Builds & use cases

A live website showing the last trains in Tokyo, generated in a single pass and turned into a real site.

Rubzem built a three.js space game with over 80 uniquely generated planets to explore seamlessly, from one prompt.

500 emails for 3.5 cents: a triage & routing build posted by Riley Brown (@rileybrown) that puts Jev, TypeSafe AI's System One decision model, to work, with a demo video on the post.

Maubaron had Jev control all four fighters in a Smash Bros. match, choosing each move in a fraction of a second at a cost of a couple of cents.

A musician assessed the model's fugue, singling out the circle-of-fifths sequence at 1:13 as a standout moment of musical craft.

A Japanese creator chained GPT Images, Grok, Opus 5.5 and another model to turn a nine-panel dance sheet into a motion graphics piece.

Asked to depict its history from day zero, the model drew every frame as JavaScript brush strokes with no video model or images.

After Anthropic published its Functional Emotions paper, the creator had Claude write a song and then Opus 5.5 build the video for it.

Denis had Opus 5.5 build a 3D scene including a soundtrack and text-to-image assets in under an hour.

Max Blade put an Opus 5.5 game live on his server and let stream chat join in.

OpenAI's Sharif Shameem had Astra rebuild his favourite San Francisco landmark in Blender, using the 1914 World's Fair building to talk about restoring optimism about technology.

Opus 5.5 imagined and animated its own social feed, a playful self-portrait done in code.

Ivan asked for a no-text video visualising a big scam and got a wordless animated piece.

John Knopf asked the model to introduce itself however it wished and was struck by the sound and visuals of what it made.

Edwin Arbus's game about the first computer, with all visuals and audio procedurally generated in real time by the model.

A physics explainer built by Opus 5.5 that lets learners manipulate fields visually; its source is in the thebuggeddev repo.

Kevin Ngo asked Opus 5.5 to compose piano music and animate the performance with JavaScript drawing.

Broadcast pitting Astra against Claude Opus 5.5 to write the best StarCraft strategy code, tied to the StarSkirmish hillclimb benchmark.

Opus 5.5 produced a product launch video in about a minute for roughly two dollars, a job the author says used to take weeks.

Nader Dabit shared his first Jev experiment, a launcher that predicts your intent from each keystroke, as a sign of how many new apps become possible with sub-second decisions.