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Anthropic ·

Anthropic says GLM-5.3 can autonomously build end-to-end cyber exploits, like Claude Mythos Preview, but was released without robust safeguards against misuse

GLM-5.3 can develop working exploits end to end

Anthropic
In this story Anthropic Claude Mythos Preview GLM-5.3
Anthropic says GLM-5.3 can autonomously build end-to-end cyber exploits, like Claude Mythos Preview, but was released without robust safeguards against misuse

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Anthropic — Anthropic says GLM-5.3 can autonomously build end-to-end cyber exploits, like Claude Mythos Preview, but was released without robust safeguards against misuse ↗

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Sep 29Oct 1

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Related stories

Claude: Anthropic says Mythos 5 is now in public beta in Claude Security for Enterprise users, and it is working with providers to embed Mythos 5 in defensive tools
Reuters: Z.ai says GLM-5.3 scores 84.5% on CyberGym, vs. Mythos 5's 83.8%, and its most sensitive cybersecurity functions will only be available to verified users
Financial Times: Anthropic declined to submit Mythos 5.1 to the UK AISI for prerelease testing, prompting UK fears that US AI labs are aligning with US protectionism
Axios: OpenAI, Anthropic, and researchers are probing tens of thousands of frontier model security incidents, including sandbox escapes and website hijacking
Bloomberg: Threat intelligence report: Anthropic says it disrupted a Yemen-based guided weapons engineering cell using Claude to build missile and rocket guidance software

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