ChatGPT is rolling out significant updates to its GPT models, enhancing user experience for both free and paid tiers. For Plus and Pro users, GPT‑5.6 Sol in ChatGPT has been refined for greater factual accuracy and more focused responses. A new slider allows users to control the model's "thought" process, adjusting the depth of reasoning for each query. This aims to provide direct answers for quick questions and more comprehensive responses for complex tasks like planning or research.

Free users will benefit from GPT‑5.6 Luna becoming the default model, offering unlimited text chats. A new "Think" button will provide access to higher reasoning for more challenging questions, allowing the model more time to process complex queries. This expansion aims to democratize access to advanced AI capabilities, enabling more people to utilize ChatGPT for a wider range of tasks without usage limits.

These updates focus on improving reliability, especially with factual information, with GPT‑5.6 Luna and Sol showing a significant reduction in factual errors compared to GPT‑5.5 Instant. The goal is to provide more intelligent and accessible AI for a broader user base, fostering greater opportunity through advanced technology. Safety measures, particularly for users under 18, have also been reinforced.