Codex Setup Guide

Install Codex CLI

Use the same npm command on Windows, macOS, and Linux:

npm install -g @openai/codex

Verify:

codex --version

If a version number is printed, installation succeeded.

Configure API

Codex requires the OpenAI-compatible URL to end with /v1.

Config File Locations

System	config.toml	auth.json
Windows	C:\Users\Username\.codex\config.toml	C:\Users\Username\.codex\auth.json
macOS / Linux	~/.codex/config.toml	~/.codex/auth.json

config.toml

model_provider = "mioufun"
model = "your-model-name"
model_reasoning_effort = "high"
disable_response_storage = true

[model_providers.mioufun]
name = "MiouFun"
base_url = "https://api.mioufun.top/v1"
wire_api = "responses"
requires_openai_auth = true
model_context_window = 1000000
model_auto_compact_token_limit = 900000

auth.json

{
  "OPENAI_API_KEY": "sk-***"
}

Start Using

Enter your project directory and start:

cd your-project-directory
codex

After the input box appears, describe what you want to do.

Tip

If you are unsure about the model name, check the model list in the MiouFun API console or test with the default model name provided by the portal.