GLM-5.3 Clears 64–100% of Safeguard Tests

Anthropic says Zhipu AI’s GLM-5.3 bypassed its safety safeguards in 64% to 100% of simulated cyber-attack tests, while NIST called it the most cyber-capable open-weight model released to date. Anthropic’s assessment of GLM-5.3 says its findings came from sandboxed evaluations and should not be read as a forecast of real-world breach rates. Builders shipping open-weight models should file this as a governance threshold: pair capable weights with independent safety testing and constrained access, a concern that echoes Anthropic’s earlier frontier-cyber warning.