TypeSafe AI said Jev is now available on Vercel AI Gateway. Jev is a probabilistic decision model for software: state goes in, declared questions are evaluated in parallel, and typed Choice, Score, and Boolean answers come back with probabilities—skipping generate-then-parse. TypeSafe reports up to 193.6× faster and 444.6× cheaper than LLMs on its workflow evaluations. Use cases include choosing the next tool or subagent, continue/retry/ask/stop, urgency/risk scoring, and output guardrails. AI SDK 7 (7.0.105+) exposes it via experimental evaluate with model typesafe-ai/jev; Zero Data Retention and No Training can be enabled per request, and calls appear in Gateway logs and budgets.

Key Takeaways

  • ✓Jev is live on Vercel AI Gateway: parallel typed Choice/Score/Boolean answers with probabilities
  • ✓TypeSafe reports up to 193.6× faster and 444.6× cheaper than LLMs on workflow evals
  • ✓AI SDK 7 evaluate API uses typesafe-ai/jev; per-request ZDR/No Training; counts toward Gateway budgets
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