OpenAI Unveils Unlimited Text Chats for All Users, New GPT Models

The company has announced that it will remove limits on text-based chats for all users on ChatGPT, introducing a new GPT-5.6 Luna model and a 'Think' button for complex questions.

ChatGPT, which recently crossed the 1 billion weekly user mark, will now offer unlimited text chats for all users. The new GPT-5.6 Luna model will power this experience and will be the default model for Free and Go users, replacing GPT-5.5. Both users will also get a new 'Think' button that lets them select higher reasoning power for complex questions.

The update brings changes for Plus and Pro users as well. They'll gain access to an upgraded GPT-5.6 Sol model that's better for quick tasks such as questions, web research, advice, planning, writing, and making decisions.

• The company noted that this new model will give more compact and robust answers.
• ChatGPT Plus and Pro users are also getting a thinking slider to adjust 'how much' thought the model puts into an answer.

Internal Evaluation Reveals Improved Accuracy

An internal evaluation found that, compared to GPT-5.5-Instant, factual errors were 62% less common for GPT-5.6 Luna and 68% less common for GPT-5.6 Sol.

New Features Arrive This Week and Next

The updated version of GPT-5.6 Sol is available to Plus and Pro users today, while the other changes for Free and Go users are arriving this week. Next week, users will gain access to unlimited text chats and the new Think button for harder questions.