During OpenAI's Dev Day, Romain Huet demonstrated the capabilities of the new o1 model by live building an iPhone iOS app in approximately 30 seconds using a single prompt. The demo showcased the integration of ChatGPT desktop and o1-preview, highlighting the potential for rapid app development. The app being built was designed to track the International Space Station (ISS), with Xcode and ChatGPT used in tandem. The model was used in Cursor. Videos from the event are expected to be released after its conclusion.