Three-paragraph prompt is enough... Claude Opus 5 builds FPS game two days after launch

Anthropic’s Claude Opus 5 reportedly built a playable browser FPS from a three-paragraph prompt with no external assets.

The demo, shared by investor Matt Shumer, used a multi-agent workflow and repeated critique loops to refine the game.

Similar experiments were later reproduced by others with different models and longer runtimes, suggesting the approach can scale.

The case boosts interest in agentic coding, but also raises questions about evaluation, reproducibility, and benchmark contamination.