Top 5 Terminal AI Coding Agents in 2026

TL;DR: Claude Code for complex refactors if you have the budget. Gemini CLI for the best free tier (now with Plan Mode). Aider if you want multi-provider flexibility and the best git workflow. Terminal AI coding agents have moved past the novelty stage. Developers are dropping IDE-integrated copilots for command-line tools that can reason across entire codebases, run shell commands, and commit changes autonomously. March 2026 made this space even more competitive: Google shipped Plan Mode for Gemini CLI on March 11, and the open-source community keeps pushing Aider and OpenCode forward. Meanwhile, Claude Code and Codex CLI continue to battle for the premium end of the market. Here are the five terminal AI coding agents worth evaluating right now, compared side-by-side. The Comparison Table Feature Claude Code Codex CLI Gemini CLI Aider OpenCode Maker Anthropic OpenAI Google Open-source Open-source Open-source No Yes (Apache 2.0) Yes (Apache 2.0) Yes (Apache 2.0) Yes (MIT) Default model