Codex - Alibaba Cloud Model Studio - Alibaba Cloud Documentation Center

Set up and use Coding Plan with Codex.

Scope

Applies to older versions of Codex that support the Chat/Completions API, such as version 0.80.0. Newer versions of Codex use the Responses API and do not yet support the Coding Plan.

Install Codex

Install or update Node.js (v18.0 or later).
Install Codex.
Note
The latest version of Codex does not support the Chat/Completions API. Install a compatible older version to use the Coding Plan.
```
npm install -g @openai/codex@0.80.0
```
Verify the installation.
```
codex --version
```

Set up Coding Plan in Codex

Update the config file
Add the following to your Codex config file at ~/.codex/config.toml. For the model parameter, select a supported model.
Note
The latest version of Codex does not support the Chat/Completions API. To use the Coding Plan, you must install a compatible version. See the Install Codex section.
```
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

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

Set the environment variable in CMD.

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

Set the environment variable in PowerShell.

# Replace YOUR_API_KEY with your dedicated 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.

FAQ

What do I do if I get the error "wire_api = chat is no longer supported"?

Cause: Newer versions of Codex use the Responses API and do not support the wire_api = "chat" setting or the Coding Plan.

Solution: Downgrade to a compatible version:

npm install -g @openai/codex@0.80.0

What do I do if I get the error "unexpected status 404 Not Found: Unknown error, url: https://coding.dashscope.aliyuncs.com/v1/responses"

Cause: The wire_api parameter in the config file is incorrectly set to responses. Codex does not support connecting to Coding Plan through the Responses API.

Solution: Set wire_api to chat.

wire_api = "chat"