Elon Musk has accused Apple of favouring ChatGPT on its App Store and threatened legal action, sparking a clash with OpenAI CEO Sam Altman. Musk called Apple's practices an antitrust violation and vowed to take immediate action through his AI company, xAI.

Critics on X noted rivals like DeepSeek AI and Perplexity AI have topped the App Store this year. Altman called Musk's claim 'remarkable' and accused him of manipulating X. Musk called him a 'liar', prompting demands for proof he never altered X's algorithm.

OpenAI and xAI launched new versions of ChatGPT and Grok, ranked first and fifth among free iPhone apps on Tuesday. Apple, which partnered with OpenAI in 2024 to integrate ChatGPT, did not comment on the matter. Rankings take into account engagement, reviews, and downloads.

The dispute reignites a feud between Musk and OpenAI, which he co-founded but left before the success of ChatGPT. In April, OpenAI accused Musk of attempting to harm the company and establish a rival. Musk launched xAI in 2023 to compete with major players in the AI space.

Chinese startup DeepSeek has disrupted the AI market with cost-efficient models. Since ChatGPT's 2022 debut, major tech firms have invested billions in AI. OpenAI claims Musk's actions are driven by ambition rather than a mission for humanity's benefit.