Show HN: CUA-S1 – A System One Model for Computer Use

CUA-S1 is a 706k-parameter model that scores predefined actions (CHECK, CLICK, SKIP) for form fields instead of generating text, achieving 99.7% overall accuracy and 100% on action-required steps, compared to 83.6% and 96% for hosted Jev. The model scores locally in 7–9 ms, far faster than Jev’s 260–280 ms network calls. It is released under MIT with open-source synthetic data, training code, and driver integration.