Codex · your ChatGPT plan
GPT-6 Luna
Answers almost as you press Enter
Codex runs the Assistant on GPT-6 Luna, the smallest and quickest of OpenAI’s GPT-6 models. That suits orchestration, where most turns are a runbook search, a tool call and a short reply.
- Signs in with your ChatGPT account or an OpenAI API key
- Uses your plan’s normal Codex allowance, very lightly
- Astra or Sol when you want more depth, in Settings