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Anthropic tests open-weight GLM-5.3 on exploits • On ExploitBench, GLM-5.3 built end-to-end exploits in 50 of 410 attempts, versus 56 of 410 for Claude Mythos Preview. • Anthropic says GLM-5.3 shipped without meaningful safeguards: malicious-request engagement rose from 0% to 64% with deceptive framing and 100% once abliterated. Source: https://www.anthropic.com/research/glm-5-3-and-the-spread-of-advanced-cyber-capabilities

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