From the source
OpenAI is rolling out GPT-6 with a new Intelligent UI system across ChatGPT, reaching Plus, Pro, Business, and Enterprise users first in the Chat tab, with Free and Go following the next day.
Paid tiers use GPT-6 Sol, while Free and Go use GPT-6 Luna, both tuned for everyday conversation.
Intelligent UI allows ChatGPT to build answer formats around the task, combining prose with graphics, buttons, forms, charts, and other interactive elements.
