IT’S BEEN HAILED as a cultural phenomenon and at the moment, it’s all anyone can talk about. It’s ChatGPT, the language model created by OpenAI, a San Francisco-based artificial-intelligence company. We touched on the subject briefly before, but will take a more in-depth look today at the fastest-growing internet service ever (it reached 100 million users in January, just two months after its launch at the end of November 2022).