TypeSafe AI's Jev now available on AI Gateway
193.6x faster, 444.6x cheaper. TypeSafe's Jev decision model is now live on Vercel's AI Gateway—typed answers without the text generation tax.
Why it matters
Jev replaces token-by-token LLM generation with parallel probabilistic evaluation for structured decisions. Practitioners building agents or guardrails can now route uncertain cases to review while automating high-confidence paths—a meaningful efficiency gain for production workflows.
The key facts
12 to knowJev available on Vercel AI Gateway as of Sep 16, 2026
193.6x faster and 444.6x cheaper than LLMs on workflow evaluations (TypeSafe claim)
Returns typed Choice, Score, and Boolean answers with confidence/probability scores
Integrated into AI SDK 7.0.105+ via experimental evaluate API
Supports zero data retention and no training on user data
Use cases: agent subagent selection, guardrail enforcement, scoring urgency/risk, output verification
Jev available on Vercel AI Gateway (live as of Sep 16, 2026)
193.6x faster and 444.6x cheaper than LLMs on workflow evaluations (TypeSafe reported)
Returns typed answers (Choice, Score, Boolean) with confidence/probability scores in parallel, not sequential token generation
Use cases: agent decision routing, guardrail enforcement, output verification, priority/urgency scoring
Supports Zero Data Retention and No Training modes per request
Appears in logs, custom reporting, and counts toward budget tracking
Go to the source
Vercel Blogvercel.com
Publisher excerpt: is now available on AI Gateway.Jev from TypeSafe AI Jev is a probabilistic decision model for software: state goes in, typed Choice, Score, and Boolean answers come out. Regular language models generate text one token at a time, which the application then parses and validates. Jev evaluates all…