Pi vs OpenCode
A minimal, reshapeable agent harness versus a batteries-included terminal agent — compared across design, models, and automation.
Updated August 28, 2026 · Independent comparison — Pi, OpenCode are separate products.
Pi
A minimal, reshapeable open-source coding-agent harness
Pi, by earendil-works (Mario Zechner), is an MIT-licensed, terminal-first coding-agent harness built around a deliberately small core. The coding-agent CLI ships a minimal four-tool base — Read, Write, Edit, and Bash — and everything else is added through TypeScript extensions, skills, prompt templates, themes, and shareable Pi packages. It rides a unified LLM API across 20+ providers (Claude, GPT-5, Gemini, Grok, DeepSeek) with BYOK, and runs in four modes — interactive, print/JSON, an RPC mode for process integration, and an SDK for embedding in your own apps. MCP is not built in but can be added via an extension. In a June 2026 Terminal-Bench 2.0 bakeoff, Pi-Code 0.73.1 was benchmarked head-to-head against OpenCode 1.17.9. The appeal is a harness you reshape around your own workflow so it survives model and provider churn.
OpenCode
Anomaly's terminal-first open-source coding agent
OpenCode is an MIT-licensed, terminal-first coding agent maintained by Anomaly, with a polished TUI plus a desktop app and editor extensions for VS Code, Cursor, and Zed. It supports 75+ model providers and BYOK, with an optional OpenCode Zen model gateway and the $10/month OpenCode Go open-weight subscription. It has Plan and Build modes (toggled with Tab), subagents invoked with @, built-in LSP and MCP support, a plugin and skills system, and headless automation via opencode run plus an opencode serve HTTP server and optional web UI. It runs on macOS, Linux, and Windows (WSL recommended).
Bottom line
A minimal, reshapeable agent harness versus a batteries-included terminal agent — compared across design, models, and automation. Choose Pi if you want a minimal, hackable harness you can reshape around your own workflow; choose OpenCode if you want built-in MCP, LSP, Plan/Build modes, and subagents without assembling them.
License & Project
| Feature | Pi | OpenCode |
|---|---|---|
| License | MIT | MIT |
| Maintainer | earendil-works (Mario Zechner) | Anomaly |
| Language | TypeScript | TypeScript |
| Cost | Free (BYOK) | Free (BYOK); optional Zen / Go |
Architecture & Design
| Feature | Pi | OpenCode |
|---|---|---|
| Core tool set | Minimal 4-tool core (Read/Write/Edit/Bash) | Full built-in toolset |
| Design philosophy | Small core, reshape via extensions | Batteries-included agent |
| Terminal TUI | ✓ | ✓ |
| Unified multi-provider API | ✓ | ✓ |
Models & Providers
| Feature | Pi | OpenCode |
|---|---|---|
| Provider reach | 20+ (Claude, GPT-5, Gemini, Grok, DeepSeek) | 75+ providers |
| Bring-your-own key | ✓ | ✓ |
| Managed / bundled model plan | ✗ | OpenCode Zen + Go ($10/mo) |
| Model switching | ✓ | ✓ |
Extensibility
| Feature | Pi | OpenCode |
|---|---|---|
| MCP support | Via extension (not built-in) | Built-in MCP servers |
| Extensions / packages | TypeScript extensions, Pi packages | Plugins |
| Skills | ✓ | ✓ |
| Prompt templates / themes | ✓ | Custom commands |
| Subagents / parallel work | Via extensions (agent chains) | Subagents (@) |
Automation & Platforms
| Feature | Pi | OpenCode |
|---|---|---|
| Headless / embedding | RPC mode + SDK; print/JSON | opencode run + serve |
| Editor extensions | ✗ | VS Code, Cursor, Zed |
| Web UI | Not stated | opencode web |
| LSP awareness | Via extensions | ✓ |
| Platforms | macOS, Linux, Windows | macOS, Linux, Windows (WSL) |
The Verdict
Choose Pi if...
- ✓You want a minimal, hackable harness you can reshape around your own workflow.
- ✓You want a small four-tool core plus TypeScript extensions, skills, and packages.
- ✓You switch models often and want a harness that survives provider churn.
- ✓You want to embed an agent via its headless RPC mode.
- ✓You value MIT-licensed simplicity over a batteries-included tool.
Choose OpenCode if...
- ✓You want built-in MCP, LSP, Plan/Build modes, and subagents without assembling them.
- ✓You want the widest provider reach (75+) and an optional managed model plan.
- ✓You want editor extensions, a headless HTTP server, and an optional web UI.
- ✓You want a large, active community and plugin ecosystem.
- ✓You'd rather start productive than build your own harness.
Frequently Asked Questions
What is the difference between Pi and OpenCode?
Pi, by earendil-works (Mario Zechner), is an MIT-licensed, terminal-first coding-agent harness built around a deliberately small core. OpenCode is an MIT-licensed, terminal-first coding agent maintained by Anomaly, with a polished TUI plus a desktop app and editor extensions for VS Code, Cursor, and Zed.
Should I choose Pi or OpenCode?
Choose Pi if you want a minimal, hackable harness you can reshape around your own workflow. Choose OpenCode if you want built-in MCP, LSP, Plan/Build modes, and subagents without assembling them.
1DevToolBring your harness to a multi-agent desk
Pi and OpenCode take opposite bets — a minimal reshapeable core versus a batteries-included agent. 1DevTool doesn't replace either; it runs them, and other CLI agents like Claude Code, Codex CLI, Gemini CLI, and Cline, side by side in persistent terminals. Bring your own keys, no lock-in, plus a built-in HTTP client, 13-engine database client, and embedded browser wired into Send-to-AI. One-time $29, no subscription.