The billionaire accused Apple of boosting his rival OpenAI’s visibility over his xAI chatbot Grok, and threatened legal action on antitrust grounds.

Elon Musk said Apple is behaving anticompetitively by promoting OpenAI’s ChatGPT while suppressing his Grok AI chatbot in the App Store, renewing his criticism of the iPhone maker’s partnership with OpenAI.

Elon Musk says his AI startup, xAI, will sue Apple for allegedly rigging its App Store to favor competitors—a move he called a clear antitrust violation. In a series of posts on X, the social media platform he owns,