OpenAI has announced a significant update for ChatGPT, removing text chat limits for free users and introducing a new default model, GPT-5.6 Luna, along with a Think button for complex questions. The changes also include an upgraded GPT-5.6 Sol for Plus and Pro subscribers, rolling out next week.
Unlimited Text Chats for Free and Go Users
The most notable change is the removal of message caps for text conversations on the free tier. Users can now chat without interruption throughout the day. However, this unlimited access applies only to text chats; file uploads, image uploads, voice conversations, and AI image generation still have separate usage limits. This is especially beneficial for users who rely on ChatGPT for writing, brainstorming, learning, or asking questions.
GPT-5.6 Luna: Default Model for Free and Go
Free and Go users will automatically get GPT-5.6 Luna as the default AI model, replacing GPT-5.5. According to OpenAI, GPT-5.6 Luna produces 62% fewer factual errors than its predecessor while maintaining a natural and fast conversational experience. It handles routine tasks like answering straightforward questions, explaining concepts, and helping with writing.
Think Button for Deeper Reasoning
A new Think button will be available for free and Go users. When selected, ChatGPT takes additional time to reason through multi-step problems, complex concepts, or questions requiring detailed analysis before providing an answer. Users can activate it whenever they need more thoughtful responses.
Upgraded GPT-5.6 Sol for Plus and Pro Subscribers
Plus and Pro users receive an upgraded version of GPT-5.6 Sol, which improves performance for daily productivity tasks like answering questions, web research, project planning, content writing, advice, and decision-making. The model aims to produce more concise and unambiguous responses without sacrificing accuracy. OpenAI reports that GPT-5.6 Sol makes 68% fewer factual mistakes than GPT-5.5 Instant. These subscribers also gain a thinking slider to control the level of reasoning before responses—lower for simple queries, higher for complex requests.
Rollout Timeline
GPT-5.6 Sol is already available to Plus and Pro users. The remaining updates for free and Go users will begin rolling out next week.