TypeSafe AI · System One Model

Jev

A model that stops generating text. You send unstructured input plus named questions and it answers all of them in one parallel pass, returning a choice from your own option list, a position on a scale you define, or a probability that a statement is true, each with a confidence figure. Choice caps at 255 options, input is capped around 32,000 tokens, pricing is $0.042 per million input tokens with output free. The advertised 0% hallucination rate means zero schema violations rather than zero wrong answers, and TypeSafe's own documentation says calibration "does not guarantee that an individual answer is correct". Their benchmark scores Jev against the average of GPT-6 Astra and Fable 5.1 outputs, which measures agreement rather than correctness, and the CEO conceded on Hacker News that the latency comparison is problematic because output tokens are not comparable. Launched 15 September with $40M led by DCVC.