Billionaire Elon Musk said on Monday his artificial intelligence startup xAI would take legal action against Apple , accusing the iPhone maker of breaching antitrust regulations in managing App Store rankings.

Elon Musk threatened to sue Apple for allegedly burying his Grok AI app under competing offerings in its App Store.

Musk has not yet provided evidence that Apple has suppressed his apps. As of this writing, ChatGPT is the top app on the Apple App Store charts; Grok is in the fifth spot, lagging behind Threads.