opencode, built by Anomaly since 2025, runs as an open-source coding agent across the terminal, an IDE extension, and a desktop app, and has grown into one of the largest projects in this specific space, reporting over 160,000 GitHub stars, 900 contributors, and more than 7.5 million monthly developers using it.
A specific practical feature sets it apart from most competitors: it can connect to a GitHub Copilot or ChatGPT Plus and Pro account a developer already pays for, rather than requiring separate API billing on top of an existing subscription, alongside support for more than seventy-five LLM providers through Models.dev for those who want to bring their own model access instead. The company states it doesn't store code or context data, a specific privacy commitment.
opencode is free and open source. For a developer who wants one of the most actively developed, widely adopted open-source agents available, with the specific option to reuse an AI subscription they already pay for rather than adding new API costs, opencode's scale and account-reuse flexibility are the clearest reasons to choose it.
