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TypeSafe Jev · 15 September 2026

Jev builds on X

TypeSafe left stealth on 15 September 2026 with Jev. 13 first-party ships we cataloged, each with the original post.

Diogo Almeida, who worked on InstructGPT at OpenAI, trained Jev with RLCD, Reinforcement Learning for Calibrated Decisions. The model cannot write a sentence. It scores choices. Input is $0.042 per million tokens. Output is free. That is the whole pitch, and people started wiring it into crawlers, code review, and trading bots the same week.

Official note: Introducing System One Models and Jev. Waitlist: typesafe.ai. Announcement: the original post.

Jev, in short

What is Jev?
Jev is TypeSafe AI's first public System One model, released 15 September 2026. You send a structured question and get a typed choice, score, or probability. It does not generate prose.
How is Jev different from ChatGPT or Claude?
Those models write tokens one at a time. Jev answers in parallel and is not a chatbot. TypeSafe prices input at $0.042 per million tokens and lists output as free. Their own workflow numbers are 20 to 200 times faster than an LLM on decision tasks. We have not re-run those benches.
Where do I get access?
Waitlist and docs are on typesafe.ai. The launch note is on the TypeSafe blog. Diogo Almeida posted the announcement on X.
What counts as a Jev build here?
A public URL or repo posted on X by the person who made it. Joke wrappers and is-even demos stay off the list.
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