JEV: How It Works and What You Can Build
Riley Brown breaks down Jev, a decision-making AI model from Typesafe that classifies and routes but never generates text, covering three practical use cases and key technical details.
The gist
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Jev only returns structured decisions like a choice, score, or probability, so you pay no output token costs.
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It processes decisions in about 0.4 seconds at $0.00004 each, compared to 10 seconds and $0.03 for a typical LLM.
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You can use Jev to route requests to the right model based on complexity, sending simple queries to a cheap model and hard ones to a frontier model.
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Access Jev through the Vercel AI Gateway API, or give an LLM like Claude or Codex the Jev docs and your API key to build an app automatically.
Riley Brown uses it
"What Jev is made for is to make really fast, high-quality decisions for incredibly cheap. I'm going to monitor everything — the same way that I just set up my emails. I was able to monitor every email and categorize it and create a level of urgency. You can basically monitor e..."
▶ Play at 3:485 creators recommend it, including Claire Vo, Jason Lemkin, and Greg Isenberg.
See all on the Jev page
Riley Brown uses it
"I just had Claude create this app for me that uses Jev. I created this in a single prompt using Claude."
▶ Play at 0:38250 creators recommend it, including Chris Koerner, This Week in Startups, and Peter Yang.
See all on the Claude page
Riley Brown recommends it
"The model itself is on the Vercel AI gateway. You basically want to go to Vercel and then down here you have your AI gateway and you want to get your API key for this AI gateway because this model Jev is actually on the AI gateway. So if you get the AI gateway key, you can lit..."
▶ Play at 19:142 creators recommend it, including Claire Vo.
See all on the Vercel AI Gateway page
Riley Brown uses it
"If you get the AI gateway key, you can literally go to Claude or Codex. I normally use Codex. I'm just out of credits on Codex. And you can just say, 'Hey, I want you to create an app that uses Jev.'"
▶ Play at 19:3297 creators recommend it, including Claire Vo, Dan Shipper, and John Coogan.
See all on the Codex pageWhat they recommend · 4 picks
"What Jev is made for is to make really fast, high-quality decisions for incredibly cheap. I'm going to monitor everything — the same way that I just set up my emails. I was able..."
"The model itself is on the Vercel AI gateway. You basically want to go to Vercel and then down here you have your AI gateway and you want to get your API key for this AI gateway..."
"I just had Claude create this app for me that uses Jev. I created this in a single prompt using Claude."
Riley, Greg, Peter and Claire agree on 45 things
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