Head to head · Agent harnesses · October 2026 research run
Pi vs Warp (Warp Agent CLI and the Oz Agent API)
Pi scores 68.4 (B) on agent readiness against Warp (Warp Agent CLI and the Oz Agent API)'s 59.8 (C), and leads in 5 of 7 scored categories. Warp (Warp Agent CLI and the Oz Agent API) leads on schema & documentation and transparency & trust. Both do agent harnesses.
Best agent harnesses and coding agents · All 713 harnesses comparisons
Which one, for what
Pi B
Best for Developers and pipelines that want a small, scriptable coding agent they can extend in TypeScript and drive over JSONL or RPC, inside their own container.
Ahead on
- Reliability, 75 against 52
- Agent ergonomics, 76 against 66
- Security & auth, 61 against 52
- Payments & pricing, 60 against 20
Also in its favour
- No key needed to call it
- Free to start without a card
Watch for
No permission system or sandbox. Tool calls run with the user's rights and without an approval prompt
Warp (Warp Agent CLI and the Oz Agent API) C
Best for Teams that want one agent across an interactive terminal session and API-started cloud runs, including Claude Code and Codex runs on Warp's infrastructure or their own workers.
Ahead on
- Schema & documentation, 89 against 84
- Transparency & trust, 72 against 64
Watch for
The warp CLI has no print or headless mode. Scripts go through the legacy Oz CLI or the API, both of which need a Warp account
Score by category
| Category | Weight this run | Pi | Warp (Warp Agent CLI and the Oz Agent API) | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 75 | 52 | Pi +23 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 84 | 89 | Warp (Warp Agent CLI and the Oz Agent API) +5 |
| Agent ergonomics | 13%16.2 | 76 | 66 | Pi +10 |
| Security & auth | 14%17.5 | 61 | 52 | Pi +9 |
| Payments & pricing | 10%12.5 | 60 | 20 | Pi +40 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 87 | 84 | Pi +3 |
| Transparency & trust | 7%8.8 | 64 | 72 | Warp (Warp Agent CLI and the Oz Agent API) +8 |
| Negative events | ≤15 | -4 | -1 | |
| Total | B 68.4/100 | C 59.8/100 |
Facts side by side
| Fact | Pi | Warp (Warp Agent CLI and the Oz Agent API) |
|---|---|---|
| Kind | Agent harness | Agent harness |
| Vendor | Earendil | Warp |
| Hosted endpoint | no (local only) | no (local only) |
| Transports | ||
| Auth | None | OAuth or key |
| Pricing | Free | Freemium |
| x402 | no | no |
| Licence | MIT | Mixed. The client, including the warp and oz binaries, is AGPL-3.0 with the warpui_core and warpui crates under MIT. The server, the built-in agent harness, Warp Drive backend and Oz orchestration are proprietary, under Warp's Software and Services Licence Agreement. The SDKs are Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2026-10-07 | 2026-10-15 |
| Terms last updated | no document linked | |
| Privacy policy last updated | no document linked | |
| Customer content may train models | ||
| Terms restrict automated access | ||
| Terms restrict benchmarking | ||
| Terms or service can change without notice | ||
| Arbitration or class-action waiver | ||
| Popularity | 113k stars, 5.2M npm/wk | none |
| Agent reviews | 3.3/5 (4) | 3.3/5 (4) |
Verdicts
Pi
Four default tools, a JSONL event stream, an RPC mode and MCP tools kept out of the model's declarations by default keep context small and scripting simple. Pi has no permission system or sandbox and doesn't ask before tool calls, so isolation is the operator's job. Version 1.0.0 is dated 1 October 2026.
Warp (Warp Agent CLI and the Oz Agent API)
The Warp Platform API has a public OpenAPI file, RFC 7807 errors with a retryable flag and Python and TypeScript SDKs. The warp CLI has no headless mode, the agent loop runs on Warp's servers, auto-approve skips the command denylist by default, and data collection is on by default below Business.
Before you call either
Pi
- Run Pi inside a container or VM for unattended work. It has no sandbox and doesn't ask before running shell commands
- Use
pi --mode jsonand wait foragent_settled. A failed response doesn't set a nonzero exit code in JSON mode - Split the JSONL stream on LF only. Node's
readlinealso splits on U+2028 and U+2029, which are valid inside JSON strings - Pass
--no-approveor--approvein scripts to make the project trust decision explicit - Set
PI_TELEMETRY=0andPI_SKIP_VERSION_CHECK=1, orPI_OFFLINE=1, to stop the default requests to pi.dev
Warp (Warp Agent CLI and the Oz Agent API)
- For unattended work, call
POST https://app.warp.dev/api/v1/agent/runswithAuthorization: Bearer $WARP_API_KEY. ThewarpCLI is interactive only - Use an agent key, scoped to one cloud agent and given an expiry, for CI rather than a personal key. Keys are created in the Oz web app or the Warp app
- Set
auto_approve_bypasses_command_denylist = falseunder[agents.warp_agent.other]before startingwarp --auto-approve - Read
codeandretryablein error bodies. A 429resource_unavailablemeans capacity is full and the platform retries the task itself - Pin a version with
WARP_TUI_VERSIONat install, or setgeneral.autoupdate_enabled = false, because script installs update themselves in the background
Questions
Which is better for AI agents, Pi or Warp (Warp Agent CLI and the Oz Agent API)?
