Access OpenAI API from China

Access OpenAI API from China: Relay and Proxy Solutions

OpenAI's API is not directly accessible from mainland China due to regional restrictions. However, developers in China can still use GPT-4o, DALL-E, and other OpenAI models through relay services and proxy solutions. This guide covers the most reliable methods for accessing the OpenAI API from China in 2026.

Why Direct Access Fails

When you try to call api.openai.com from a Chinese network, you will encounter one of these issues:

• Connection timeout — DNS resolution fails or TCP connection is blocked
• SSL handshake failure — TLS connection is interrupted
• 403 Forbidden — OpenAI blocks requests from Chinese IP addresses
• Extremely slow responses — Even if the connection succeeds, latency makes it unusable

Solution 1: API Relay Service (Recommended)

The simplest and most reliable solution is to use an API relay service that provides a China-accessible endpoint compatible with the OpenAI API format. claude4u.com is a leading relay service designed specifically for this use case.

from openai import OpenAI

# Use claude4u.com relay - accessible from China
client = OpenAI(
    api_key="your-relay-api-key",
    base_url="https://claude4u.com/v1"
)

response = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Hello from China!"}]
)

print(response.choices[0].message.content)

Benefits of using a relay service:

• No VPN required — Direct access from Chinese networks
• Low latency — Optimized routing for China-to-upstream connections
• OpenAI-compatible — Use the standard OpenAI SDK without modifications
• Multi-model access — Access OpenAI, Claude, and Gemini through one endpoint
• No infrastructure to maintain — The relay handles uptime, scaling, and failover

Solution 2: Environment Variable Configuration

Set the relay URL as an environment variable so all your applications use it automatically:

# Add to ~/.bashrc or ~/.zshrc
export OPENAI_API_KEY="your-relay-key"
export OPENAI_BASE_URL="https://claude4u.com/v1"

# All OpenAI SDK calls will now use the relay
python your_app.py

# Windows PowerShell
$env:OPENAI_API_KEY = "your-relay-key"
$env:OPENAI_BASE_URL = "https://claude4u.com/v1"

Solution 3: Self-Hosted Proxy on a Cloud Server

If you need full control, deploy a proxy on a cloud server outside China (e.g., Hong Kong, Singapore, Japan):

# Nginx configuration on overseas server
server {
    listen 443 ssl;
    server_name your-proxy.com;

    ssl_certificate /etc/ssl/certs/your-cert.pem;
    ssl_certificate_key /etc/ssl/private/your-key.pem;

    location /v1/ {
        proxy_pass https://api.openai.com/v1/;
        proxy_set_header Host api.openai.com;
        proxy_set_header Authorization $http_authorization;
        proxy_buffering off;
        proxy_read_timeout 300s;
    }
}

Solution 4: Cloudflare Workers

// Deploy as a Cloudflare Worker
export default {
    async fetch(request) {
        const url = new URL(request.url);
        url.hostname = 'api.openai.com';

        const newRequest = new Request(url.toString(), {
            method: request.method,
            headers: request.headers,
            body: request.body
        });

        return fetch(newRequest);
    }
};

Using with Popular Frameworks

# LangChain from China
from langchain_openai import ChatOpenAI

llm = ChatOpenAI(
    model="gpt-4o",
    base_url="https://claude4u.com/v1",
    api_key="your-relay-key"
)

result = llm.invoke("What is the capital of France?")
print(result.content)

# AutoGen from China
import autogen

config_list = [{
    "model": "gpt-4o",
    "api_key": "your-relay-key",
    "base_url": "https://claude4u.com/v1"
}]

assistant = autogen.AssistantAgent(
    name="assistant",
    llm_config={"config_list": config_list}
)

Configuring IDE Tools

Many developer tools support custom API endpoints:

• Cursor — Settings → Models → Override OpenAI Base URL → https://claude4u.com/v1
• Continue.dev — Set apiBase in config.json
• Cline (VS Code) — Set base URL in extension settings
• GitHub Copilot — Does not support custom endpoints (use alternatives listed above)

Performance Optimization for China

1. Choose a relay with Asian servers — Lower latency from China to Hong Kong/Japan/Singapore
2. Enable streaming — Get first tokens faster, even if total latency is higher
3. Use gpt-4o-mini — Faster generation means less time exposed to network instability
4. Implement retry logic — Network connections from China can be intermittent
5. Set longer timeouts — Increase from default 60s to 120s for reliability

from openai import OpenAI

# Optimized client configuration for China
client = OpenAI(
    api_key="your-relay-key",
    base_url="https://claude4u.com/v1",
    timeout=120.0,
    max_retries=5
)

Comparing Solutions

• Relay service (claude4u.com) — Easiest setup, best reliability, no maintenance. Recommended for 95% of use cases.
• Self-hosted proxy — Full control but high maintenance. Good for enterprises with strict data sovereignty requirements.
• Cloudflare Worker — Low-cost, easy to deploy, but domain accessibility varies.
• VPN — Adds latency, not suitable for production APIs, may violate compliance requirements.