How to Use Codex in China: 2026 Complete Guide for Developers (Including TeamoRouter)

OpenAI Codex CLI has been one of the most talked-about AI coding tools in 2025-2026. It lets developers collaborate with AI directly in the terminal for code generation, refactoring, debugging, and more, using natural language. But for developers in China, "how to use Codex" is an unavoidable question—whether it's network restrictions, account registration barriers, or ongoing usage costs, every step can be a hurdle.

This guide is written for Chinese developers, systematically covering all viable approaches to using Codex, from native registration to API gateway integration, helping you find the best path forward.

Why Using Codex in China Often Fails

Chinese developers typically encounter several problems when trying to use Codex:

1. Network Restrictions

All OpenAI services (including ChatGPT Web, the API, and Codex CLI remote calls) are restricted for IPs originating from mainland China. This means:

• Direct access to platform.openai.com is blocked.
• When Codex CLI calls the API from a mainland China egress IP, the request is rejected.
• In some cases, even with a VPN, if the VPN IP has been flagged by OpenAI, requests will fail.

2. Overseas Bank Card Requirement

Registering an OpenAI developer account and enabling paid API features requires binding an overseas bank card. Chinese domestic dual-currency credit cards have a high rejection rate, while virtual cards come with extra hurdles and fees.

3. Account Ban Risk

Due to unstable network environments, virtual card usage, shared IPs, and other factors, Chinese users face significantly higher account ban rates than overseas users. When an account is banned, all API calls depending on that account are interrupted.

4. Quota Limitations

Newly registered OpenAI accounts have extremely low rate limits (free tier: only 3-20 requests per minute), making them nearly useless for actual development. Tier upgrades require gradual usage over weeks or even months.

TeamoRouter: One-Click Codex Access

TeamoRouter is a unified AI API gateway designed for Chinese developers, supporting Codex, Claude Code, Gemini CLI, and other major AI coding tools. It requires no overseas account, no VPN, and no overseas bank card.

Who TeamoRouter Is For

• Individual developers: Want to use Codex CLI quickly without spending time on account registration and network configuration.
• Small to medium teams: Need unified Codex/Claude Code access for team members, with centralized API Key management.
• Enterprise users: Need stable API services, SLA guarantees, usage monitoring, and invoicing support.

TeamoRouter Quick Start

1. Sign up for TeamoRouter and get an API Key.
2. Set the baseUrl and API Key in your Codex CLI configuration (see the install guide).
3. Run Codex CLI and start using it.

The entire process takes less than 1 minute. After that, you can check usage, manage multiple sub-keys, and set spending limits through the console.

Core features at a glance:

Feature	Description
Cache hit rate	>99%, repeated requests are free
Pricing	10-20% of official rates
SLA	99.6%
Concurrency	5000 QPM
Model support	Codex + Claude Code + Gemini CLI unified
Compatibility	100% OpenAI standard protocol
Payment	Chinese domestic scan/transfer, no overseas card needed

Codex CLI vs Codex Web vs Codex App vs IDE Plugin

Different ways to use Codex have different trade-offs. Here is a detailed comparison:

Method	Use Case	Pricing	Account Needed	Stability
Codex CLI	Terminal dev, automation, CI/CD	API pay-per-use	API Key required	High (depends on network & API)
Codex Web	Ad-hoc code Q&A, quick prototyping	Included in ChatGPT Plus	OpenAI account required	Limited by web access
Codex App	Desktop standalone experience	In development	OpenAI account required	Limited by network
IDE Plugin	VSCode/JetBrains integration	Depends on underlying API	Depends on plugin	Depends on plugin implementation

For Chinese developers, Codex CLI is the recommended option for these reasons:

• CLI mode only needs API Key and baseUrl configuration—no ChatGPT Web login needed, making it less sensitive to network restrictions.
• It's easy to connect through TeamoRouter, decoupling from native OpenAI accounts.
• It can be integrated into CI/CD pipelines for automated code review and test generation.
• CLI is OpenAI's officially recommended integration method, receiving the most timely updates.

