Head to head / Harness
Codex CLI vs GitHub Copilot CLI
Codex CLI: OpenAI's open-source coding agent for the terminal, with cloud and app-server counterparts. GitHub Copilot CLI: GitHub's terminal coding agent, with plan mode, subagents, and MCP.
| Fact | Harness | Harness |
|---|---|---|
| Kind | Harness | Harness |
| Status | Active | Active |
| Source | Open source | Closed source |
| License | Apache-2.0 | proprietary |
| 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 · Copilot Free Free · Copilot Pro $10/mo · Copilot Business $19/mo · Copilot Enterprise $39/mo · Copilot Pro+ $39/mo · Copilot Max $100/mo |
| Model access | Your subscription, Your API key | Your subscription, Your API key, Local models |
| Platforms | macOS, Linux, Windows | macOS, Linux, Windows |
| Interfaces | CLI | CLI, TUI |
| Install | curl -fsSL https://chatgpt.com/codex/install.sh | sh | npm install -g @github/copilot |
| GitHub | ★ 130k · checked 2026-10-18 | ★ 11.3k · 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