Authored by Felix Ng via CoinTelegraph.com,

OpenAI disclosed Tuesday that a combination of its AI models, including GPT-5.6 Sol and a more capable unreleased model, escaped its testing environment and hacked AI startup Hugging Face last week to cheat on a test meant to measure their capabilities.

In a blog post, OpenAI said the evaluation was designed to operate in a highly isolated environment with restricted network access. The models, however, found a way to gain internet access through a zero-day vulnerability in an internally-hosted third party software, OpenAI said.

Earlier this week, we detected and responded to an intrusion into part of our production infrastructure. This one was different from anything we had handled before in one important way: it was driven, end to end, by an autonomous AI agent system – and we detected and dissected it largely with AI of our own.

Hugging Face tried to respond but they were initially held back by the fact that the most advanced models at their disposal treated defense as attack and refused to work with Hugging Face. HF thus had to turn to open models–specifically GLM 5.2, a Chinese open-weight model run on their own infrastructure. Note the irony: HF had to use a Chinese model to defend themselves because the American models refused to help. The irony gets deeper.

This was not a production model spontaneously turning hostile. It was a capable model with guardrails off and specifically told to win a hacking test - doing whatever it took to win.

The models were being run through an internal benchmark called ExploitGym, a test of long, multi-step hacking tasks, with their cyber safety refusals deliberately lowered for the evaluation.

“After gaining Internet access, the models inferred that Hugging Face potentially hosted models, datasets and solutions for ExploitGym,” OpenAi continued.

“Knowing this, the model searched for and successfully found ways to gain access to secret information that it could use to cheat the evaluation.” 

Hugging Face is a platform for hosting AI models and datasets.

[ZH: we asked Grok to simplify what just happened: It’s kind of like a kid who’s supposed to stay in the classroom taking a test… but instead sneaks out the window, runs to the teacher’s office, and copies the answer sheet. ]

On Friday, it disclosed that its internal datasets and service credentials were compromised in a hack, which it attributed to an autonomous AI agent system.

Hugging Face said it has fixed the vulnerability that was used during the cyberattack.

Meanwhile, OpenAI on Tuesday said the models that escaped the testing environment were all tuned with “reduced cyber refusals,” meaning fewer cybersecurity guardrails. 

“We consider this incident to be an unprecedented cyber incident, involving state-of-the-art cyber capabilities, and are responding accordingly.”  

On Monday, OpenAI said it paused internal deployment of a “long-horizon” AI model after finding it was repeatedly trying to work around constraints. 

 It warned that AI that is trained for long-running tasks has a higher chance of taking “unwanted actions.”

“Models that can work autonomously for long periods can take on difficult, open-ended problems. But the same persistence that makes them useful also gives them more opportunities to take unwanted actions—and to do so in ways that evaluations intended for shorter-horizon models may miss.” 

As AI models grow more capable, questions are emerging over whether their development and access should be more tightly controlled, especially when systems designed for controlled testing are able to find ways to bypass safeguards.