7 CLI Coding Agents Ranked by Real Terminal-Bench Scores

Codex CLI leads the Terminal-Bench 2.0 leaderboard with a score of 82.2% among named CLI coding agents, using GPT-5.5, as of June 2026, demonstrating superior autonomous performance in executing commands and completing tasks without human intervention. Terminal-Bench 2.0, which evaluates the capability of CLI agents to perform tasks such as running commands, reading outputs, and error recovery, confirms this ranking as the most relevant for terminal-native agents, while the overall leaderboard is topped by the research harness "vix" running Claude Opus 4.7 at 90.2%. Codex CLI, associated with ChatGPT Plus, is recognized for its verifiable benchmark score, distinct from marketing claims, and offers a competitive edge in pricing and performance. Other agents like Claude Code, Gemini CLI, OpenCode, and Aider provide varying benefits, such as long unattended runs, a generous free tier, model flexibility, and git-native integrations, respectively. The evaluation emphasizes that a CLI agent's performance is a combination of the model and the harness used, suggesting that agents like OpenCode and Aider, which allow model flexibility, can reach top leaderboard scores depending on the model applied.

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