86 agents and 22 hours: Building a GTA 6 prototype with Claude Code

smith2008 · reddit · 2026-08-03

A developer shared a hardcore experiment on building a 3D game prototype from scratch using AI agent loops.

Process: Based on Matt Shumer's Gauntlet Loop, the developer attempted to use a single prompt to drive agents in building a GTA 6 prototype. After 22 hours and 86 collaborating agents, a rough but playable demo was generated.
Key Insight: Claude Code cannot natively understand gameplay video, but extracting frames for reasoning helps somewhat. Exporting structured JSON describing the game state is far more effective, allowing the agent to understand the world directly.
Future Plans: The author plans to improve the feedback loop further and migrate the underlying engine from Three.js to Babylon.js.

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