Head to head / Harness
Grok Build vs Pi
Grok Build: xAI's terminal coding agent, with plan mode, parallel subagents, and MCP. Pi: Minimal, extensible terminal agent from Earendil Works, designed to be customized.
| Fact | Harness | Harness |
|---|---|---|
| Kind | Harness | Harness |
| Status | Active | Active |
| Source | Open source | Open source |
| License | Apache-2.0 | MIT |
| Pricing | Freemium · Free · Plus $8/mo · Premium $30/mo · Super $100/mo · Ultra $200/mo | Free · Free |
| Model access | Your subscription, Your API key | Your subscription, Your API key, Local models |
| Platforms | macOS, Linux, Windows | macOS, Linux, Windows, Android |
| Interfaces | CLI, TUI | CLI, TUI, API |
| Install | curl -fsSL https://x.ai/cli/install.sh | bash | npm install -g --ignore-scripts @earendil-works/pi-coding-agent |
| GitHub | ★ 27.4k · checked 2026-10-18 | ★ 116k · 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