Vercel says TypeSafe’s Jev is the fastest-adopted AI model on its gateway

The fastest-adopted AI model on Vercel’s AI Gateway does not write essays, poems or code. It answers questions with a yes, a no, a pick from a list, or a score. That model is Jev, built by TypeSafe AI. According to Vercel’s gateway data, it reached about 13% of the platform’s paid teams within 24 hours of launch. That figure outpaced every major chatbot-style model the gateway tracks. What Vercel’s numbers show The data comes from Vercel’s AI Gateway, a unified API service. Developers plug into one interface and switch between providers without rewriting their apps. Jev launched on September 15, 2026. Within its first day, its adoption among paid gateway teams was double that of the GPT-5.6 family at the same point. It was also more than six times the uptake of Fable 5.1 over the same window. Every other model stayed under 7% at the 24-hour mark. Vercel later formalized the result. Its AI Gateway Index, published on October 15, 2026, confirmed Jev as the fastest-adopted model on the gateway. The index also named it the most requested offering for September. A model that only decides Jev is described as a probabilistic decision model. Instead of generating free-form text, it returns...