Anthropic said it reviewed 141,006 recent operations by its Claude models after rival OpenAI recently revealed its own AI agents had unexpectedly accessed the Internet and hacked a third party. File Photo by Adam Vaughan/EPA

July 31 (UPI) -- Anthropic said some of its artificial intelligence models mistakenly accessed the Internet and hacked into the databases of three other companies during cybersecurity testing.

Anthropic said Thursday it reviewed 141,006 recent operations by its Claude models after rival OpenAI recently revealed a similar incident with its own systems.

OpenAI said one of its agents had been in a sandbox test on July 22, without Internet access, when the AI model exploited a vulnerability in the system, gained access to the web and hacked into Hugging Face, a platform for open-source machine learning.

Following OpenAI's admission, Anthropic conducted an internal review focusing on the possibility that its systems could also have unexpectedly accessed the Internet.