Codex - CC GUI

Codex uses Codex CLI / app-server capabilities. Config is usually written to ~/.codex/. You can also authorize reading files you already have locally.

How to connect

Open Settings → CLI configuration → Codex CLI:

Add a Codex provider (config.toml + auth.json). Saving writes ~/.codex/
Or use existing local ~/.codex/config.toml and auth.json
For a subscription account, run codex login in a terminal first
If codex is not installed, click Install on that page
You can override the Codex CLI path

Install

npm install -g @openai/codex

For a subscription account, also run codex login. Docs: Codex CLI

Custom models

You can add a model ID, display name, and context window, plus message / MCP environment variables.

Differences from Claude

Capability	Codex
Plan mode	Shown as collaboration / sandbox modes; not the same as Claude plan
Skills	Supports `$`-style skills
Rewind / fork	Available when the runtime supports it
Fast / collaboration options	Visible in the input or Settings

Usage stats

Cost estimates are accurate only after you add a unit price for the model. The monthly budget threshold is a local visual reminder. It does not stop the runtime.

Next steps