OpenAI Codex Access Guide

Now you can use models like gpt-5.1-codex via the UModelverse Platform .

🚀 Quick Start

1. Installation

1. Please ensure you have npm installed. Refer to the Node.js official website .

2. Install OpenAI Codex:

npm install -g @openai/codex@latest

2. Configuration

2.1 Configure the Model Provider

Create and configure your ~/.codex/config.toml file in a Mac or Linux environment:

model_provider = "ucloud"
model_reasoning_effort = "high"
model = "gpt-5.1-codex"
 
[model_providers.ucloud]
name = "ucloud"
base_url = "https://api.umodelverse.ai/v1"
wire_api = "responses"
requires_openai_auth = true

2.2 Configure the API Key

Create and configure your ~/.codex/auth.json file:

{
  "OPENAI_API_KEY": "your-umodelverse-api-key"
}

Note: Please replace your-umodelverse-api-key with the actual API Key you obtained from the UModelverse platform.

3. Use Codex

Once configured, you can run Codex directly in the terminal:

codex

You can switch models via /model, as shown in the image: You can also directly install the codex VS Code extension after configuring and use it by switching the model and reasoning effort.