Codex CLI works offline for coding help in China

Codex CLI lets you code without sending all your code to the cloud. This is great for users in places like China who have internet issues.
By Newsroom | Technology, Software Development |

OpenAI's Codex, a local command-line interface coding agent, presents a multifaceted approach to integration. The agent operates directly on a user's machine, sending only prompts and essential context to the model, thus sidestepping direct code uploads to the cloud. Installation routes vary, including package managers like npm and Homebrew, or direct download from GitHub releases. The CLI requires Node.js version 22 or later.

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Deployment and Accessibility

Codex offers a desktop application for macOS and Windows, alongside IDE integrations for environments like VS Code and Cursor. The CLI component, distributed as an npm package, is central to local operations. For users in regions facing connectivity challenges, redirecting the CLI's base URL to OpenAI-compatible gateways, such as those offered by ofox.ai, is presented as a viable workaround. This redirection bypasses direct OpenAI domain access, which can be hampered by network restrictions.

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Key Configurations and Access

Successful implementation often hinges on proper configuration, particularly the base_url and wire_api settings within the ~/.codex/config.toml file. For users accessing services via ofox.ai, the model is specified as openai/gpt-5.3-codex, with model_provider set to ofoxai and the base_url pointing to https://api.ofox.ai/v1. The environment variable OFOXAI_API_KEY must be set with the provided API key. The wire_api should be configured as "responses", as "chat" is deprecated.

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Functionality and User Experience

Codex is designed to assist with a range of coding tasks, from writing code and prototyping to documentation and code review. Automations allow for unprompted background work, including issue triage and alert monitoring. The desktop app serves as a command center for agentic coding, supporting multi-agent workflows and offering features like worktree support and Git integration.

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Installation Pathways

Users can install the Codex CLI via npm: npm install -g @openai/codex. On macOS, Homebrew provides an alternative: brew install --cask codex. Windows users can opt for the npm installation or download the desktop app from the Microsoft Store. For Linux systems, installation typically involves downloading a binary archive from GitHub Releases and executing it.

Subscription Requirements

Access to most Codex features, including the desktop app and CLI, is included with ChatGPT Plus, Pro, Business, Edu, and Enterprise subscriptions. Direct login using a ChatGPT account is facilitated for users with these subscriptions, eliminating the need for separate API key management in many cases.

Background:

Codex is framed as a tool to enhance team productivity through more thorough design, comprehensive testing, and efficient code review. It aims to adapt to existing team workflows by offering capabilities beyond simple code generation, extending into code understanding and prototyping. The agent's design emphasizes continuous operation, allowing it to handle routine tasks independently. Discussions around its deployment often touch upon navigating network restrictions, particularly for users within mainland China, where direct access to OpenAI services can be inconsistent. Alternative providers and configurations are explored to ensure accessibility and functionality.

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Frequently Asked Questions

Q: How does Codex CLI help people coding in China?
Codex CLI works on your own computer, sending only your instructions (prompts) to the AI. This means you don't have to send all your code to the cloud, which is helpful if internet access is difficult or blocked.
Q: How can I install the Codex CLI?
You can install it using npm with the command `npm install -g @openai/codex`. Mac users can also use Homebrew with `brew install --cask codex`. Windows users can use npm or download the desktop app. Linux users can download it from GitHub.
Q: What if I can't connect directly to OpenAI?
If you have trouble connecting directly to OpenAI, you can change the Codex CLI settings to use a different gateway, like ofox.ai. This lets the tool work even with network restrictions.
Q: What do I need to use Codex CLI?
You need Node.js version 22 or later. Most features are included if you have a ChatGPT Plus, Pro, Business, Edu, or Enterprise subscription. You can log in with your ChatGPT account.
Q: What can Codex CLI do for coders?
Codex CLI can help write code, create new ideas, write notes about code, and check code for mistakes. It can also do tasks automatically in the background, like checking for problems or watching for alerts.
Q: How do I set up Codex CLI to work with a different gateway like ofox.ai?
You need to edit the config file `~/.codex/config.toml`. Set `model_provider` to `ofoxai`, `model` to `openai/gpt-5.3-codex`, and `base_url` to `https://api.ofox.ai/v1`. You also need to set the `OFOXAI_API_KEY` environment variable.