Elon Musk threatened legal action against Apple, accusing it of making it “impossible” for apps to compete with OpenAI’s ChatGPT in the App Store, the BBC reported. Musk also called OpenAI CEO Sam Altman a “liar” after Altman claimed Musk uses his platform to benefit himself and his companies. The remarks escalate a years-long feud between the billionaires, who co-founded OpenAI before Musk’s departure. Apple partnered with OpenAI in June 2024 but has denied favoritism, noting other AI apps like DeepSeek and Perplexity have topped charts. Musk later criticized Apple for not featuring X or his AI app Grok in the App Store’s “Must Have” section. The dispute follows lawsuits, public attacks, and Musk’s failed $100 billion bid for OpenAI earlier this year.