Kimi K3 Is the Largest Open-Weight Model Ever. Here's What Developers Need to Know.
Moonshot AI dropped a 2.8 trillion parameter open-weight model on July 16 — the biggest open model in existence, beating Claude Opus 4.8 on benchmarks, and undercutting frontier model pricing. The full weights drop July 27.
Moonshot AI released Kimi K3 on July 16 — a 2.8 trillion parameter open-weight model that sits 4th overall on the Artificial Analysis leaderboard, leads the Frontend Code Arena, and has weights dropping publicly on July 27. Here's what it is, how it performs, and why it matters for developers.