Z.ai previews GLM-5.3 cyber model with staged release and OpenVuln initiative

Z.ai says GLM-5.3 is its most capable model for cybersecurity tasks, with CyberGym at 84.5% versus 77.2% for GLM-5.2 and ExploitBench at 54.4% versus 24.4%.

Access will begin with selected security partners in controlled settings, followed by broader access and API availability, with full open weights to be published after safety evaluations are complete.

The company also launched the OpenVuln initiative to help open-source maintainers audit projects and coordinate disclosure.