HE SPENT $300 MAKING TWO AIs BUILD GTA 6 BEFORE ROCKSTAR DOES

GPT-6 Astra against Claude Opus 5.5. Same prompt, same reference pictures, same tools: Unreal Engine 5.8 plus the Tripo AI plugin for 3D models. No browser cubes, no fake demos. A real 3D open world game.

GPT-6 Astra worked through Codex, Opus 5.5 through Claude Code. Each one got its own shot at building the whole thing from scratch.

Then he actually played both games. Police chases, wanted stars, guns, ragdoll physics, car tuning, missions. The full checklist of what makes GTA feel like GTA.

The question underneath is bigger than which model wins. Can vibe coding really produce an open world game in Unreal Engine, or does it fall apart the moment you stop looking at a trailer and start driving?

$300 in AI spend to find out. You'll have to watch the video to see whether it was worth it.