@a1exstone explains Jev as a System One model: send state and questions, get typed answers with probabilities, with questions evaluated in parallel. They recount a two-turn agent loop where six of eight decisions (pick a model, screen a tool call, check if done) cost 0.06s combined, and cite TypeSafe figures of 20–200x faster and 40–400x cheaper on classification.

Alex Stone (@a1exstone) published this on 2026-09-18. @a1exstone explains Jev as a System One model: send state and questions, get typed answers with probabilities, with questions evaluated in parallel. They recount a two-turn agent loop where six of eight decisions (pick a model, screen a tool call, check if done) cost 0.06s combined, and cite TypeSafe figures of 20–200x faster and 40–400x cheaper on classification. TYPESAFE RELEASED A MODEL THAT DOESN'T GENERATE TEXT, AND IT BREAKS THE COST FLOOR OF THE AGENT LOOP jev is what they call a system one model. How Jev or TypeSafe is used, in the post's own words: “TYPESAFE RELEASED A MODEL THAT DOESN'T GENERATE TEXT, AND IT BREAKS THE COST FLOOR OF THE AGENT LOOP jev is what they call a system one model.” The post does not name a separate audience. It is for people reading what @a1exstone shows here (it quotes @sydneyrunkle; it includes media).