Head to head / Harness
Codex CLI vs Reasonix
Codex CLI: OpenAI's open-source coding agent for the terminal, with cloud and app-server counterparts. Reasonix: Open-source coding agent for the terminal, desktop app, browser and VS Code.
| Fact | Harness | Harness |
|---|---|---|
| Kind | Harness | Harness |
| Status | Active | Active |
| Source | Open source | Open source |
| License | Apache-2.0 | MIT |
| 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 | Free · Free |
| Model access | Your subscription, Your API key | Your API key |
| Platforms | macOS, Linux, Windows | macOS, Linux, Windows |
| Interfaces | CLI | CLI, TUI, Desktop, Web, IDE extension |
| Install | curl -fsSL https://chatgpt.com/codex/install.sh | sh | npm install -g reasonix |
| GitHub | ★ 130k · checked 2026-10-18 | ★ 35.8k · 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