Every app you’ve ever built needs to make small decisions constantly. Is this support ticket urgent? Which department should handle it? Is this search result actually relevant to the query? Should this comment be flagged for review? For years, developers have solved this with either brittle if-statements and regex, or by bolting on a full LLM call that’s slow, expensive, and returns free text you then have to parse and hope is valid JSON.
In September 2026, a new company called TypeSafe AI released Jev, the first model in a category it calls “System One models” – AI built specifically to sit inside your code and answer exactly this kind of question. No chat interface. No generated paragraphs to parse. You describe the shape of the answer you want, and Jev returns a typed, calibrated decision your code can act on immediately.
This course is your complete, hands-on guide to understanding, testing, and building with Jev – whether you just want to know what all the fuss is about, want to click around the console and see it work, or want to wire it into a real application.
