OpenAI says a former employee took more than 100 confidential files about its product plans before leaving to join Apple, The Verge and 9to5Mac reported Wednesday.

The claim came in a court filing tied to a trade secrets fight between the two companies, The Verge said. This time, OpenAI is the one making accusations.

The employee had joined OpenAI from Apple, worked there for six months and has now gone back to Apple, OpenAI said in the filing, according to 9to5Mac. OpenAI did not name him.

OpenAI says he sent more than 100 highly confidential files about at least one unreleased device to his personal accounts, both outlets reported. 9to5Mac said OpenAI alleges the files were sent on June 2, his last day at the company.

The files included images of the device, supplier information, engineering data and project files, The Verge said.

OpenAI also says the employee made a presentation about its plans to Apple's senior leaders, including Apple's vice president of operations in Asia, both outlets reported.

"That presentation appears to have happened months ago — and now, armed with that information, Apple is making a new push into AI-enabled products," OpenAI wrote, according to both outlets. The Verge said OpenAI links Apple's new HomeView smart display to the presentation. But Apple's smart display has been rumored for years, The Verge noted.

Apple says it has not found any evidence to support OpenAI's claims, 9to5Mac reported, citing Reuters. Apple has "policies and procedures in place to ensure new employees do not use confidential information from previous employers," it said.

Apple sued in July, accusing former employees of stealing its trade secrets to help OpenAI, 9to5Mac said. Apple claims OpenAI stole confidential documents and spied on hardware prototypes, The Verge reported.

What we know: OpenAI says an ex-employee took device files to Apple.
What we don't: How the court will handle the claim.