opencode-anthropic-login-via-cli

OpenCode plugin that lets you use Anthropic models with your Claude Pro/Max subscription. No API key required.

Features

Binary Introspection

Reads the Claude CLI binary to extract current beta headers, OAuth scopes, and version info. Stays in sync with Anthropic's API automatically instead of relying on hardcoded values.

Cross-Platform Support

Works on macOS, Linux, and Windows.

Auto Login

If you have Claude CLI installed and logged in, the plugin picks up your credentials automatically:

• macOS: System Keychain
• Linux / Windows: ~/.claude/.credentials.json

CCS Support

If you use CCS for multiple Claude Code instances, each instance in ~/.ccs/instances/ is detected and shows up as a separate auth method.

Browser Login

Opens an OAuth flow through claude.ai for users without the CLI. Log in, paste the code, done.

Token Refresh

Handles expired tokens automatically. Falls back to the CLI if the standard refresh fails.

Request Patching

Patches requests so OpenCode talks to Anthropic's API the same way Claude Code does.

Install

Add to your opencode.json:

{
  "plugin": ["opencode-anthropic-login-via-cli"]
}

Then open OpenCode and go to Connect Provider > Anthropic.

Auth Methods

| Method | Label | How it works | | ------- | ------------------------ | ------------------------------------------------------- | | Auto | Claude Code (auto) | Reads existing CLI credentials from Keychain/filesystem | | CCS | CCS (instance-name) | Auto-detects each CCS instance in ~/.ccs/instances/ | | Browser | Claude Pro/Max (browser) | OAuth flow via claude.ai with PKCE | | API Key | API Key (manual) | Standard Anthropic API key |

License

MIT