Much attention was paid to OpenAI’s Sam Altman and xAI’s Elon Musk trading barbs on X this week after Musk threatened to sue Apple over supposedly biased App Store rankings privileging ChatGPT over Grok. But while the heated social media exchanges were among the most tense ever seen between the two former partners who cofounded OpenAI—more on that below—it seems likely that their jabs were motivated less by who’s in the lead on Apple’s “Must Have” app list