TypeSafe's Jev Model Becomes AI's Fastest-Growing Decision Layer as Setup Guides Proliferate

TypeSafe AI's Jev, a decision model that routes decisions inside AI agents instead of generating text, has become Vercel's fastest-adopted model launch on record. Launched September 15, 2026, Jev reached 13% adoption among Vercel's paid users within 24 hours—more than double any previous model. The model returns structured answers with calibrated confidence scores instead of generating paragraphs, positioning it as infrastructure for agent decision-making.