GPT-5.6 Luna for free users
Improved GPT-5.6 Sol in ChatGPT; free users get unlimited everyday chats with GPT-5.6 Luna.
ChatGPT introduces improved GPT-5.6 Sol with better accuracy and consistency, plus expanded access for free users and unlimited everyday chats with GPT-5.6 Luna.
Official source
Improving GPT‑5.6 Sol in ChatGPT—and expanding access to GPT-5.6 Luna for free usersopenai.com · published