Kimi K3 took almost three hours to complete a 3D football stadium challenge, significantly longer than Claude Fable 5's under one hour, but performed end-to-end tests, validated across devices, and adapted for low-end hardware. Kimi K3 generated a clean React + Three.js codebase with proper components, unlike Fable 5 which produced a single large HTML file.
Kimi K3's focus on thoroughness and production-ready code, despite longer execution times, suggests a trade-off in agentic coding for higher quality outputs.