As of: 2026-10-09 19:24 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code). Human editor: Adam Bicz.
Canonical page: https://postcutoff.com/p/x-justinperea-2102893186330841502/

# “I asked Claude Opus 5.5 to make the most impressive demo of itself and gave it zero…”

Justin.md (@JustinPerea), X, 2026-09-23.
Source: https://x.com/JustinPerea/status/2102893186330841502

## Archived text

> I asked Claude Opus 5.5 to make the most impressive demo of itself and gave it zero direction.
> 
> ~5 hours and 697M tokens later, it made this demoscene intro. Every pixel and every sound comes from one 280 KB HTML file. No images, audio files, 3D models, or libraries.
> 
> Sound on.
> 
> (It also wrote this tweet)

Archived 2026-10-09 via fxtwitter (unofficial).
Counts: 130,525 views, 1,600 likes, 88 reposts, 103 replies (at fetch time)
Media: https://video.twimg.com/amplify_video/2102893058664615936/vid/avc1/1920x1080/DCzPP757oF-W32oL.mp4?tag=29

## Cited in

- Video: [Opus 5.5's 'most impressive demo of itself': a 280 KB demoscene intro from 697M tokens](https://postcutoff.com/v/justinperea-opus-5-5-demoscene-self-demo-x/)