Opencode is an open-source AI coding agent designed specifically for the terminal, offering a native, responsive, and themeable terminal user interface (TUI). It supports multiple AI models, including Claude, OpenAI, Google, and local models, allowing developers to choose the best fit for their needs. With features like multi-session support, automatic loading of the appropriate Language Server Protocols (LSPs) for enhanced code understanding, and the ability to share session links for collaboration or debugging, Opencode streamlines the development process directly within the terminal environment.