OpenAI Codex
Codex on ChatGPT Free: quick coding tasks with GPT-6 Luna in the desktop app.
AI Coding
What you get
OpenAI's Codex coding agent on the ChatGPT Free plan for quick coding tasks, using GPT-6 Luna at Standard speed in the desktop app.
How to get it
Sign in to the ChatGPT desktop app with a free ChatGPT account.
What it requires
A free ChatGPT account.
The catch
Free usage limits aren't published and access is subject to rollout; Codex on the web, in the CLI and IDE extension and on iOS starts with Plus ($20/month).
From the official page · checked Oct 26, 2026