attention and Attention Residuals with a Stable LatentMoE routing 16 of 896 experts — billed as “the world’s first open 3T-class model.”
• Strong on kernel optimization, GPU compiler work, and complex software engineering; leads other open models on DeepSWE and Terminal-Bench, though still trails Claude Fable 5 and GPT-5.6 Sol.
• Available now via Kimi.com, the Kimi Work app, Kimi Code CLI, and the API; full weights land 27 July 2026.