OpenAI said it found a "sophisticated recording device" hidden in one of its offices and used its own AI to identify who planted the device.

"We used our models to understand the device and where it had come from, identifying that a specific employee had planted it a few days earlier," OpenAI wrote in an X post on Tuesday. "We referred the matter to the FBI, and we're grateful to the agents and prosecutors who moved quickly to make an arrest. The FBI's investigation is ongoing and we will continue to support their work."

The company said that it found no evidence that the employee improperly accessed or manipulated model weights, source code, or customer data. The employee was fired, OpenAI said.

It's unclear exactly how OpenAI's models were used to identify the employee. The company said that the case was an example of how AI can help address "sophisticated security threats."

A spokesperson for OpenAI did not immediately respond to a request for comment.

The announcement comes on the heels of a cluster of firings at OpenAI unrelated to the recording device. In the prior case, the company let go of three safety and alignment employees who it alleged had "violated clear policies on handling sensitive information."