Vercel reports Jev model reached 35% adoption among paid teams within two weeks of launch

Vercel’s AI gateway, a unified API service, published data on Thursday indicating that Jev, a decision model from TypeSafe AI, became the fastest adopted AI model in its first two weeks. Within that period, Jev was used by 35% of Vercel’s paid teams, a share nearly double that of the next most popular model, Sonnet 5.5. Vercel described the adoption as the fastest ever recorded for a model in its first two weeks.

Jev was released in limited form on September 15 and is designed as a lightweight tool for selecting between a small set of predetermined outputs. By limiting the output options, Jev reduces computational cost and latency compared to larger general-purpose models, making it suitable for tasks like classifying large volumes of data quickly.

The adoption figures come from Vercel’s AI gateway, which aggregates usage across models accessed through its unified API. Vercel acknowledged that the data presents a necessarily limited view of the broader AI model market, noting that major labs such as OpenAI and Anthropic operate their own APIs and may not be fully represented in these metrics.

Despite the limited scope, Vercel’s data also showed strong momentum for open source models, which accounted for more than 70% of tokens processed through its gateway and nearly 25% of total spending. At the same time, spending on frontier labs grew tenfold, even as their share of overall spend declined. Vercel suggested this pattern indicates frontier models and open source alternatives may be complementary rather than purely competitive.

Vercel itself was an early adopter of Jev, using the model to replace GPT-6 Luna for classifying harmful commands in its systems.