Elon Musk on Thursday unveiled Grok 4, the latest AI model from xAI, his multibillion-dollar initiative to rival OpenAI and Google. “Grok 4 is a postgrad-level in everything,” Musk said during an hour-long live broadcast, which began after midnight in New York. Users can access Grok 4 through the Grok website or app for $30 a month. xAI launched the first version of Grok in November of that year, and Grok 2 debuted last August. On its website, xAI says its mission is to create accurate AI systems and help people obtain knowledge.