CLI tools

The best open source command-line AI coding agents and harnesses in 2026, ranked by GitHub stars: DeepSeek Harness and OpenCode both at ~202k, Codex at 119k, Pi at 98k, plus vendor CLIs from xAI and Alibaba - with honest notes on licenses, local models, and which projects are dying.

The CLI coding agents worth using in October 2026: Claude Code on Opus 5.5, OpenAI Codex on GPT-6.1 Sol, OpenCode at 212k+ stars, Cursor CLI now part of SpaceX, Antigravity CLI after the Gemini CLI shutdown, and where Aider, Pi, DeepSeek Harness and the rest of the open-source field fit.