Kimi K3 Just Made Open-Weight the Real Contender

July 16 — Kimi K3 jumped #23→#4 on Agent Arena, matching Opus 4.8 & Sol. #1 task success, +20.6% praise ratio across 8K+ sessions. 2.8T MoE, ~2.5x vs K2. Weights July 27 — then it's the #1 open model. What's your first project on K3?