ChatGPT has rolled out significant updates to its AI models, enhancing user experience for both free and paid subscribers. For Plus and Pro users, the GPT-5.6 Sol model in ChatGPT has been refined for greater factual accuracy and more focused responses. A new slider allows users to control the level of computational thought applied to each query, enabling quicker answers for simple questions and deeper analysis for complex tasks. Free users will now benefit from unlimited everyday text chats powered by GPT-5.6 Luna, the updated default model. They also gain access to a new 'Think' button for more demanding questions, providing enhanced reasoning capabilities.

These improvements aim to make ChatGPT more reliable and useful for its 1 billion weekly users. GPT-5.6 Sol is now better at handling factual queries, showing a substantial reduction in errors compared to previous versions. The updates also ensure a more consistent tone and behavior across different interaction types, whether users opt for instant responses or deeper thinking. For free users, unlimited text chats mean they can engage in longer, more productive conversations without interruption, with the 'Think' button offering a way to access more advanced processing when needed, subject to abuse guardrails.

OpenAI emphasizes its mission to make artificial general intelligence beneficial for everyone. This expansion of access and model capability for free users is a step towards democratizing advanced AI tools. While limits on file uploads, images, and other tools remain, the core text-based interactions are now more robust and accessible. Specific safety training and evaluations have also been implemented, particularly for users believed to be under 18, with reinforced boundaries around sensitive topics and encouragement for users to seek support from trusted individuals.