Kimi K3 vs Claude Opus 5: An Open Model Takes On 3D World Generation

Claude Opus 5 won on polish and physics but burned ~20% of a weekly Claude quota (~$10); open-weight Kimi K3 via the Klein harness delivered a usable 3D world at a fraction of the cost. Kimi K3 self-corrected across iterations — pulling buildings closer to the reference image — in a test running seven sub-agents plus an orchestrator.