How Jev AI Works (and How to Use It in Production)

Decision models like Jev return a probability for every allowed answer instead of generating text, which makes them much faster and cheaper than asking a large language model.

I break down how Jev, OpenAI’s Decisions API, Cloudflare’s Clef and the open-source Kev score a question in one pass. Then I rebuild a production check in Mastra: picking the threshold with an eval, handling wrong answers and refusals with ClassifierProcessor, and switching providers without rewriting the logic.

This video is a paid partnership with Mastra.