The latest version of Elon Musk’s artificial intelligence chatbot Grok is echoing the views of its billionaire creator, so much so that it will sometimes search online for Musk’s stance on an issue before offering up an opinion. The unusual behavior of Grok 4, the AI model that Musk’s company xAI released late Wednesday, has surprised some experts. 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. Musk’s deliberate efforts...