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

By Thomson Reuters Jul 30, 2026 | 6:13 PM

July 30 (Reuters) – 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 Hugging Face.

Claude gained unauthorized access to the systems during ​cybersecurity evaluations after a misconfiguration allowed the ⁠models to ⁠reach the internet from ​testing environments that were ​supposed to be isolated, Anthropic ‌said.

The company said it identified the incidents after reviewing 141,006 cybersecurity ⁠evaluation runs, a process it launched following OpenAI’s disclosures.

“Claude compromised ⁠the ‌impacted organizations’ infrastructure ⁠using basic techniques, ​such ‌as exploiting weak ​passwords and ⁠unauthenticated endpoints,” it said.

(Reporting by Mrinmay Dey in Mexico City. Editing by Alan Barona and Shilpi ​Majumdar)