Rainbow Slinky on an Escalator: GPT Wins on Speed, Claude Wins on Physics Realism
shniydder · reddit · 2026-09-05
- Inspired by the 'pelican on a bicycle' test, the author designed a 'rainbow slinky tumbling forever down an up-escalator' challenge: a single HTML file, canvas only, no libraries, comparing both models side by side.
- GPT 6 Astra max: fast and light on the weekly usage quota, but output felt too simple — with a physics bug where the slinky passes through itself.
- Claude Fable 5.1 max: passed the eye test with surprisingly realistic motion, but burned through the entire 5-hour usage window and once errored out at the output token limit.
- Verdict: Claude wins on quality, GPT wins on speed. The author shares the full prompt and invites better test ideas.
Related event: Rainbow Slinky Escalator Test Goes Viral, Pitting GPT Against Claude(2 posts)→
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