There is no single best agentic CLI. Here is how Claude Code, Codex, Cursor, Gemini, Copilot, and opencode hold up over a long autonomous loop, and how to pick per task.
Point Ralph at Google’s Gemini CLI with one flag, pick a model after the separator, log in once inside the sandbox, and let it grind through your task list with a fresh context each iteration.
Point Ralph at the headless cursor-agent with one flag, log in once inside the sandbox, pass a model after the separator, and review a finished diff in the morning.
Wire OpenAI’s Codex CLI into a Ralph loop with one flag, pass model and approval flags after the separator, and let it grind through your task list inside a sandbox.
Run Claude Code in an autonomous loop that keeps a fresh context every iteration, stops on an explicit completion promise, and stays sandboxed.
An agentic coding CLI is an AI agent you drive from the terminal. Here is the field guide to the six Ralph supports and how to run any of them in a loop.
