Elon Musk’s artificial intelligence startup xAI showed off the updated Grok-3 model, showcasing a version of the chatbot technology that the billionaire has said is the “smartest AI on Earth.”Across math, science and coding benchmarks, Grok-3 beats Alphabet Inc.’s Google Gemini, DeepSeek’s V3 model, Anthropic’s Claude and OpenAI’s GPT-4o, the company said via a live stream on Monday. Grok-3 has “more than 10 times” the compute power of its predecessor and completed pre-training in early January,...