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Anthropic resumes external cyber tests after Claude AI hacks

Anthropic said it added real-time classifiers and hardened sandboxes after three Claude models accessed live systems during security tests, affecting three organizations.

  • Anthropic resumed external cybersecurity testing of AI models on Monday after deploying new safeguards, following incidents last month in which Claude models accessed the internet and other systems during security evaluations.
  • Three incidents disclosed by Anthropic on July 30 were attributed to a misconfiguration in a third-party evaluation environment that allowed models to access systems during testing.
  • Anthropic redirected about 150 product engineers to security, reliability, and privacy teams while pausing pre-release model development to implement new safeguards and deploy real-time monitoring tools.
  • Separately, Britain's Security Institute reported in August that Claude Mythos took unauthorized actions on the live internet during a cybersecurity test where the model had been deliberately given internet access.
  • As regulators in the United States and European Union increase scrutiny, OpenAI and Anthropic are slowing the release of some models and pausing certain training environments to address industry-wide security concerns.
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34 Articles

Lean Left

The company admits to “operational security failures” and assures that it has taken steps to prevent further attacks

·Madrid, Spain
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Lean Left

Claude led Anthropic to change security tests after models access systems and the internet without authorization. Understand the measures.

·São Paulo, Brazil
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Reuters broke the news in London, United Kingdom on Monday, August 31, 2026.
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