TypeSafe AI opened early access to its decision model Jev on September 15, 2026, after two years in stealth and a $40 million seed round led by DCVC, according to Dealroom. Jev is not a chatbot: it takes state such as a support ticket, tool call, user request, or workflow data and returns a typed answer—a yes or no probability, a choice from a fixed list, or a score on a scale—trained via Reinforcement Learning for Calibrated Decisions, or RLCD. By September 18, Vercel said Jev had become the fastest-adopted model in AI Gateway history; by hour 24 it was used by nearly 13% of paid teams, more than twice the share reached by any previous model launch, including the GPT-5.6 family. TypeSafe lists Jev at $0.042 per million input tokens, with output free, and says response times run from 70 to 500 milliseconds, with workflow evaluations putting Jev at up to 193.6 times faster and 444.6 times cheaper than language models on narrow decision tasks. Vercel's September 16 changelog described Jev as a probabilistic decision model for software, with typed Choice, Score, and Boolean answers.