OpenCode Anthropic Proxy

A local proxy server that wraps claude -p (Claude Code CLI) to expose an OpenAI-compatible API for use with OpenCode.

Overview

This proxy allows OpenCode to use Anthropic models by bridging OpenCode's OpenAI-compatible API calls to the claude -p CLI, which is the officially supported method for third-party integrations per Anthropic's terms of use.

Files

• claude-proxy.mjs — The proxy server (Node.js, no external deps)
• claude-proxy.service — systemd user service for automatic startup

Setup

1. Copy claude-proxy.mjs to ~/.config/opencode/claude-proxy.mjs
2. Copy claude-proxy.service to ~/.config/systemd/user/claude-proxy.service
3. Enable and start the service:

   systemctl --user daemon-reload
   systemctl --user enable --now claude-proxy
   

OpenCode Configuration

In your opencode.json, add the claude-code provider:

"claude-code": {
  "npm": "@ai-sdk/openai-compatible",
  "name": "Claude Code (proxy)",
  "options": {
    "baseURL": "http://localhost:3000/v1"
  },
  "models": {
    "claude-opus-4-7": { "name": "Claude Opus 4.7" },
    "claude-sonnet-4-6": { "name": "Claude Sonnet 4.6" },
    "claude-haiku-4-5": { "name": "Claude Haiku 4.5" }
  }
}

Requirements

• Claude Code CLI installed at ~/.local/bin/claude
• Node.js 18+