Built using huge amounts of computing power at a Tennessee data center, Grok is Musk's attempt to outdo rivals such as OpenAI's ChatGPT and Google's Gemini in building an AI assistant that shows its reasoning before answering a question.

xAI issued a lengthy apology Saturday for a series of violent and antisemitic posts from its Grok chatbot this week, blaming a system update.

Elon Musk’s SpaceX has agreed to invest $2 billion in his artificial-intelligence company xAI, investors close to the companies said, nearly half of the Grok chatbot maker’s recent equity raise.