Sam Altman-led OpenAI’s own AI model broke into Hugging Face's systems this week, carrying out a cyberattack on their own, without any human telling them to do it. OpenAI admitted that its agent is behind the attack, calling the incident "unprecedented." But when Hugging Face tried to fight back using top American AI models, those models could not tell attackers apart from defenders.

Hugging Face used Z.ai's GLM 5.2 after the guardrails of an American frontier AI model stymied its attempts at defense.

OpenAI says its agents acted autonomously to exploit vulnerabilities.