Webos

What I asked each model — the Webos prompt

Every model on this page got this exact prompt inside the Agent Operating System: Web-OS Desktop — a working desktop with windows, dock, Notes / Paint / Terminal apps.

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. 5 frontier models have attempted it so far: Fusion, Grok, Kimi K2.7, MiniMax M3, GLM-5.2.

Why this task matters. Webos is a textbook test of page-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 Webos

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.

The winner on Webos

Fusion took gold on this task. winner · most ambitious app.

What I saw: A tiny working desktop OS in 24KB — wallpaper, taskbar dock with app icons, draggable resizable windows for Notes, Paint, Terminal (echo-only), Calculator. Apple-Sequoia aesthetic. Most ambitious application build on the bench.

See Fusion's full model card: /models/fusion.

How I scored Webos — 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 page benchmarks: all tasks in the Page category · See the best AI model for Webos · Back to the leaderboard