## Overview

OpenAI's original Codex API was deprecated. Current Codex workflows are tied to OpenAI's modern model stack (for example GPT-5 Codex variants) and official OpenAI infrastructure.

## Installation

```bash
npm install -g @openai/codex
```

## ModelStack Compatibility

Compatibility depends on your Codex CLI version and whether it permits custom OpenAI-compatible base URLs.

If your build supports custom base URL/env vars, configure:

- Base URL: `https://api.modelstack.cc/v1`
- API key: ModelStack API key

If not, use one of the tools with explicit OpenAI-compatible provider support (Cursor, Continue, Cline, Roo Code, Aider, Zed).

## Recommended

For guaranteed ModelStack compatibility, use [Aider](/integrations/aider) or [Continue](/integrations/continue).

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