Vercel Reports Record-Breaking Adoption for New AI Model Jev

Jev has achieved the status of the fastest-adopted AI model in history, according to recent data from Vercel.

Data published on Thursday reveals that within just two weeks of its launch, the buzzy decision model was being utilized by 35% of paid teams. This figure represents nearly double the reach of the second most popular model, Sonnet 5.5, and marks the swiftest adoption a model has ever seen in its first two weeks. Acknowledged as a major accomplishment for its creators, Typesafe AI, Jev was published in limited release on September 15. Designed as a lightweight tool for choosing between a few pre-determined outputs, Jev runs cheaper and faster than alternatives like Sonnet, making it ideal for rapidly classifying large quantities of data.

This new approach has attracted significant buzz since Jev’s release, inspiring competing offerings from industry giants like OpenAI and Amazon. However, until now, there had been little hard data to substantiate the enthusiasm surrounding the model.

The insights come from Vercel’s AI gateway, a unified API service similar to OpenRouter. While this view is necessarily limited—particularly at risk of undercounting major labs such as OpenAI and Anthropic that offer their own APIs—it confirms that the buzz around Jev translated into actual usage. Notably, Vercel was an early adopter of the technology, using it to replace GPT-6 Luna for classifying harmful commands.

The report also highlights continued 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. As the market expands rapidly, spending on frontier labs has grown ten-fold. Despite this growth, frontier models account for a smaller share of overall spend, suggesting that frontier models and open-source alternatives may evolve into complementary rather than competitive forces.