OpenAI has made changes to its GPT-5.6 Sol model, enhancing its ability to provide more focused responses and introducing a feature that allows users to adjust the model's reasoning depth. However, free users will now be restricted to the smaller GPT-5.6 Luna model, which still lags behind its more advanced counterparts. The updated model and access restrictions are set to take effect next week. This development may impact the user experience for those relying on ChatGPT, particularly free users who may see limitations in the model's capabilities.