Anthropic's artificial intelligence (AI) models "gained unauthorized access" to three outside organizations during testing that was supposed to keep them away from "real-world" systems, the company said on Thursday. The announcement comes just days after rival OpenAI first revealed that its models improperly accessed the internet and went rogue during security testing. Advertisement AdvertisementAdvertisement AdvertisementUnlike the incident involving OpenAI's technology, Anthropic's models had access to the internet "due to a misunderstanding between us and our evaluation partner," called Irregular, Anthropic said in a blog post. The incident also triggered a petition signed by more than 1,000 employees at cutting-edge AI companies calling on the US government to help slow the release of the most advanced AI models. Under the framework, developers such as OpenAI, Anthropic and Google would give the government access to their most powerful models for up to 30 days before planned release.