Paste this into your AI agent (Claude Code, Cursor, Copilot, etc.):

Fetch https://raw.githubusercontent.com/griffinmartin/opencode-claude-auth/main/installation.md and follow every step exactly as written.

Install with Homebrew (macOS)

brew tap griffinmartin/opencode-claude-auth https://github.com/griffinmartin/opencode-claude-auth.git
brew install opencode-claude-auth

Then add to the plugin array in your opencode.json:

{
  "plugin": ["opencode-claude-auth"]
}

Manual install

npm install -g opencode-claude-auth

Then add to the plugin array in your opencode.json:

{
  "plugin": ["opencode-claude-auth"]
}

Usage

Just run OpenCode. The plugin handles auth automatically — it reads your Claude Code credentials, provides them to the Anthropic API, and refreshes them in the background. If your credentials aren't OAuth-based, the plugin falls through to standard API key auth.

Supported models

15 supported models. Run pnpm run test:models to verify against your account.

| Model | | -------------------------- | | claude-3-haiku-20240307 | | claude-haiku-4-5 | | claude-haiku-4-5-20251001 | | claude-opus-4-0 | | claude-opus-4-1 | | claude-opus-4-1-20250805 | | c...