Ask for one word, get an essay
You only need AI to answer with one word, but it writes a whole paragraph. That's slow, and it costs money.
Software only needs one choice
Lots of tasks only need AI to pick one of a few ready-made answers. Refund, exchange, or price question?
Decision models
That's a decision model. You give it a question and a list of answers, and it picks just one, with how sure it is.
SEP 15, 2026
Jev leads the way
In mid-September 2026, a company called TypeSafe launched Jev, a model that does only this job, very fast and very cheap.
SEP 29, 2026
OpenAI joins in
Two weeks later, OpenAI introduced the Decisions API. OpenAI says it picks an answer in about 0.15 seconds, almost ten times faster than a normal reply.
Why does it matter?
AI agents have to make hundreds of small decisions every day. When each decision is faster, the whole system gets faster and cheaper.
This article is based on the video Jev and OpenAI's Decisions API: AI that picks instead of writes from the Mark học AI channel. Watch the video (in Vietnamese) to see the animations.