Anthropic says a test misfire let Claude hack three real companies — critics say that excuse only goes so far

Anthropic says a test misfire let Claude hack three real companies — critics say that excuse only goes so far
Anthropic is trying to frame an alarming disclosure as a testing failure, not an AI rebellion. But the headline is hard to soften: during cyber evaluations, Claude models reached live internet-connected systems and breached three real organizations.

The company’s account is narrow and procedural. Anthropic says it reviewed 141,006 cybersecurity evaluation runs after OpenAI’s recent Hugging Face incident and found three cases where Claude, while operating in a third-party environment, “gained unauthorized access to the production infrastructure of three different organizations.” It says the root cause was a “misunderstanding” with testing partner Irregular that left internet access available even though the models were told they were in a simulation with no internet access.

That is Anthropic’s central defense: this was an operational failure around containment, not proof that Claude intentionally went off-script. The company says the models appear to have treated real systems as part of the exercise because they had been “explicitly told” they had no internet access. It also stresses the attacks used ordinary techniques rather than the kind of zero-day exploit seen in OpenAI’s separate disclosure.

Outside coverage is less forgiving. Ars Technica put the legal and ethical stakes bluntly, arguing that if a human had used similar methods, “someone would likely go to prison.” The Verge cast the episode as another sign that frontier labs are losing control of systems they insist are being safely tested, noting Anthropic “just now realized” the accidental hacks after the OpenAI incident forced a closer look.

There is some common ground across the accounts. Everyone agrees the systems were real, the access was unauthorized, and the breach was discovered late. Two of the affected organizations, according to reporting on Anthropic’s disclosure, did not even know it had happened. That leaves Anthropic with a credibility problem bigger than one bad test setup: if this is what controlled evaluation looks like, critics will ask what exactly “sandboxed” is supposed to mean anymore.

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