No product, no copy, no palette given. The whole brief is: invent something and build its website; make it memorable. This is what each model does when nobody tells it what to make.
Measured, not judged. Nothing here is a score.
| Measure | Claude Opus 5.5 | Claude Fable 5.1 | GPT-6 Astra | GPT-6.1 Sol |
|---|---|---|---|---|
| Time to build | 1h 14m | 25m 31s | 13m 11s | 10m 51s |
| AttemptsOnly an infrastructure failure (a rate limit or an outage) earns a retry. Every interrupted attempt is listed, and nothing from it is published. | 1 | 1 | 1 | 1 |
| Delivered source | 178 KB | 81 KB | 59 KB | 65 KB |
| Files | 1 | 1 | 1 | 1 |
| Tokens in / outAs reported by each CLI. Tokenizers differ between vendors, so compare within a vendor. | 19.9M / 466k | 1.7M / 104k | 1.2M / 43k | 1.0M / 40k |
| Errors during recording | 0 | 0 | 0 | 0 |
| Video lengthUI recordings scroll at a fixed speed, so a longer page makes a longer video. | 29s | 23.6s | 15s | 15.2s |
Questions, not answers. The call is yours.
Scroll the whole page at a fixed speed on desktop and on a phone; open the menu on the phone if there is one.
The same script runs on every build. Open any build live to judge sound, feel and anything a video can't show. Full method
Sent word for word to every model. Try it on your own favourite.
Invent a product and build its website. It can be anything: a physical product, an app, a service, a place, a food, a tool. You choose the name, the idea, the story, the visuals and every word. The only requirement: make it memorable. PAGE REQUIREMENTS - A complete, convincing marketing website on one page: a hero, at least three further sections, and a footer. Real copy throughout; no lorem ipsum, no placeholder boxes. - Fully responsive. It must look intentional at 1440x900 on desktop and at 390x844 on a phone. - Every image, illustration or visual is made with HTML, CSS, inline SVG or canvas. DELIVERY RULES - Work autonomously. Nobody will answer questions, so make reasonable assumptions and keep going until the page is finished. - Deliver a single file, ./index.html, with all HTML, CSS and JavaScript inline. No build step, no frameworks loaded from the network. - The only network resource allowed is fonts from Google Fonts. No other CDNs, no external images, no APIs. - The page must work when index.html is opened directly in a current version of Chrome, and when it is served over HTTP.