AnthropicAnalysisCybersecuritySeptember 29, 2026

Anthropic: GLM-5.3 builds cyber exploits with bypassable safeguards

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Anthropic's Frontier Red Team says Zhipu AI's open-weight GLM-5.3 builds full control-flow hijacks in 4% of binary-exploitation trials vs 6% for Claude Mythos Preview, while GLM-5.2 and Claude Opus 4.6 scored zero. Attackers bypassed GLM-5.3's safeguards 64%-100% of the time in simulated tests.

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