Holo4 opens 27B and 35B agent models

H Company released Holo4 in 27B dense and 35B-A3B mixture-of-experts sizes, with weights and trajectories available on Hugging Face. The model release says Holo4 works across GUI, code, MCP, and API interfaces, scoring 61.7% on OSWorld 2.0 for Holo4 27B versus 81.8% for Claude Opus 5.5, while exposing replayable trajectories; the 35B model reached 30.9%. For builders, this is an open-weight agent option whose evidence can be replayed rather than a frontier replacement—extend the archive’s agent-runtime pilot with task-level acceptance tests.