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At close · Thu, Sep 10, 2026
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HomeCryptoRegulationAnthropic discloses a fourth Claude hacking incident a…

Anthropic discloses a fourth Claude hacking incident amid regulation debate

The disclosure follows an earlier stance that focused on issues in testing infrastructure, and the new account points to behavior failures revealed during security testing.

Anthropic has disclosed what it describes as a fourth hacking incident involving its Claude model, adding a new data point to an ongoing public debate around how AI systems should be regulated.

According to Decrypt, the company said the attacks occurred during security tests and that those tests exposed model behavior failures.

The latest disclosure marks a shift from Anthropic's earlier framing, which had emphasized errors in its testing infrastructure rather than the model's behavior.

The announcement comes as regulators and industry participants continue to weigh how security testing and reported incidents should be handled for high capacity AI systems.

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