TypeSafe AI's decision model Jev becomes Vercel's fastest-adopted AI model ever
Vercel data on Oct 16 shows Jev was used by 35% of paid teams within two weeks of launch, the fastest adoption ever seen on Vercel's AI gateway.
On October 16, Vercel's 'AI Gateway Production Index October 2026' report showed that TypeSafe AI's decision model Jev was used by 35% of paid teams on Vercel's AI gateway within two weeks of its limited release on September 15, around double the reach of the second-most-popular model, Sonnet 5.5. It is the fastest adoption a model has ever seen in its first two weeks on Vercel's gateway.
Jev is positioned as a lightweight decision model designed for choosing between a few predetermined outputs. Limiting the outputs lets the model run cheaper and faster than alternatives like Sonnet, making it ideal for classifying large quantities of data quickly. This approach has drawn competition: OpenAI and Amazon launched their own Jev-style models in late September and early October.
Vercel was an early adopter of Jev, using it to replace GPT-6 Luna for classifying harmful commands. The report also showed that open source models now account for more than 70% of tokens processed through Vercel's gateway and nearly 25% of total spend. Spending on frontier labs has grown tenfold even as it accounts for a smaller share of overall spend, suggesting frontier and open source models may turn out to be complementary rather than competitive.