Billionaire Elon Musk's AI chatbot Grok has been accused of using ChatGPT-maker OpenAI's codebase after it cited the rival's use case policy in response to a user query. "We've a lot in common," ChatGPT said, sharing the screenshot on X. Musk replied, "Well, son, since you scraped all the data from this platform for your training, you ought to know."