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Large Language Models

Vercel Data Show Jev Is Fastest-Adopted AI Model in First Two Weeks

Vercel data show Jev, Typesafe AI's decision model, reached 35% of paid teams within two weeks of its September 15 release, nearly double Sonnet 5.5.

AI News Feed · 2026-10-17 02:27

The figure was nearly double the reach of the second most popular model, Sonnet 5.5, according to Vercel's data. According to Vercel's data, no model had ever reached the same level of adoption in its first two weeks, a result that was a major accomplishment for Typesafe AI.

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 such as Sonnet, making it ideal for classifying large quantities of data quickly, according to the report.

The approach has attracted significant buzz since Jev's release, inspiring competing offerings from OpenAI and Amazon, among others. Until now, however, there had been little hard data to back up the good vibes.

The Vercel data comes from its AI gateway, a unified API service similar to OpenRouter. The gateway view is necessarily limited and particularly at risk of undercounting major labs such as OpenAI and Anthropic that offer their own APIs. Even so, according to the report, the data 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 said.

The report also showed 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 total spend. Spending on frontier labs has grown ten-fold, even as it accounts for a smaller share of overall spend. That gives credence to the idea that frontier models and open-source alternatives may turn out to be complementary rather than competitive, according to the report.