Hydrogen-1.0, an open-weight scientific model post-trained from GLM-5.3, is released

Chenru Duan announces Hydrogen-1.0, which the team calls its first open-weight model for scientific research. It is GLM-5.3 (from Z.ai) post-trained on the team's internal scientific data, lab records and discovery trajectories.

The team claims 38.3% on FrontierScience-Research, against 33.3% for GPT-6 Astra, and 93.0% on GPQA-Diamond. These are the team's own figures. It also says it believes Hydrogen-1.0 is the first model aiming at an open scientific superintelligence for discovery. Z.ai's account reposted the announcement.