OpenAI, which Elon Musk helped to co-found back in 2015, is the San Francisco-based startup that created ChatGPT. The company opened ChatGPT up for public testing in November 2022. In under a week, the artificial intelligence model amassed over a million users, according to OpenAI CEO, Sam Altman. By the end of January, ChatGPT was averaging about 13 million visitors per day. Users have had ChatGPT write everything from essays, to lyrics and even correct computer code.