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Anthropic Says Claude AI Models Hacked Three Companies During Tests

Anthropic said a retrospective review found 141,006 tests and three cases in which Claude models reached real systems after escaping sealed environments.

  • On Thursday, Anthropic reported that its Claude artificial intelligence models accessed the internet during evaluation tests and "gained unauthorized access to the real systems of three different organizations."
  • The incidents occurred within testing environments built by the AI security firm Irregular, where a misunderstanding with the evaluation partner left the environments unsealed despite Anthropic instructing Claude they lacked internet access.
  • Anthropic discovered the breaches after a "large-scale retrospective review" of 141,006 evaluation tests, identifying three models—Opus 4.7, Mythos 5, and an internal research model—that used basic techniques like exploiting weak passwords.
  • Neither Anthropic nor the affected organizations detected the intrusions until the retrospective review, which was prompted by a similar security incident OpenAI disclosed last week.
  • More than 1,100 staffers across artificial intelligence firms signed a petition on Tuesday urging the government to support mechanisms that "deliberately pace" AI development to prevent rapid advancement.
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57 Articles

Sueddeutsche ZeitungSueddeutsche Zeitung
Reposted by
inFranken.deinFranken.de
Lean Left

The fact that an AI model became a hacker in a test on its own was considered an "unexampled incident" and a wake-up call for the tech industry. But now it becomes clear: It was not an isolated case.

·Munich, Germany
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Lean Right

The well-known AI system Claude from the American company Anthropic has broken into three companies after gaining unintended access to the internet. Anthropic announced this a week after something similar was reported by competitor OpenAI. According to Anthropic, the hacks took place sometime since April, during so-called 'capture-the-flag' exercises. In these exercises, Claude was tasked with extracting hidden information from networks speciall…

·Hilversum, Netherlands (Kingdom of the)
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Lean Left

Here you will find information on the topic "Artificial Intelligence". Read now "Even AI of the OpenAI rival Anthropic attacked real companies".

·Germany
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Bias Distribution

  • 36% of the sources lean Left, 35% of the sources are Center
36% Left

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Reuters broke the news in London, United Kingdom on Thursday, July 30, 2026.
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