Zen is an open-source AI programming assistant extension for VS Code, designed to ensure that coding with AI is no longer hindered by costs. Instead of paying a monthly subscription fee, you log in to the AI platforms you already have accounts for; Zen will use that login information to leverage high-usage free AI resources, then integrate them directly into the chat frame next to the editor. Zen is customized to maintain a stable working session, minimizing disruptions from platform limitations. This is an option for students, self-learners, and anyone who enjoys coding with AI but does not have an investment budget. Zen is a completely client-side application: no intermediary servers, no data collection, and all source code is open for you to read, verify, fork, and customize to your own working style. Simply install it from Extensions in VS Code, log in to the AI platforms you want to use, and start coding.