Describe what you want and it's live in about three seconds. Then keep talking to change it.
Recorded in real time, no cuts.
Each build in the video took under five seconds.
Want a dark mode or another section? Just say so. Earlier versions are one click away.
Publish it at a link, or download it as a single HTML file.
The model runs on Cerebras chips, which keep it in on-chip memory instead of fetching it piece by piece. And there's no build step, so your browser runs the result as soon as it's written.
We timed 1two3. The other two are worked out from Artificial Analysis output speeds (141.2 and 43.7 tokens/s, October 2026), which don't count the wait for the first token. Ours does.
We launched LampBuilder in 2023 to turn a sentence into a startup landing page. 1two3 does the same for websites and apps, only much faster. It's the same team with a new name.