CNN  —  Elon Musk’s artificial intelligence company xAI issued a lengthy apology Saturday for a series of violent and antisemitic posts from its Grok chatbot this week, blaming a system update. “First off, we deeply apologize for the horrific behavior that many experienced,” the company wrote. xAI says a system update had chatbot Grok refer to “existing X user posts; including when such posts contained extremist views,” caused it to issue responses that praised Adolf Hitler, repeated conspiracy