Musk tapped Yaccarino to replace him as CEO in 2023, shortly after purchasing the platform, then called Twitter, for $44 billion in October 2022. He said Yaccarino would focus primarily on Twitter's business while he focused on product design and new technology.

Grok 4 is xAI’s most advanced model yet, but early praise is clashing with old scandals and fresh tests of its limits.

Grok, the chatbot built by Musk’s start-up xAI, is integrated into X, the social media platform formerly known as Twitter.