Pi

license

MIT(OSI)

source

public

core features withheld

no — the tree at 42a3497 carries one root MIT LICENSE and no ee/, enterprise/, commercial/ or proprietary/ path, and every published package in it declares MIT. Earendil has announced Fair Source and proprietary add-on tiers but has not built them

Pi is MIT licensed, and its public repository holds the whole agent and the libraries it is built from, so it builds and runs from published source with no account. Earendil has said future commercial add-ons may be Fair Source or proprietary, but none exists yet, and the same statement commits the core to MIT.

• https://mariozechner.at/posts/2026-04-08-ive-sold-out/ recorded 2026-10-09

  The creator's post says "pi is MIT licensed. It will stay MIT licensed", lists "MIT (the core): pi as you know it. MIT, forever.", "Fair Source (value-add features): Some future commercial features will be Fair Source licensed." and "Proprietary (enterprise)", and adds "We haven't built tiers 2 and 3 yet."

• https://raw.githubusercontent.com/earendil-works/pi/main/LICENSE recorded 2026-10-09

  The root LICENSE is the MIT License text, "Copyright (c) 2025 Mario Zechner".

• https://raw.githubusercontent.com/earendil-works/pi/main/README.md recorded 2026-10-09

  The README lists the Pi CLI and its supporting libraries as packages of the monorepo, documents building and running from source and building standalone binaries from release source, and closes "## License MIT"; no paid tier or license key is mentioned.

• https://registry.npmjs.org/@earendil-works/pi-coding-agent/latest recorded 2026-10-09

  The npm record for @earendil-works/pi-coding-agent 1.1.0 declares "license": "MIT", a repository of earendil-works/pi under packages/coding-agent, and the pi command.

Adoption is the trailing month of npm downloads of the coding agent under its current name and its deprecated earlier one, which existing installs still pull. They are separate packages and neither depends on the other, so the sum counts no download twice. Installs through the pi.dev script and Nix are not counted.

• https://api.npmjs.org/downloads/point/last-month/@earendil-works/pi-coding-agent recorded 2026-10-09

  14,900,030 downloads of @earendil-works/pi-coding-agent between 2026-09-08 and 2026-10-07

• https://api.npmjs.org/downloads/point/last-month/@mariozechner/coding-agent recorded 2026-10-09

  31 downloads of @mariozechner/coding-agent between 2026-09-08 and 2026-10-07

• https://api.npmjs.org/downloads/point/last-month/@mariozechner/pi-coding-agent recorded 2026-10-09

  3,464,463 downloads of @mariozechner/pi-coding-agent between 2026-09-08 and 2026-10-07

• https://registry.npmjs.org/@mariozechner/pi-coding-agent/latest recorded 2026-10-09

  The last release under the old name, 0.73.1, carries the deprecation "please use @earendil-works/pi-coding-agent instead going forward" and depends only on @mariozechner/pi-* libraries, not on the new package.

Pi covers the core of a terminal coding agent, with many model providers, branchable sessions, built-in MCP and an SDK, and leaves sub-agents, plan mode and permissions to extensions by design. It sits a step below OpenHands, which runs agents in a sandboxed runtime and publishes benchmark results, while Pi runs with the user's own permissions and has no benchmark of its own.

• https://earendil.com/posts/pi-1-0/ recorded 2026-10-09

  The Pi 1.0 announcement lists "Codemode (native support for MCP, and non-LLM models like Jev and image models)", "Deferred tool loading" and "Full-screen mode by default".

• https://pi.dev/ recorded 2026-10-09

  The homepage lists "15+ providers, hundreds of models" with mid-session switching, says "Sessions are stored as trees. Use /tree to navigate to any previous point", and "MCP is built in, and Codemode lets agents compose tool calls".

• https://raw.githubusercontent.com/earendil-works/pi/main/README.md recorded 2026-10-09

  The README says "Pi ships with powerful defaults but skips features like sub-agents and plan mode", offers interactive, print or JSON, RPC and SDK use, and states "Pi does not include a built-in permission system"; no benchmark figure.