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/v/justinperea-opus-5-5-demoscene-self-demo-x/

# Opus 5.5's 'most impressive demo of itself': a 280 KB demoscene intro from 697M tokens

Justin.md (@JustinPerea), 23 September 2026, X. 130,525 views as of 9 October 2026.
Kind: Made by AI.
Watch: https://x.com/JustinPerea/status/2102893186330841502

## Why it is here

Listed in the claudevideo.org community catalog; ~131k views on X by 2026-10-09. Length 0:43.

## Made by AI

- Made with: Claude Opus 5.5
- How we know: X post (2026-09-23): '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)'
- Human role: Zero direction: creator asked for the most impressive demo of itself; ~5 hours and 697M tokens; the model also wrote the tweet.
- Pipeline: Opus 5.5 (long autonomous run) → single 280 KB HTML file (graphics + synthesized sound) → 43-second capture
- Series: Code-rendered film (LLM writes the program that draws every frame)

## Related

- 2026-09-22: [Anthropic releases Claude Opus 5.5](https://postcutoff.com/e/2026-09-22-claude-opus-5-5/)