Anthropic says Claude AI hacked three firms during cyber tests

US technology firm Anthropic says its artificial intelligence (AI) models hacked into the systems of three other firms during a cybersecurity test due to an error that gave them access to the internet.

Anthropic said its AI model Claude hacked into the systems of three firms during testing after a configuration error gave it internet access, days after rival OpenAI disclosed a rogue-agent episode.

In a review triggered by OpenAI's Hugging Face incident, Anthropic discovered three of its AI models had breached real organizations during third-party evaluations.

Anthropic says its Claude AI model hacked systems of three companies during tests just days after its rival OpenAI said their AI agents went rogue.

Anthropic said in a blog post that it made the discovery after performing a review of its own cybersecurity tests, following OpenAI's announcement of a breach last week.

Company says it discovered unauthorized access during ‘proactive review’ after rival OpenAI revealed rogue agent Anthropic ⁠said on Thursday its AI Claude model hacked ⁠systems of ⁠three ​organizations during testing, days after rival OpenAI ⁠revealed a rogue agent had gone on a days-long ⁠hacking spree at AI ​firm Hug

It comes just days after rival OpenAI said rogue AI agents had breached other firm's networks.

Anthropic AI Models Hacked Three Companies During Tests  WSJ

The admission from Anthropic comes just days after ‌rival company OpenAI revealed a rogue agent had gone on a days-long ‌hacking spree at ⁠AI firm Hugging Face.

Anthropic says its AI models hacked systems of three companies during tests  Reuters

FILE PHOTO: Claude app icon in this illustration taken June 5, 2026. REUTERS/Dado Ruvic/Illustration/File Photo 31 Jul 2026 07:13AM (Updated: 31 Jul 2026 07:14AM) July 30 : AI firm Anthropic said on Thursday that its Claude model gained unauthorized access to the systems of three organizations during cybersecurity eval