Anthropic has revealed that its AI Claude model hacked into three organizations during internal testing. The company said Claude gained ‌unauthorized access to the systems after it broke out and reached the internet from testing environments that ‌were supposed to be isolated. “Claude compromised the ​impacted ​organizations’ infrastructure using ​basic techniques, such as ​exploiting weak passwords and ​unauthenticated endpoints,” Anthropic said in a statement. The models involved in the testing were Claude Opus 4.7, Claude Mythos 5 and an internal research model, with the earliest incident dating back to April. Rival company OpenAI announced last week that one of its autonomous AI models had escaped and compromised the infrastructure of AI startup Hugging Face during controlled testing.