griffinmartin/opencode-claude-auth

OpenCode 2 plugin that uses your existing Claude Code credentials — no separate login needed.

What it solves

This project allows users of the OpenCode 2 editor to authenticate with Anthropic’s API using their existing Claude Code subscription credentials. It eliminates the need to manage separate API keys or pay for additional usage if you are already a Claude Code subscriber.

How it works

The plugin acts as an authentication provider that reads OAuth tokens directly from your system's secure storage (macOS Keychain or local credential files). Once connected, it hooks into OpenCode's native Anthropic integration to inject your subscription identity, handle token refreshes automatically, and manage necessary API header translations (such as tool name mapping and beta flag management) to ensure compatibility with Claude's models.

Who it’s for

It is designed for developers who use OpenCode 2 and already have an active Claude Code subscription, providing a seamless way to use their existing account for AI-assisted coding without manual key management.

Highlights

  • Zero-key setup: Uses your existing Claude Code OAuth credentials directly from your system keychain.
  • Automatic Refresh: Handles token rotation automatically without requiring manual re-authentication.
  • Multi-account support: Automatically detects and allows selection between multiple Claude Code accounts on macOS.
  • Native Integration: Leverages OpenCode 2's built-in Anthropic provider for reliable streaming and prompt conversion.

Related

  • Project
    kristianvast/hermes-claude-auth

    hermes‑claude‑auth is a Python runtime patch that lets the hermes‑agent use a Claude Code subscription after Anthropic added OAuth validation. It installs a .pth shim that monkey‑patches the agent’s request builder, adds the required billing header, fixes prompt layout, and implements auto‑wait for subscription‑window rate limits. The installer works on Linux/macOS and Windows, provides uninstall scripts, and includes git‑hook + cron recovery to survive hermes updates.

  • Project
    RichardAtCT/claude-code-openai-wrapper

    An OpenAI‑compatible wrapper that exposes Claude Code via the standard `/v1/chat/completions` API, supporting streaming, session continuity, multi‑provider authentication, real‑time cost/token tracking, and optional tool usage.

  • Project
    raine/claude-code-proxy

    A local proxy that lets Claude Code use multiple LLM providers (Codex, Kimi, Grok, OpenCode Go, Cursor) by translating Anthropic‑style API calls, handling auth, routing, streaming and offering a TUI monitor.

  • Dispatch
    Anthropic launches Claude file provenance checker using C2PA metadata

    Anthropic’s new Claude file checker reads C2PA metadata in images, video, and audio files to reveal whether Claude generated or processed the file, a step toward AI‑generated content transparency.

  • Project
    wesammustafa/Claude-Code-Everything-You-Need-to-Know

    An interactive, version‑checked tutorial repo that teaches users how to use Anthropic’s Claude Code AI coding assistant through step‑by‑step lessons, automated checks, and three skill levels—from basic commit assistance to autonomous multi‑agent CI pipelines.