Anthropic Raises Alarm Over Elite Hacking Capabilities in Chinese Model GLM-5.3

Anthropic has issued a warning about Z.ai's GLM-5.3, a Chinese AI model that the company says demonstrates elite-level offensive cybersecurity capabilities, potentially surpassing safety thresholds Anthropic uses internally to assess risk. The alarm is notable because it represents one of the few instances of a leading Western AI lab publicly flagging the danger level of a specific competitor's model by name. Anthropic's concern centers on GLM-5.3's ability to assist with sophisticated hacking tasks, raising questions about how the international AI community should handle capability disclosures for models developed outside Western regulatory frameworks. For security-focused developers, this is a signal that the frontier of cyber-capable AI is expanding rapidly and is not confined to labs with established safety programs. The disclosure also adds urgency to ongoing debates about international AI safety coordination.