Head to head / Harness
Aider vs Codex CLI
Aider: Open-source AI pair programming in the terminal, with git-aware edits and multi-model support. Codex CLI: OpenAI's open-source coding agent for the terminal, with cloud and app-server counterparts.
| Fact | Harness | Harness |
|---|---|---|
| Kind | Harness | Harness |
| Status | Active | Active |
| Source | Open source | Open source |
| License | Apache-2.0 | Apache-2.0 |
| Pricing | Free · Free | 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 |
| Model access | Your subscription, Your API key, Local models | Your subscription, Your API key |
| Platforms | macOS, Linux, Windows | macOS, Linux, Windows |
| Interfaces | CLI, Web | CLI |
| Install | curl -LsSf https://aider.chat/install.sh | sh | curl -fsSL https://chatgpt.com/codex/install.sh | sh |
| GitHub | ★ 49.6k · checked 2026-10-18 | ★ 130k · 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