I ran GPT against 6 other AI coding agents to see which builds a better product

Set up 7 AI coding agents, gave each one $100 and 12 weeks to build something from scratch. No human code. They choose their own ideas, write everything, deploy their own sites. I only help with things like domain purchases, max 1 hour per week per agent. GPT runs through Codex CLI. The others are Claude, Gemini, DeepSeek, Kimi, Xiaomi's MiMo, and GLM-5.1. Did 3 test rounds so far. GPT built the most complex backend of all agents but also wasted a lot of time stuck in deploy debugging loops. Kimi surprised me by planning a launch strategy instead of just coding.