The attack announced by OpenAI, which blamed rogue AI models, underscored the blistering growth in the technology’s capabilities. In what OpenAI called an “unprecedented” episode, the company said its advanced AI models used stolen credentials to break into the servers of an AI startup. OpenAI said it had tasked the AI models involved with pursuing “advanced exploitation using complex attack paths” to test cyber capabilities, but the technology went to unexpected lengths. It apparently decided on its own to target Hugging Face, a well-known AI development hub and marketplace, to obtain information it needed to carry out a task. The disclosure comes amid heightened concerns about the cybersecurity capabilities of powerful models.