ChatGPT Free: Unlimited AI Chats & 'Think' Mode with GPT-5.6

OpenAI is significantly upgrading the free version of ChatGPT. Free users will soon have unlimited text conversations powered by the new GPT-5.6 Luna model. This update brings more advanced AI capabilities to millions without a paid subscription. The "Think" button is also returning. This feature allows ChatGPT more time to process complex questions before responding. OpenAI CEO Sam Altman confirmed this change. GPT-5.6 Luna replaces GPT-5.5 for free users. This means no more limits on everyday text chats. However, restrictions remain for features like image generation and file uploads. The "Think" button, when enabled, helps with research, planning, and calculations. OpenAI states that GPT-5.6 Luna offers improved factual reliability. Internal evaluations show responses with factual errors are 62% less common compared to the previous GPT-5.5 Instant. The GPT-5.6 Sol update is already rolling out for Plus and Pro subscribers. Free and Go users will see GPT-5.6 Luna as the default model this week, with unlimited text conversations and the "Think" button arriving next week. This makes advanced AI more accessible to a wider audience.