Jev case: A ChatGPT inventor built a model that doesn't
Covered TypeSafe AI's launch of Jev, a transformer that returns typed decisions rather than sentences, as an alternative to LLMs for running software.
The original post
A ChatGPT inventor built a model that doesn't speak Diogo Almeida helped invent RLHF at OpenAI, then got tired of models that crush language and still can't run software. His startup TypeSafe AI shipped Jev this week — a transformer that isn't an LLM. It doesn't write sentences.
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.
Related Jev cases
Keep browsing: all 1173 Jev cases · more from @Tesla_Optimus_K · builders · what Jev is
Last updated: 2026-09-22 · sources & corrections · every card links to its author's original post