Codex - Alibaba Cloud Model Studio - Alibaba Cloud Documentation Center

Codex is an intelligent coding agent developed by OpenAI. Set up and use Alibaba Cloud Model Studio's Coding Plan with Codex.

Note

The latest version of Codex no longer supports the Chat or Completions API. To use the Coding Plan, follow the instructions below to install and use an earlier version.

Install Codex

Install or update Node.js (v18.0 or later).
Run the following command in your terminal to install an older version of Codex that supports the Chat and Completions APIs, such as version 0.80.0.
```
npm install -g @openai/codex@0.80.0
```
Verify the installation. If a version number is returned, the installation is successful.
```
codex --version
```

Configure Codex

Update the config file
Copy the following code block and paste it into your Codex config file: ~/.codex/config.toml. Select a supported model from the list.
Note
The latest version of Codex no longer supports the Chat or Completions API. To use the Coding Plan, follow the instructions above to install an earlier version of Codex.
```
model_provider = "Model_Studio_Coding_Plan"
model = "qwen3.5-plus"
[model_providers.Model_Studio_Coding_Plan]
name = "Model_Studio_Coding_Plan"
base_url = "https://coding-intl.dashscope.aliyuncs.com/v1"
env_key = "OPENAI_API_KEY"
wire_api = "chat"
```

Set the environment variable

Set the OPENAI_API_KEY environment variable to your Coding Plan API Key.

macOS

Run the following command in your terminal to check your default shell.
```
echo $SHELL
```

Set the environment variable based on your shell type.

Zsh

# Replace YOUR_API_KEY with your Coding Plan API key
echo 'export OPENAI_API_KEY="YOUR_API_KEY"' >> ~/.zshrc

Bash

# Replace YOUR_API_KEY with your Coding Plan API key
echo 'export OPENAI_API_KEY="YOUR_API_KEY"' >> ~/.bash_profile

Apply the environment variable.
Zsh
```
source ~/.zshrc
```
Bash
```
source ~/.bash_profile
```

Windows

CMD

Run the following command in CMD to set the environment variable.

REM Replace YOUR_API_KEY with your Coding Plan API key
setx OPENAI_API_KEY "YOUR_API_KEY"

Open a new CMD window and verify the environment variable.
```
echo %OPENAI_API_KEY%
```

PowerShell

Run the following command in PowerShell to set the environment variable.

# Replace YOUR_API_KEY with your Coding Plan API key
[Environment]::SetEnvironmentVariable("OPENAI_API_KEY", "YOUR_API_KEY", [EnvironmentVariableTarget]::User)

Open a new PowerShell window and verify the environment variable.
```
echo $env:OPENAI_API_KEY
```

Use Codex

Open a new terminal and start Codex.
```
codex
```
Skip the update prompt.
Start a conversation.