Jev has been trending for a few days, and I only just found
Explained that Jev is not a chat model but a structured-judgment model trained with RLCD, returning decisions with confidence for software automation.
The original post, translated
Jev has been trending for a few days, and I only just found out. Am I behind the times? ChatGPT co-inventor Diogo Almeida has a new model, Jev. Made by TypeSafe AI. To be clear first: Jev is not a chat model. It specializes in structured judgment, for software automation. In the video it's called System One. Training switched to something called RLCD, not RLHF. The comparison is very direct. On the left, Jev spits out with confidence
Show the original post in its source language ▾
Jev 火了几天, 我才知道了, 是不是落伍了 ChatGPT 共同发明人 Diogo Almeida 出新模型 Jev。TypeSafe AI 做的。 先说清楚：Jev 不是聊天模型。专做结构化判断，给软件自动化用。片子里叫 System One。训练换了套叫 RLCD，不是 RLHF。 对比很直。左边 Jev 一下吐出带置信度的
The post above is a machine translation from zh; the untranslated text is in the fold-out.
Engagement when collected
Numbers are a snapshot taken from X when the case was added to the library (schema v1, collected 2026-09-19); they will not match today.
Where this case fits
Filed under general Jev builds. In the pattern Jev is built for, the model answers a bounded question per step — and ordinary code acts on the answer, because the answer is already a value rather than a paragraph. Browse the full case library for the work it sits next to.
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Last updated: 2026-09-22 · sources & corrections · every card links to its author's original post