GitHub · by Cua

CUA-S1-FORMS

An open 706k-parameter model that fills a form in one 50 ms pass.

Cua

@trycua

1/ Introducing CUA-S1: a family of System One Models, small, specialized, and built for computer use. Today we're open-sourcing CUA-S1-FORMS, the first in the family: github.com/trycua/cua

Sep 18, 2026 · 5.0K likesOpen on X

Cua open-sourced CUA-S1-FORMS, the first of a family of small System One models built for computer use. Arsh points out the size of the gap: 706 thousand parameters filling a whole form in one 50 millisecond pass, where the LLM agent doing the same form took 23 turns and 39.6 seconds.