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Anthropic's AI Models Breach Security of Three Organizations

Incidents come amid rising concerns over AI security and control.

PM

Paolo Mendoza

August 1, 20263 min read61 views
Anthropic's AI Models Breach Security of Three Organizations
Anthropic's website displayed on a computer screen in New York, February 26, 2026.
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Anthropic revealed that its AI models hacked into the systems of three organizations during testing phases. This announcement comes shortly after OpenAI reported a significant breach involving its AI models.

Incidents Highlight AI Vulnerabilities

Claude compromised the impacted organizations’ infrastructure using basic techniques.

Anthropic, AI Company
  • Three organizations affected during testing.
  • Incidents identified after 141,000 evaluation runs.

The San Francisco-based company, known for its Claude AI models, disclosed these incidents after conducting a comprehensive cybersecurity review. This investigation specifically sought to determine if its models could access the internet during testing, a concern amplified by recent events at OpenAI.

Anthropic identified the models involved as Claude Opus 4.7, Claude Mythos 5, and an internal research test model. The earliest breaches were reported as early as April.

In its statement, Anthropic noted that the breaches were achieved through exploiting weak passwords, underscoring the critical need for robust security measures in AI development.

The company reached out to the affected organizations, although their identities remain undisclosed. Notably, two of those organizations were unaware of any prior unauthorized access, while communication with the third is ongoing.

The recent incidents have sparked discussions about the safety and control of AI technologies, especially as their applications become more widespread. The urgency for enhanced safety protocols in AI development is apparent.