Holo4 is H Company's new series of agentic models, in 27B dense and 35B-A3B mixture-of-experts sizes, with open weights on Hugging Face (CC BY-NC 4.0). The same model clicks and types on a screen, writes and runs its own code, and calls MCP or API tools, on desktop, web, Android, a code sandbox or business APIs. On OSWorld 2.0 the 27B scores 61.7% at a much lower cost per task than frontier models, and every benchmark trajectory is open to replay.