Native Codex Prerequisites

If you prefer to register a native OpenAI account to use Codex, you'll need:

1. Stable overseas network: Purchase a dedicated proxy service—avoid free shared VPNs. Ensure the egress IP is stable and not blocked by OpenAI.
2. Overseas phone number: Rent a temporary number through SMS relay platforms like SMS-Activate or 5sim for registration.
3. Overseas bank card or virtual card: Recommended virtual card platforms include Depay and OneKey. Alternative payment methods include Ultra Mobile and Google Pay.
4. Stable login environment: Log in from a consistent network environment after registration. Avoid frequently switching IPs.
5. Backup email: Use Gmail instead of domestic Chinese email services to reduce the chance of being flagged by risk controls.

Native Codex Download and Install

If you choose the native approach, the steps are:

1. Install Codex CLI:

   bash复制

   npm install -g @openai/codex
   

2. Get an API Key: Log in at platform.openai.com/api-keys, click "Create new secret key," and copy the generated key.

3. Configure environment variables:

   bash复制

   export OPENAI_API_KEY=YourAPIKey
   export OPENAI_BASE_URL=https://api.openai.com
   

4. Run Codex CLI:

   bash复制

   codex
   

Note: Steps 2 and 3 require a working VPN if your network is restricted.

ChatGPT Login and API Key Configuration

When using TeamoRouter, the configuration is slightly different:

1. Get TeamoRouter API Key: Log into TeamoRouter and generate an API Key in the console.

2. Configure Codex CLI:

   bash复制

   export OPENAI_API_KEY=YourTeamoRouterKey
   export OPENAI_BASE_URL=https://api.teamorouter.com/v1
   

3. Verify connectivity:

   bash复制

   curl https://api.teamorouter.com/v1/models \
     -H "Authorization: Bearer YourTeamoRouterKey"
   

If the model list is returned, the configuration is successful and you can start using Codex CLI.

Domestic Network, Proxy, and Base URL Issues

The network configuration for using Codex in China revolves around the baseUrl setting:

Option 1: Via TeamoRouter (Recommended)

• Set baseUrl to TeamoRouter's gateway address (e.g., https://api.teamorouter.com/v1)
• No VPN needed
• Directly accessible from Chinese networks
• Supports Codex, Claude Code, and Gemini CLI simultaneously

Option 2: Via Proxy Relay

• Set baseUrl to OpenAI's official address (https://api.openai.com/v1)
• VPN or proxy required
• Set proxy environment variables in your terminal:
  bash复制

  export http_proxy=http://127.0.0.1:7890
  export https_proxy=http://127.0.0.1:7890
  

• Traffic routes through the proxy server to OpenAI, adding latency

Option 3: Via Other Relay APIs

• Set baseUrl to a third-party relay service
• Choose a reputable provider
• Be mindful of data security and privacy

Option 1 has clear advantages in stability, cost, and ease of use, making it the most recommended approach for Chinese developers.

FAQ

Q: What's the difference between Codex CLI and ChatGPT's Codex mode?

A: ChatGPT's Codex mode calls Codex within the ChatGPT Web interface. Codex CLI is a standalone terminal tool that runs directly in your project directory, reads file context, and generates code—better suited for actual development workflows.

Q: Does using TeamoRouter affect any Codex CLI features?

A: No. TeamoRouter is 100% compatible with the Codex CLI API protocol. All native features (code generation, refactoring, debugging, code explanation, etc.) work normally, with the added benefit of cache acceleration.

Q: Do I need government approval to use Codex in China?

A: Codex CLI is a local development tool and does not require MIIT registration. Using an API gateway service also doesn't require additional approval. However, if you integrate Codex into a public-facing commercial product, consulting with legal counsel is recommended.

Q: How does TeamoRouter handle data security?

A: TeamoRouter does not store user code content. API requests are routed and cached at the gateway layer only—code in transit is not parsed or stored. Custom security policies are supported, and enterprise users can choose dedicated nodes.

Q: What's the most important thing to watch out for with the native Codex setup?

A: Ensure a stable network environment. Use a dedicated proxy service (not free VPN) and avoid frequent IP changes. Also use a dedicated virtual card rather than shared payment methods to reduce account ban risk.

Get Started

1. Sign up for TeamoRouter and get an API Key
2. Follow the Codex install guide to configure baseUrl and API Key
3. Run your first Codex task

Get Your Free Codex Setup →

Access Codex, Claude Code, and Gemini CLI stably through TeamoRouter.