8 min readAI Dev Review
Gemini CLI vs Codex CLI: terminal agent showdown
Two Google-and-OpenAI terminal agents, one week of unattended work. Which one earned its keep?
Gemini CLICodex CLITerminal
Terminal-first agents are the quiet workhorse of AI coding. We put Gemini CLI and Codex CLI on the same weekly maintenance tasks — dependency bumps, flaky test triage, docs updates — and let them run.
Head to head
- Gemini CLI: cheaper per run, faster on read-heavy tasks, weaker at complex refactors.
- Codex CLI: pricier, but stronger planning and better test writing.
- Both handled dependency PRs cleanly; both stumbled on tasks that required cross-repo context.
Verdict
Use Gemini CLI as the always-on watcher for cheap, safe tasks. Reach for Codex CLI when the change actually matters.
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