Moonshot AI's open-weight Kimi K3 tops Arena coding leaderboard

Kimi K3 is #1 among open-weight models on the Agent Arena with +9.75% net improvement (vs GLM-5.2 Max's +7.12%) and tops Frontend Code at 1682 points. It scores 57 on the Artificial Analysis Intelligence Index, on par with Opus 4.8 and GPT-5.6, and ranks #2 on the Vals Index, surpassing GPT 5.6 Sol.