GPT-6 Sol and GPT-6 Luna roll out to Codex

What changed

GPT-6 Sol is aimed at complex coding and agentic work, and GPT-6 Luna at focused, high-volume tasks. Both rolled out to Plus, Pro, Business, Enterprise and Edu; Free and Go get Luna in the desktop app. Enterprise admins have to enable the models, and in ChatGPT they appear in Work and Codex but not in Chat.

Who it affects

Plus, Pro, Business, Enterprise and Edu users (both models); Free and Go (Luna in the desktop app).

What to do

Pick the model in the model picker, or run codex --model gpt-6-sol or codex --model gpt-6-luna in the CLI.

Source: https://learn.chatgpt.com/docs/changelog#codex-2026-09-22-gpt-6-sol-luna