Elon Musk has threatened Apple with legal action for what he perceives as overt favoritism towards OpenAI's ChatGPT app in its App Store rankings. In a series of posts on X, he claimed that Grok, the chatbot created by his own company xAI, was being unfairly penalized by the iPhone maker.

The tech mogul is threatening immediate legal action, accusing the iPhone maker of an "unequivocal antitrust violation" designed to favor his AI rival.

As of early Tuesday, the top app in Apple's App Store was TikTok, followed by Tinder, Duolingo, YouTube and Bumble.