Sam Witteveen · 2026-10-06 · notable
Sam Witteveen — 'Holo4: A Model That Clicks, Codes and Calls Tools'
Sam Witteveen's 6 October 2026 video looks at Holo4, H Company's open-weight computer-use models that click on screens, write code and call MCP or API tools. Holo4-27B scores 85.2% on OSWorld at $0.08 per task.
Sam Witteveen walks through Holo4, an open model built to operate software for you.
What is it?
'Holo4: A Model That Clicks, Codes and Calls Tools' went up on Sam Witteveen's channel on 6 October 2026. The video covers Holo4 from H Company, a family of computer-use models released on 28 September 2026 in a 27B dense size and a 35B-A3B mixture-of-experts size.
How does it work?
According to H Company, one Holo4 model works through whatever interface a task needs: it clicks and types on a screen, writes and runs code, or calls MCP and API tools. Holo4-27B is built on Qwen3.8-27B with a 262K-token context. H Company trained it with supervised fine-tuning on 127B tokens, then online reinforcement learning with LoRA experts that were merged into one model.
Why does it matter?
Computer-use agents usually need separate models for screens, code and APIs. A single open model that scores 85.2% on OSWorld and 85.1% on AndroidWorld at about $0.08 per task makes local or cheap desktop automation more practical. Note the licenses differ: the 35B-A3B weights are Apache 2.0, while Holo4-27B is CC BY-NC 4.0.
Who is it for?
developers building computer-use and RPA agents