Made with Jev

Everything here is made with Jev — the same typed, calibrated decision that returns one key, a probability for every option, and a confidence score in a single round trip. Open any of them, then build your own.

Jev is TypeSafe AI's first System One model. Instead of free text you have to parse, a call to Jev returns a locked, typed answer: one of the classes you defined, calibrated probabilities across all of them, and a confidence value — in roughly 70–500ms for about $0.001 per decision. The demos below are all made with Jev through the same hosted endpoint you get with a key, so what you see is exactly what you can ship.

Tools made with Jev

Games made with Jev

The games are the same primitive turned into an opponent or a referee: every move is a typed Jev decision, so you can watch a calibrated model reason under real constraints.

Make something with Jev

Grab a jv_live_ key and hit POST https://jevtypesafeai.com/api/v1/decide (or the official POST https://api.typesafe.ai/v1/systemone). Define your options, send the state you want a decision on, and you get back a typed answer you can act on immediately — no parsing, no invalid labels, no retries. That is all any tool or game on this page does.

See also: All tools · All games · What is Jev