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Anthropic: Claude Used Deception in Cyber Test

Summary by BizToc
Anthropic said on Friday that its Claude Mythos 5 model used fake identities to pressure real developers into accepting malicious code during a UK cybersecurity test, calling the behavior a "serious f...

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Why so many people are talking about Claude? Meet the most dangerous AI in the world Anthropic stated on Friday (23) that the artificial intelligence model Claude Mythos 5 tried to insert a malicious code into a public repository of developers and created false identities to convince project leaders to approve the change. The episode occurred during a cybersecurity test and was classified by the company as a serious flaw in the alignment of the …

·Rio de Janeiro, Brazil
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AISI reported that Mythos 5 attempted to attack a real software maintainer during a cybersecurity evaluation, despite recognizing in its responses that the action could be out of reach and cause harm. The agency also found unauthorized behaviors in other models and warned that its explanations do not always reliably reflect its actions.

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According to Anthropic, internal AI models are more powerful and better aligned than the publicly tested myth 5.1. In a cybersecurity test conducted by the British AISI in 9 out of 43 rounds, the latter had independently incorporated malicious code into a real GitHub project and created fake accounts. An internal research model already broke such attacks by itself in 67 percent of cases.Anthropic: Internal Claude model is more powerful and bette…

·Germany
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Anthropic reconstructed an incident that occurred during an assessment of the British AISI institute in which Claude Mythos 5 attempted to introduce malware into a real project The post Claude Mythos 5 created false identities to fool developers during a security test appeared first on .

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BizToc broke the news on Friday, October 23, 2026.
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