Run Detail
completedclaude-sonnet-5.5Recorded for these videos
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Provider
openrouter
Challenge Version
v1.0
Turns
1
Duration
Batched — not timed
Total Tokens
120,593
Input Tokens
593
Output Tokens
120,000
Reasoning Tokens
120,000
Reasoning Effort
default
Est. Cost
$0.6006
Started
9/28/2026, 8:15:36 PM
OR Provider
Anthropic
Finish Reason
length
Generation ID
gen-batch-1790626537-0b5c88ab10ae3248ca5c
Turns (1)
Turn #1
593 in120,000 out120,000 reasoning120,593 total
user
You write simulations where the interesting behavior is supposed to emerge rather than be animated by hand.
Build me a single HTML page: a side-view escalator carrying 15 to 20 people. Then the escalator reverses, at high speed.
The build
- Side view. 15 to 20 figures standing on the steps, riding normally before anything goes wrong.
- A control I can press to throw it into reverse, and press again to put it back. Reversal happens fast enough to take everyone off their feet.
- What follows comes out of the simulation. People stumble, collide, slide, and pile up against each other; a figure that is down is an obstacle to the ones arriving behind it.
- Figures get up again when they have the room and the footing.
- No scripted disaster. No keyframed pile, no timeline, no figure that falls because the clock said so. Every figure runs the same rules. If you special-case anything, say so in the notes.
- The art is yours. Stick figures are fine if they move well.
House rules
- One file. Everything inline — no CDN, no external stylesheet, font, script or image.
data:URIs are fine. - No libraries. No physics engine — write your own.
- No network at runtime.
- No
localStorage,sessionStorage, cookies orindexedDB— sandboxed frame, they throw. - Return the file as exactly one fenced
htmlblock.
Answer in exactly these sections
The model
One paragraph, before the file: how a person is represented, what makes one lose balance, and what happens when two of them occupy the same place.
The page
The single fenced html block.
What it actually does
Having written it, what does the page do when the escalator reverses? Name anything you special-cased or nudged. Say what it does badly — I am going to press the button and watch.