JevMade field notes / Video guide

JEV: How It Works and What You Can Build

Riley Brown explains TypeSafe's Jev decision model, demonstrating its structured outputs (choice, score, Noul) and showcasing practical applications in routing and email classification.

Original by Riley BrownGetting startedBeginner20 min 18 sec Published 2026-09-18Source reviewed 2026-09-26

Before you press play

What you’ll find in the video

Jev reads the supplied state and returns a Choice, Score, or yes-or-no probability instead of a written answer.
The pricing discussion focuses on input-token charges and the limits of the model version shown; confirm current limits before implementing it.
Riley surveys routing, browser, and trading demonstrations as uses of fast decisions, not evidence that each application is reliable or profitable.

Worth knowing

Gemini-assisted video/transcript review. Quoted latency and cost comparisons (e.g. 0.4s and $0.0004 per decision) derive from vendor marketing claims rather than independent third-party benchmarks, and trading demos pose substantial financial risk.

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