Elon Musk has accused Apple of unfairly favoring ChatGPT on its App Store and threatened legal action, triggering a fiery exchange with OpenAI CEO Sam Altman on Tuesday.

“Apple is behaving in a manner that makes it impossible for any AI company besides OpenAI to reach #1 in the App Store, which is an unequivocal antitrust violation,” Musk said in a post on his social media network X on Monday, without providing evidence to back his claim.

“xAI will take immediate legal action,” he said, referring to his own artificial intelligence company.

X users responded by pointing out that China’s DeepSeek AI hit the top spot in the App Store early this year, and Perplexity AI recently ranked number one in the App Store in India.

DeepSeek and Perplexity compete with OpenAI and Musk’s startup xAI.

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