The tutorial aims to create an open-source ChatGPT interface using Llama 2 and Chainlit, building upon the capabilities of GPT-3.5, a closed-source large language model that powers ChatGPT. The key features of this open-source version include high-quality output comparable to GPT-3.5, conversation in context, streaming output, prompt history, and security and privacy features. Users can deploy Llama-2-chat with just a few clicks from Baseten's model library, set up Chainlit, and run the cookbook to build the chat UI on localhost. The tutorial focuses on three key details that make this chatbot work: using conversation history and context, streaming Llama 2 output, and stripping unneeded characters. The project demonstrates how open-source tools can be used to create a compelling user experience similar to ChatGPT.