Elon Musk's AI startup xAI has debuted its AI tool 'Grok', which Musk said has "real-time knowledge of the world" via the X (formerly Twitter) platform. Unlike OpenAI's ChatGPT's to-the-point answers, Grok's system is designed to have a little humour in its responses. "It (Grok) will also answer spicy questions that are rejected by most other AI systems," Musk claimed.