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Cua S1- A family of System One models

Cua open-sourced CUA-S1-FORMS, the first model in its CUA-S1 family of small, specialized "System One" models built for computer use, publishing the code at github.com/trycua/cua. CUA-S1-FORMS fills forms in a single pass by selecting from a fixed action set of FILL, CHECK, CLICK, or SKIP, with field values drawn from a supplied document and the application validating and ordering the plan as fields, checkboxes, then submit when authorized. Cua framed the release as a specialist alternative to step-by-step LLM agents for repetitive, bounded, high-volume computer workflows.

read1 min views1 publishedSep 18, 2026
Cua S1- A family of System One models
Image: source

Cua on X: "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: https://t.co/J1frbEbZTQ" 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

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

2/ A specialist in action. On the left, a small specialist decides how to fill the form in one pass. Cua Driver then carries out the actions in order. On the right, an LLM agent works through the form step by step using Cua Driver.

3/ CUA-S1-FORMS selects from known options: FILL, CHECK, CLICK, or SKIP. Field values come from the supplied document. The application validates and orders the plan: fields, checkboxes, then submit when authorized.

5/ CUA-S1-FORMS is the first specialist in the family.

If your company runs repetitive, bounded, high-volume computer workflows, we'd like to hear what CUA-S1 should learn next.
[email protected]

bro open-sourcing a tiny specialist that fills forms in one pass while the LLM still clicks around when the task is bounded, a small model with a fixed action set beats a chatty generalist.

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