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/kevin-t-ngo-opus-5-5-piano-composition-x/

# Opus 5.5 composes piano music, with an animation drawn in JavaScript

Kevin Ngo (@kevin_t_ngo), 25 September 2026, X. 137,207 views as of 9 October 2026.
Kind: Made by AI.
Watch: https://x.com/kevin_t_ngo/status/2103482164193165711

## Why it is here

Listed in the claudevideo.org community catalog; ~137k views on X by 2026-10-09. Length 0:45.

## Made by AI

- Made with: Claude Opus 5.5
- How we know: X post (2026-09-25): 'I asked Claude Opus 5.5 to compose piano music.  Animation drawn using JavaScript.'
- Human role: Creator asked Opus 5.5 to compose piano music; animation also by the model.
- Pipeline: Opus 5.5 → code-synthesized piano + JS animation → 45-second clip
- 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/)