Anthropic’s artificial intelligence (AI) models “gained unauthorised access” to three organisations during testing that was supposed to keep them away from “real-world” systems, the company said this morning.

Anthropic said the earliest of these incidents occurred in April, and it has notified all three companies that were affected by the hack.

A little over a week after OpenAI said that its rogue AI agent accidentally hacked Hugging Face, Anthropic is disclosing three “incidents” where a Claude model, during…