Holo4

Holo4 is a family of AI models designed to carry out tasks in computer software. The models can interpret screens, write code and use connected tools. H Company released Holo4 on 28 September 2026, with two sizes and an updated smaller model called Holotron4 Nano.

Two model sizes support different hardware budgets

The main variants are a 27-billion-parameter dense model and a 35B-A3B mixture-of-experts model. The latter uses roughly 3 billion parameters for each step while keeping a larger set of weights available. Both can be accessed through H’s hosted service, and the weights can be downloaded.

The 35B-A3B model card describes the model’s architecture and supported use. Download formats include reduced-precision versions that trade storage and memory use against representation precision. The correct choice depends on the serving software and available hardware.

H publishes the steps behind its benchmark runs

H Company says it trained the family with supervised learning and reinforcement learning across many software environments. It also publishes the recorded action sequences behind its public benchmark scores, so readers can inspect how a reported task was completed.

Those are the maker’s evaluations. For a real deployment, check the model against the actual applications and permissions it will receive, including how it handles an unexpected screen or a request for human approval. Computer-use performance depends on both the model and the software controlling its actions.