ChatGPT Update: Reasoning Slider, Free GPT-5.6 Luna

OpenAI is updating ChatGPT to improve everyday conversations and broaden access for free users. Plus and Pro subscribers now have a new slider to control how much reasoning effort the model applies to each response. What's interesting is that free-tier users are getting GPT-5.6 Luna as their new default model, along with unlimited text conversations. They also get a "Think" button for deeper reasoning on complex questions. OpenAI says the updates aim for more reliable factual answers and tighter responses. In testing, factual errors dropped by about 62% with GPT-5.6 Luna and 68% with GPT-5.6 Sol, compared to the previous model. The bottom line is that these changes mean a more consistent and accurate experience for many users.