If there's one word that defined 2023, it was probably AI. While ChatGPT was first launched at the tail end of 2022, last year was marked by a significant expansion of not only ChatGPT itself, but also generative AI as a whole. Microsoft launched several tools using OpenAI's GPT language model, including the popular Bing Chat service, which is now simply called Microsoft Copilot. Now, Copilot has a dedicated app for iPhone devices.