On August 6 (local time), OpenAI announced an update to the ChatGPT model, enhancing the performance of GPT-5.6 Sol in terms of factual accuracy, answer focus, and multi-scenario consistency. Plus and Pro users will utilize the updated GPT-5.6 Sol, which adjusts the depth of answers based on question complexity and reduces redundant content. Meanwhile, OpenAI has expanded access to GPT-5.6 Luna for free users, offering unlimited text chat functionality. For complex questions, free users can invoke higher reasoning capabilities through the newly added 'Think' button.