The article introduces Alpaca.cpp, a project that allows running an instruction-tuned chat-style LLM on a local device, such as a MacBook. It combines the LLaMA foundation model with an open reproduction of Stanford Alpaca and modifications to llama.cpp for a chat interface. The model can be run on various devices, including Macs, Windows, and Linux machines, with different CPU architectures. The project provides a way to locally run a fast ChatGPT-like model.