OpenAI's ChatGPT app has surpassed 500,000 downloads in just 6 days. The app is only available to iOS and iPad users in the US, but it has since been expanded to 11 more countries including Albania, Croatia, France, Germany, Ireland, Brazil, South Korea, New Zealand, the UK, Nigeria, and Nicaragua. ChatGPT is a large language model that can generate text, translate languages, write different kinds of creative content, and answer your questions in an informative way. It is based on OpenAI's GPT-4 language model, which is one of the most advanced language models in the world. The app is available for free, but there is also a premium subscription that offers additional features, such as plugin support, instant replies, and the elimination of wait times. iOS and iPad users will also be able to ask questions of ChatGPT using their voice.