Pi 1.5.0 released
A major release with faster streaming, extension update notifications, custom self-update commands, and support for GPT-6.1 Terra models.
What changed in 1.5.0
- Tool arguments now validate against JSON Schema on a new endpoint, affecting how TypeBox and plain JSON Schema tools handle validation messages and type coercion.
- Large tool calls parse incrementally and rendering reuses work across updates, improving responsiveness for code-heavy responses.
- Extensions can display changelogs after updates, with a setting to collapse them to one line per package.
- GPT-6.1 Terra models available through OpenAI providers, supporting tool search, adjustable thinking levels, and up to 500K context on Codex.
- Device-code login now opens verification pages automatically and copies codes, with settings to control these actions.
Check before you update
- Tool argument validation moved to /pi-schema endpoint; TypeBox features like Type.Refine() and Type.BigInt() no longer apply to tool arguments.
- Validation error messages changed from TypeBox format to pi-schema format with different field names.
- Plain JSON Schema tools now receive the same type coercion as TypeBox tools.
Summarised by AgentGid from Earendil Inc. (created by Mario Zechner)'s official release notes on GitHub, as reported there; read the original before relying on it. Price, status and release dates come from our daily data.
Pi at a glance
| What it is | Minimal, extensible open-source coding agent harness with interactive TUI, print/JSON, RPC and SDK modes, created by Mario Zechner and now maintained by Earendil Inc. It supports 15+ model providers through API keys or … |
|---|---|
| Latest version | 1.5.1, Nov 9, 2026. This page is about an earlier release. |
| Release pace | 5 stable releases in the last 30 days; 1.5.0 came 12 days after the previous one |
| Price | Free (OSS). Free and MIT-licensed; costs are those of the chosen model provider. Pi Durable (experimental) is also free per the 1.0 announcement. (checked Nov 5, 2026) |
| Downloads, last 7 days | 6.2M up 5.4% |
| Gid Score | 75 #5 in Terminal coding agents |