The OpenAI Developer Day highlights Custom GPTs as a way to make your own sophisticated AI chatbots powered by GPT-4. GPT-4 is the most potent AI model ever developed, with 1.8 trillion parameters. It is said to be on the path to AGI (Artificial General Intelligence). It will equal or surpass our intelligence. In terms of Custom GPTs, you can include your own instructions. You can have your own reference data. You can ask the user to import information. All you need to do is to explain in English what you want the application to do. Sam Altman highlights a number of apps that OpenAI has developed.