LLM Reference

CUA-S1 Models by Cua

CuaMITOpen sourceOpen SourceAgents
1 model2026

Last refreshed 2026-09-18. Next refresh: weekly.

Details

ResearcherCua
LicenseMITOSI-approved
Commercial useCommercial use: permitted
Models1
Released2026

About

CUA-S1 is Cua's family of System One Models — small, specialized, non-autoregressive computer-use specialists (not chat LLMs). Each checkpoint has a narrow task contract; membership does not imply general computer-use capability. First open-sourced specialist: CUA-S1-FORMS (form-oriented option scorer behind Cua Driver). Compare it for Open Source / Agents / computer-use.

Decision facts

Best fit
agentscomputer usecoding
Capability starting point
CUA-S1-FORMS
Lowest tracked input
Not tracked
Closest related family
Agents-A1

Current Variants

Use-when guidance is based on each model's tracked capabilities, context window, release date, and replacement status.

1 in view

Use when the workload needs computer use, 706K parameters, and open source.

2026-09computer use706K parametersopen source

Release Timeline

1 release group
2026-09
1 current
CUA-S1-FORMS
computer use706K parametersopen source
Current

Specifications(1 models)

CUA-S1 model specifications comparison
ModelReleasedParameters
CUA-S1-FORMS2026-09706K