Why are you still managing API keys…
when you already have Claude logged in?

OpenCode Claude Auth is a self-contained authentication plugin that lets you use Claude inside OpenCode using your existing Claude Code credentials — no API keys, no manual setup, no extra login.

It works by directly reading your authenticated Claude session and automatically handling everything behind the scenes.

You don’t configure anything.
You don’t manage tokens.
You just run OpenCode — and Claude works.

What Makes This Different

Most AI tools require:

• API keys

• Billing setup

• Environment variables

• Manual configuration

This does none of that.

It simply reuses your existing Claude Code login and plugs it into OpenCode automatically.

How It Works (Simplified)

• Reads your Claude credentials from:

  • macOS Keychain

  • or ~/.claude/.credentials.json (Linux/Windows)

• Injects authentication into Anthropic API requests

• Automatically refreshes tokens when needed

• Syncs credentials in the background

• Falls back safely if anything fails

Everything runs silently in the background.

Installation & Setup (Actual Plug & Play)

Step 1: Add Plugin

Open your OpenCode config:

~/.config/opencode/opencode.json

Add this:

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

Step 2: Run OpenCode

opencode

Step 3: Done

• Claude is automatically connected

• No API key needed

• No login required

That’s it. Literally plug and play.

Prerequisites

• Claude Code installed and logged in (claude run at least once)

• OpenCode installed

Best For

• Developers using OpenCode CLI

• Claude Pro / Max users

• Terminal-first workflows

• Indie hackers and builders

• Developers who hate setup friction

Real Power Features

• Zero-config authentication

• Automatic token refresh (no usage cost)

• Multi-account support (macOS)

• Background credential sync

• Works across macOS, Linux, Windows

• Supports multiple Claude models

Advanced Capability (Hidden Gem)

• Enables 1M token context (if your plan supports it)

• Smart retry system for API failures

• Debug logging for deep troubleshooting

• Full OAuth lifecycle handled internally

Why This Matters

This isn’t just a plugin.
It removes one of the biggest bottlenecks in AI dev workflows:

authentication friction

Less setup = faster builds = more shipping.

What You Get

• Seamless Claude integration inside OpenCode

• Zero API key dependency

• Fully automated auth system

• Clean developer experience