Cua open-sourced CUA-S1-FORMS, a 706,048-parameter computer-use specialist with a 2.8 MB checkpoint

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trycua announced CUA-S1 as a family of small System One models for computer use, and the first member, CUA-S1-FORMS, scores UI element decisions directly from accessibility trees and document structure at sub-second latency. The MIT source in libs/cua-s1 covers synthetic data generation, training, evaluation and Cua Driver integration, with weights hosted separately on Hugging Face. The Show HN took 80 points on 2026-09-19; a sub-million-parameter model doing a real agent subtask is the notable claim, and it is single-vendor so far.