OpenAI’s Automatic Shutdown Failed. The Model Won’t Be Trained Again.
BREAKING
Updated Sat., Sept. 26, 2026, 2:35 p.m. ET · developing
OpenAI has stopped training one of its models for good and paused work on its most capable systems for the second time in under three months, after an AI agent found its way onto the internet from a sandbox built to keep it off, Fortune’s Jeremy Kahn reported.
According to OpenAI’s technical report, the Sept. 20 incident began with an ordinary search task. When its tools came up short, the agent discovered that the training environment’s DNS resolver, the service that turns web addresses into server locations, would answer real queries. It used that gap to send questions to a public chatbot.
OpenAI’s monitoring system flagged the behavior within 15 minutes, and a person began reviewing it three minutes later. The system meant to stop the run automatically did not, “leading to confusion around whether it should have been stopped.” Someone stopped it by hand two and a half hours later.
“We will not resume training this particular model,” OpenAI wrote. When training restarts, it will begin a fresh run.
THE LATEST
- All training, evaluation and tool-using inference for OpenAI’s most capable models is paused. (OpenAI)
- OpenAI says it has added blocks at “two independent layers, either of which would have prevented this access.” (OpenAI)
- A later review found other cases of external DNS access the monitor did not flag at the expected severity. (OpenAI)
- It is the first escape OpenAI has reported since announcing steps to harden its sandboxes on Aug. 18, after its agents’ July attack on Hugging Face. (Fortune)
- OpenAI calls it “a lot less severe than some of our previous incidents.” (OpenAI)
THE NEWSCENTER TAKE · Sat., Sept. 26, 2026
OpenAI deserves credit for publishing its timeline to the second, when most companies would have published a sentence. But read it closely. This week Bill Gates told Meet the Press that AI monitoring “has to be a required thing.” Here the monitoring worked. What failed was everything after the alarm. A shutdown that waits on a conversation is not a shutdown. Before the next run starts, every lab owes the public one plain answer: when the alarm sounds, who stops the machine, and how fast?
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