On August 7, 2026, OpenAI announced an update to the ChatGPT experience. On the paid side, the GPT-5.6 Sol model used by Plus and Pro users has been re-tuned for higher factual accuracy and more focused responses, with the addition of a slider function to control the "depth of thought." On the free side, the default model has been switched to GPT-5.6 Luna, with unlimited text conversations and a new Think button to handle questions requiring more reasoning.