
The Frontier
Cua's 2.8 MB open model fills forms without an LLM call
Most of what an agent does is not reasoning — it is deciding that this value goes in that box. Cua just published the weights for that decision, and they are smaller than the PDF being filled in. Cua open-sourced CUA-S1-FORMS on Friday: a 706,048-parameter model that scores form-filling decisions in one forward pass, generates no text, and ships as a 2.8 MB checkpoint. It is the first release in what the company calls the CUA-S1 family of "System One" models — fast, bounded decisions — and it s










