Reactiondiff
Reaction-Diffusion — Turing pattern generator.
What I asked each model — the Reactiondiff prompt
Every model on this page got this exact prompt inside the Agent Operating System: Reaction-Diffusion — Turing pattern generator.
Single HTML file out. No iteration. No examples in the system prompt. Whatever each model produced on the first run is what's on this page. 2 frontier models have attempted it so far: GLM-5.2, Opus 4.8.
Why this task matters. Reactiondiff is a textbook test of sim-class capability — the kind of build that exposes whether a model is doing pattern-matching or actual reasoning. Shipping this cleanly is the floor for what I expect from a frontier model — every model on the leaderboard should at least attempt it.
How each model handled Reactiondiff
Ranked by my 0–10 score from the source comparison guides on agentos.guide. Click any to play the actual one-shot HTML the model produced.
Demo on the bench. Not scored yet — play it and form your own opinion.
Demo on the bench. Not scored yet — play it and form your own opinion.
Every attempt — live, playable
Side by side. Click any tile to run that model's actual one-shot HTML in a new tab.
How I scored Reactiondiff — methodology
Three axes, 0–10 each, averaged. Runs: drop the .html in a browser; if it opens to a broken page, it scores zero. Hits the brief: did the model ship the thing the prompt asked for, or a different thing it found easier. Looks good: visual polish, motion, interactivity — where most of the gap between gold and silver lives.
My scores trace back to the source comparison guides on agentos.guide. See the full methodology page for data provenance, including which source guide each cell's score came from.
Related
More sim benchmarks: all tasks in the Sim category · See the best AI model for Reactiondiff · Back to the leaderboard
Run this stack yourself.
Every demo on this bench was built inside the Agent Operating System — one prompt, one shot, single HTML file out. The Agent OS, the prompts, the templates, the weekly walkthroughs and 3,600+ founders shipping with it every day all live inside the AI Profit Boardroom.