How I Built a System One Option Scorer like Jev Scott Davis · Hecaton Labs · September 2026 On September 15, 2026, TypeSafe AI came out of stealth and released Jev, its first System One model, into early access. Jev is not a chatbot. It takes a situation (state), scores a short list of allowed moves (options), and returns a structured choice software can act on. No essay. No tool-call monologue. A decision.