Kimi K3, a 2.8T parameter model from Moonshot AI, scores 57 on the Artificial Analysis Intelligence Index and has an Elo of 1543 on the AA-Briefcase benchmark, making it second only to Fable 5. Kimi K3 costs more to run than Opus 4.8 and averages nearly an hour per task, showing a +727 improvement over Kimi K2.6.

Kimi K3 is an open model that offers competitive performance with Fable 5 at a lower cost. When combined, Kimi K3 and Fable 5 achieve state-of-the-art results across approximately 1,030 agentic tasks.