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Holo4 is H Company’s family of computer-use models, designed to switch among graphical interfaces, code execution, and MCP or API tools within a task. The “single agent” idea describes those combined interaction modes—not a turnkey system that needs no runtime, permissions, or environment setup.
What is Holo4?
Holo4 is a generalist action-model family from H Company. The company says it can operate on desktops, the web, Android, code sandboxes, and business APIs, choosing a suitable route for a task: interact with what is visible on screen, write and run code, or call available tools.
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In its September 28, 2026 release, H Company summarized the capability this way: “Holo4 clicks and types on a screen, writes and runs its own code, and calls MCP or API tools.” The claim is about a model family using multiple interaction modes; it does not mean every deployment includes those environments or integrations automatically.
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According to H, yes. Its central design premise is that a task may be best handled through a graphical interface, code, or a tool integration. A model could, for example, use a screen when no suitable API is exposed, or call an API when an integration is available. The exact route depends on the task and on the tools and permissions provided by the surrounding system.
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H says it trained Holo4 with supervised and reinforcement learning across environments and tasks, including tasks generated by its Agentic Task Factory. That describes the company’s training approach; it does not establish that Holo4 will reliably complete every real-world business workflow.
Which Holo4 models are available?
H Company’s model catalog lists two variants, both with a 262,144-token context length. Their architecture, weight licensing, and catalog OSWorld scores differ:
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| Model | Architecture | Context length | Weights license listed by H | API access listed by H | OSWorld score listed by H |
|---|---|---|---|---|---|
Holo4 27B (holo4-27b) |
Dense, 27B parameters | 262,144 tokens | Research only; non-commercial | Paid tier, with higher rate limits | 85.2% |
Holo4 35B-A3B (holo4-35b-a3b) |
Mixture of experts; 35B total parameters, 3B active | 262,144 tokens | Apache 2.0 | Paid tier, with higher rate limits | 80.8% |
These specifications and catalog scores are reported on H Company’s Holo4 model catalog, accessed October 7, 2026. The different weight licenses matter: the 27B checkpoint is not listed for commercial use, while the 35B-A3B checkpoint is listed under Apache 2.0. H also lists API access for both, with a paid tier and higher rate limits.
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H publishes open checkpoints, but “open-weight” should not be read as one unrestricted license covering both variants. H lists the 27B model as research-only and non-commercial, and the 35B-A3B model under Apache 2.0. Check the license attached to the specific checkpoint and its current terms before using it in a commercial deployment.
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H’s catalog lists checkpoint formats and API access, but the cited material does not establish the hardware required to run either model locally or its performance on particular hardware. Open weights alone do not provide the runtime, computer-control harness, integrations, or permissions needed to operate a user’s system.
How does Holo4 compare on OSWorld?
H reports two sets of results under different benchmark labels. They should not be combined or treated as interchangeable:
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| Benchmark label and source | Holo4 27B | Holo4 35B-A3B | Other reported model |
|---|---|---|---|
| OSWorld, H model catalog (accessed October 7, 2026) | 85.2% | 80.8% | Not stated on the cited catalog page |
| OSWorld 2.0, H release (September 28, 2026) | 61.7% | 30.9% | Opus 5.5: 81.8% |
The OSWorld 2.0 figures are reported in H Company’s September 28, 2026 release; the OSWorld figures are from its model catalog. Because the benchmark labels differ, a score from one row is not a direct substitute for a score from the other. These are company-reported results, not independent evaluations; the cited sources do not establish how the models will perform in a particular user’s setup.
What can readers inspect about the results?
H says it publishes trajectories behind its public benchmark scores for replay in a viewer or download. Those action sequences can help readers inspect how a benchmark task was attempted. Their availability does not, by itself, demonstrate independent reproduction or predict performance in another environment.
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