classification models

At Dev Day, Sam Altman revealed OpenAI's new Decisions API, which narrows its Luna model to predefined choices for fast, cheap classification. The move closely mirrors Jev, a specialized decision model from startup TypeSafe AI released weeks earlier.

TypeSafe, founded by ChatGPT co-inventor Diogo Almeida, launched Jev on September 15, 2026 — a model that cannot generate free-form text but claims to classify, route, and score 20-200x faster and 40-400x cheaper than small frontier LLMs. Trained via a new method called RLCD, Jev targets production systems that use LLMs purely as structured judges or routers.