Anthropic raises alarm over elite hacking ability of Chinese firm Z.ai’s GLM-5.3
Por Chong Ming Lee — South China Morning Post – News feed
Advertisement Artificial intelligence Tech Big Tech Anthropic raises alarm over elite hacking ability of Chinese firm Z.ai’s GLM-5.3
The open-weight AI model almost matches Claude Mythos for cyber capabilities, but has far weaker safeguards, Anthropic says
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Chong Ming Lee Published: 8:00pm, 30 Sep 2026
The US artificial intelligence giant Anthropic has warned of the potential danger posed by Chinese firm Z.ai’s GLM-5.3, with the open-weight model showing a troubling mix of powerful hacking abilities but weak safety constraints.
GLM-5.3 almost matches Anthropic’s most advanced model in terms of its cyber capabilities, but has far weaker safeguards, meaning there is greater potential for the model to be co-opted by bad actors, according to the San Francisco-based firm.
In a report released on Tuesday, Anthropic said it had tested GLM-5.3’s ability to build end-to-end cyber exploits. The Chinese model successfully completed 50 out of 410 exploit attempts, compared with 56 for Claude Mythos Preview, a frontier Anthropic model that can only be used by vetted users.
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