One prompt ran Claude Code for 3h10m to build a music-synced 1990s demoscene demo
gandamu_ml · x · 2026-09-24
- The event: Developer gandamuml generated a 1990s-style demoscene demo with a single prompt in Claude Code (Opus 5.5, 1M context, effort xhigh), scored with "Unreal ][" by Purple Motion / Future Crew (1993, Second Reality) in S3M format.
- Result: The session ran for 3 hours and 10 minutes. For comparison, the author's Minecraft port took hundreds of prompts — this one truly was one-shot.
- Reproducible: The full prompt is public (Pastebin, 49KB session log). Key prompt design: have the model first analyze the S3M track to sync effects with musical sections, research suitable demoscene effects and physics upfront, target C/C++ + OpenGL with fast-compile discipline, and motivate it to polish by "showing off to the world."
- Corroboration: Purz reproduced something similar using Astra, showing the approach transfers.
Related event: Claude Opus 5.5 one-shot demoscene demo sparks buzz and doubt(16 posts)→
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