OpenCode is an open-source AI coding agent that works in the terminal and on the desktop, helping developers write, review and change code with natural-language instructions. It includes built-in agents for building and for read-only planning, so it can suit both everyday development and careful exploration of an unfamiliar codebase.
Label: Open-source
Platform: Windows, macOS and Linux
Best for: AI-assisted coding in the terminal or desktop app
Replaces: Paid AI coding assistants such as GitHub Copilot
Verified: 30 October 2026