Exo is an experimental software project designed to harness existing household devices such as iPhones, iPads, Androids, Macs, and Linux to unite them as a powerful GPU to run AI models. It supports a variety of popular models such as LLaMA and features dynamic model partitioning that optimally divides models based on the current network topology and device resources. Additionally, Exo provides APIs compatible with ChatGPT, allowing the use of Exo to run models in applications with just a simple line of code change.