CUA-S1 Models by Cua
1 model2026
Last refreshed 2026-09-18. Next refresh: weekly.
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
CUA-S1-FORMSCurrent
Use when the workload needs computer use, 706K parameters, and open source.
2026-09computer use706K parametersopen source
| Model | Use when | Released | Signals | Status |
|---|---|---|---|---|
| CUA-S1-FORMS | Use when the workload needs computer use, 706K parameters, and open source. | 2026-09 | computer use706K parametersopen source | Current |
Release Timeline
1 release group2026-09
1 current
CUA-S1-FORMS
Currentcomputer use706K parametersopen source
Specifications(1 models)
| Model | Released | Parameters |
|---|---|---|
| CUA-S1-FORMS | 2026-09 | 706K |