OpusZen Docs

Overview

OpusZen is an ultra-low latency, Anthropic-compatible API gateway providing Claude API access without waitlists or regional limits. It works with Claude Code, Cursor, Windsurf, Cline, Roo Code, and official Anthropic SDKs — simply set your Base URL to https://api.opuszen.shop and use your API key.

Quick Start

Prerequisites

• Node.js 18+ (for NPX CLI installer or Node SDK)
• OpusZen API key (starts with sk_live_... or reseller key)
• Target tool: Claude Code, Cursor, Windsurf, VS Code, Cline, Python, or TypeScript

1. Interactive Setup (Recommended)

Run the official interactive CLI wizard — it configures your editor, tests connectivity, and sets models:

npx opuszen

2. One-Line Platform Installers

Fast automated setup for macOS, Linux, or Windows terminals:

irm https://api.opuszen.shop/setup.ps1 | iex

curl -fsSL https://api.opuszen.shop/setup.sh | bash

3. Manual Environment Configuration

Export these environment variables in your terminal or ~/.bashrc / ~/.zshrc:

export ANTHROPIC_BASE_URL="https://api.opuszen.shop"
export ANTHROPIC_API_KEY="YOUR_API_KEY"

IDE Configuration

{
  "env": {
    "ANTHROPIC_AUTH_TOKEN": "YOUR_API_KEY",
    "ANTHROPIC_BASE_URL": "https://api.opuszen.shop",
    "ANTHROPIC_MODEL": "Opus 4.8",
    "ANTHROPIC_SMALL_FAST_MODEL": "Haiku 4.5",
    "ANTHROPIC_DEFAULT_SONNET_MODEL": "Sonnet 4.6",
    "ANTHROPIC_DEFAULT_OPUS_MODEL": "Opus 4.8",
    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "Haiku 4.5",
    "CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC": "1"
  },
  "hasCompletedOnboarding": true
}

https://api.opuszen.shop/v1

{
  "cline.apiProvider": "anthropic",
  "cline.anthropicBaseUrl": "https://api.opuszen.shop/v1",
  "cline.apiKey": "YOUR_API_KEY",
  "cline.anthropicModelId": "claude-opus-4-8"
}

SDKs & Code Examples

OpusZen is a drop-in replacement for the official Anthropic API. Switch tabs to see code examples in Python, TypeScript, raw cURL, SSE streaming, and the OpenAI SDK.

import anthropic

# Initialize the client pointing to OpusZen
client = anthropic.Anthropic(
    api_key="YOUR_API_KEY",
    base_url="https://api.opuszen.shop",
)

message = client.messages.create(
    model="claude-opus-4-8",
    max_tokens=1024,
    messages=[
        {"role": "user", "content": "Explain quantum computing in one paragraph."}
    ],
)

print(message.content[0].text)

API Reference

x-api-key: YOUR_API_KEY

Authorization: Bearer YOUR_API_KEY

Gateway Endpoints

{
  "model": "claude-opus-4-8",
  "max_tokens": 1024,
  "messages": [
    { "role": "user", "content": "Hello, Claude!" }
  ],
  "stream": false
}

{
  "id": "msg_01XyZ890OpusZenLive",
  "type": "message",
  "role": "assistant",
  "model": "claude-opus-4-8",
  "content": [
    {
      "type": "text",
      "text": "Hello! How can I assist you with your projects today?"
    }
  ],
  "stop_reason": "end_turn",
  "usage": {
    "input_tokens": 12,
    "output_tokens": 14
  }
}

{
  "data": [
    {
      "id": "claude-opus-4-8",
      "display_name": "Claude Opus 4.8",
      "context_window": 1000000,
      "type": "model"
    },
    {
      "id": "claude-sonnet-4-6",
      "display_name": "Claude Sonnet 4.6",
      "context_window": 1000000,
      "type": "model"
    }
  ]
}

{
  "model": "claude-opus-4-8",
  "messages": [
    { "role": "user", "content": "How many tokens is this sentence?" }
  ]
}

{
  "valid": true,
  "status": "active",
  "plan": "Pro Developer",
  "name": "Production Opus Key",
  "balance": 250.00,
  "usage": {
    "tokens_used": 154200,
    "limit": 5000000,
    "reset_in_seconds": 1800
  }
}

Error Codes & Status

Standard HTTP response status codes returned by the gateway:

Available Models

All models are Anthropic-compatible and work with standard Anthropic or OpenAI SDK calls. Click any Model ID to copy it to your clipboard.

Built-in Tools

Web search and image analysis are available directly on the server — no client-side MCP configuration or extra API keys required.

POST https://api.opuszen.shop/tools/web_search

{ "query": "latest Anthropic Claude 4.8 release notes" }

POST https://api.opuszen.shop/tools/understand_image

{ "image": "https://example.com/screenshot.png", "prompt": "Describe this UI screenshot" }

Troubleshooting & FAQ