Head to head / Harness
Codex CLI vs Gemini CLI
Codex CLI: OpenAI's open-source coding agent for the terminal, with cloud and app-server counterparts. Gemini CLI: Google's open-source terminal coding agent, with IDE integration and a free usage tier.
| Fact | Harness | Harness |
|---|---|---|
| Kind | Harness | Harness |
| Status | Active | Active |
| Source | Open source | Open source |
| License | Apache-2.0 | Apache-2.0 |
| Pricing | Freemium · Free · Go $8/mo · Plus $20/mo · Business Standard $25/mo · Pro $100/mo · Business Premium $125/mo · API Key Pay as you go | Freemium · Free · Google AI Pro $19.99/mo · Google AI Ultra (5x) $100/mo · Google AI Ultra (20x) $200/mo · API key Pay as you go |
| Model access | Your subscription, Your API key | Your subscription, Your API key, Vendor credits |
| Platforms | macOS, Linux, Windows | macOS, Linux, Windows |
| Interfaces | CLI | CLI, IDE extension |
| Install | curl -fsSL https://chatgpt.com/codex/install.sh | sh | npm install -g @google/gemini-cli |
| GitHub | ★ 130k · checked 2026-10-18 | ★ 107k · checked 2026-10-18 |
| Last verified | 2026-10-18 | 2026-10-18 |
| Worktrees | ✓ | ✓ |
| Parallel agents | ✓ | ? |
| Subagents | ✓ | ✓ |
| MCP | ✓ | ✓ |
| Remote access | ✓ | ? |
| Cloud sandbox | ✓ | ? |
| Diff review | ✓ | ? |
| Plan mode | ✓ | ✓ |
✓ yes ✗ no ? not verified yet
How we check facts More head to heads