This summary provides an overview of the tutorial on building an AI buddy with Go, OpenAI, Retell AI, and Twilio Programmable Voice. The tutorial guides users through setting up a project directory, installing required packages, and creating a Go app that uses OpenAI to generate chatbot responses and converts them into human-like speech using Retell AI API. Twilio Programmable Voice is used to initiate voice calls and connect the user with the AI buddy. The application also includes a websocket route for handling messages from the AI buddy and generating AI responses using the OpenAI API. The tutorial concludes by connecting the server to Twilio and creating a Retell AI agent, setting up the webhook URL, and registering the changes in the Twilio Console.