pi-opencode-provider

Warning: I built this entire extension before realizing pi already has built-in OpenCode support. I am apparently blind. This extension is not strictly required.

So why does this exist?

The built-in OpenCode models are statically generated at pi build time from models.dev. When OpenCode adds a new model, you have to wait for a pi release to see it.

This extension does runtime model discovery instead:

1. Fetches OpenCode's official /models endpoints directly at startup
2. Merges metadata from models.dev (context windows, pricing, reasoning support)
3. Registers the freshest model list with pi

New models show up without waiting for a pi release. Even if models.dev hasn't been updated yet, the extension fetches directly from OpenCode's API — new models are available immediately with best-effort default parameters (128k context, 16k max output).

Providers

This extension registers two providers that replace the built-in ones:

• opencode — replaces the built-in opencode (OpenCode Zen)
• opencode-go — replaces the built-in opencode-go (OpenCode Go)

Installation

pi install pi-opencode-provider

Configure pi

Run /login, choose Use a subscription, select OpenCode Zen or OpenCode Go, and paste your API key when prompted. Then run /model to pick a model.

Migrating from the built-in providers

If you previously used OpenCode with pi's built-in support (via OPENCODE_API_KEY env var or auth.json), you still need to run /login at least once. The extension registers an OAuth-based provider that rewrites per-model base URLs for Anthropic models — this only takes effect once your API key is stored through the /login flow.

Provider behavior

OpenCode Zen

Zen models are mapped automatically to the correct backend API:

• OpenAI Chat Completions
• OpenAI Responses
• Anthropic Messages
• Google Generative AI

OpenCode Go

Go models are exposed through the OpenAI-compatible chat completions API.

Model discovery

On startup, the extension:

1. Fetches the official model list from OpenCode's /models endpoint
2. Merges in metadata from models.dev
3. Registers the resolved models with pi, replacing the built-in ones

If the OpenCode model endpoint is unavailable, the extension falls back to models.dev. If metadata is still unavailable, conservative defaults (128k context, 16k max tokens) are used.

Development

npm install
npm run typecheck

License

MIT. See LICENSE.