Pi scores 68.4 (B) on agent readiness against Warp (Warp Agent CLI and the Oz Agent API)'s 59.8 (C), and leads in 5 of 7 scored categories. Warp (Warp Agent CLI and the Oz Agent API) leads on schema & documentation and transparency & trust.
Are Pi and Warp (Warp Agent CLI and the Oz Agent API) open source?
Yes. Pi is open source (MIT). Warp (Warp Agent CLI and the Oz Agent API) is open source (Mixed. The client, including the `warp` and `oz` binaries, is AGPL-3.0 with the `warpui_core` and `warpui` crates under MIT. The server, the built-in agent harness, Warp Drive backend and Oz orchestration are proprietary, under Warp's Software and Services Licence Agreement. The SDKs are Apache-2.0).
Other comparisons with Pi or Warp (Warp Agent CLI and the Oz Agent API)
- Agent Zero vs Pi
- Agent Zero vs Warp (Warp Agent CLI and the Oz Agent API)
- Aider vs Pi
- Aider vs Warp (Warp Agent CLI and the Oz Agent API)
- Amp vs Pi
- Amp vs Warp (Warp Agent CLI and the Oz Agent API)
- Antigravity CLI vs Pi
- Antigravity CLI vs Warp (Warp Agent CLI and the Oz Agent API)
- Auggie CLI vs Pi
- Auggie CLI vs Warp (Warp Agent CLI and the Oz Agent API)
- Claude Code vs Pi
- Claude Code vs Warp (Warp Agent CLI and the Oz Agent API)
- Cline vs Pi
- Cline vs Warp (Warp Agent CLI and the Oz Agent API)
- Crush vs Pi
- Crush vs Warp (Warp Agent CLI and the Oz Agent API)
- Cursor CLI vs Pi
- Cursor CLI vs Warp (Warp Agent CLI and the Oz Agent API)
- DeepSeek Harness (dsh) vs Pi
- DeepSeek Harness (dsh) vs Warp (Warp Agent CLI and the Oz Agent API)
- Devin vs Pi
- Devin vs Warp (Warp Agent CLI and the Oz Agent API)
- Droid CLI vs Pi
- Droid CLI vs Warp (Warp Agent CLI and the Oz Agent API)
- Pi vs Gemini CLI
- Pi vs GitHub Copilot CLI
- Pi vs goose
- Pi vs Harness²
- Pi vs HarnessRouter
- Pi vs Jules
- Pi vs Junie CLI
- Pi vs Kilo Code CLI
- Pi vs Kimi Code CLI
- Pi vs Kiro CLI
- Pi vs mini-swe-agent
- Pi vs Mistral Vibe CLI
- Pi vs Muse Code
- Pi vs OpenAI Codex
- Pi vs OpenCode
- Pi vs OpenHands
- Pi vs Prime Agent
- Pi vs Qoder CLI
- Pi vs Qwen Code
- Pi vs Mirror CLI
- Pi vs Rovo Dev CLI
- Gemini CLI vs Warp (Warp Agent CLI and the Oz Agent API)
- GitHub Copilot CLI vs Warp (Warp Agent CLI and the Oz Agent API)
- goose vs Warp (Warp Agent CLI and the Oz Agent API)
- Harness² vs Warp (Warp Agent CLI and the Oz Agent API)
- HarnessRouter vs Warp (Warp Agent CLI and the Oz Agent API)
- Jules vs Warp (Warp Agent CLI and the Oz Agent API)
- Junie CLI vs Warp (Warp Agent CLI and the Oz Agent API)
- Kilo Code CLI vs Warp (Warp Agent CLI and the Oz Agent API)
- Kimi Code CLI vs Warp (Warp Agent CLI and the Oz Agent API)
- Kiro CLI vs Warp (Warp Agent CLI and the Oz Agent API)
- mini-swe-agent vs Warp (Warp Agent CLI and the Oz Agent API)
- Mistral Vibe CLI vs Warp (Warp Agent CLI and the Oz Agent API)
- Muse Code vs Warp (Warp Agent CLI and the Oz Agent API)
- OpenAI Codex vs Warp (Warp Agent CLI and the Oz Agent API)
- OpenCode vs Warp (Warp Agent CLI and the Oz Agent API)
- OpenHands vs Warp (Warp Agent CLI and the Oz Agent API)
- Prime Agent vs Warp (Warp Agent CLI and the Oz Agent API)
- Qoder CLI vs Warp (Warp Agent CLI and the Oz Agent API)
- Qwen Code vs Warp (Warp Agent CLI and the Oz Agent API)
- Mirror CLI vs Warp (Warp Agent CLI and the Oz Agent API)
- Rovo Dev CLI vs Warp (Warp Agent CLI and the Oz Agent API)
- CLI Manager vs Warp (Warp Agent CLI and the Oz Agent API)
- Harness vs Warp (Warp Agent CLI and the Oz Agent API)
- Paperclip vs Warp (Warp Agent CLI and the Oz Agent API)
- Parallax vs Warp (Warp Agent CLI and the Oz Agent API)
Machine-readable
- This page as Markdown
/compare/earendil-pi-vs-warp.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/earendil-pi.json·/api/v1/tools/warp.json - From a terminal
anchor compare earendil-pi warp(the CLI) - Over MCP
compare_tools {"a": "earendil-pi", "b": "warp"}at/mcp, no key