Jev has become the fastest-adopted AI model ever on Vercel's AI gateway, according to Vercel data published on Thursday. Within two weeks of its launch, the model was being used by 35% of paid teams, with nearly double the reach of the second most popular model, Sonnet 5.5.
Published in limited release on September 15, Jev is designed as a lightweight tool for choosing between a few pre-determined 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, according to the report.
The data comes from Vercel's AI gateway, a unified API service similar to OpenRouter. Vercel notes the view is necessarily limited, particularly at risk of undercounting major labs like OpenAI and Anthropic that offer their own APIs, but it shows the buzz around Jev translated into actual usage. Vercel was an early adopter of Jev, using it to replace GPT-6 Luna for classifying harmful commands.
The report also shows continuing momentum for open-source models, which now account for more than 70% of the tokens processed through Vercel's gateway and nearly 25% of the total spend. Spending on frontier labs has grown ten-fold, even as it accounts for a smaller share of overall spend, giving credence to the idea that frontier models and open-source alternatives may turn out to be complementary rather than competitive.