Apple has started a big lawsuit against OpenAI. This happened last Friday. Apple says OpenAI used its trade secrets unfairly.
The lawsuit claims that many former Apple employees now work at OpenAI, more than 400 people. Apple believes there was bad behaviour, even involving a high-ranking officer at OpenAI.
This lawsuit is happening at a difficult time for OpenAI. The company might be planning to offer its shares to the public (an IPO). This legal problem could make those plans harder.