By 2026, CLI coding agents have evolved beyond simple autocomplete. Tools like Claude Code, Codex CLI, Gemini CLI, OpenCode, and Aider now plan features, modify multiple files, run tests, and interact with Git directly from the terminal. They operate where developers already work, minimizing context switching and acting as a pair programmer within the command line.

These agents cater to different workflows. Claude Code excels at deep reasoning for complex codebases. Codex CLI offers lightweight access to OpenAI models for quick scripts. Gemini CLI provides fast, responsive interactions for frontend tasks. OpenCode prioritizes flexibility and privacy, supporting over 75 model providers. Aider is Git-first, ideal for multi-file refactoring and commits.

Choosing the right tool depends on your habits. For architectural work, consider Claude Code. For minimal friction, try Codex CLI. Developers often use multiple agents, switching based on the task. Integrating one into an existing Git workflow is the best starting point. Review all changes and treat the agent as a collaborator.