Free users also gain a “Think” button for deeper reasoning on complex questions. Go and Plus users already had unlimited-style access to GPT-5, image generation and file uploads, features the free tier still restricts. Connectivity, electricity and mobile data costs remain separate constraints the update doesn’t touch, meaning unlimited text chats make ChatGPT more usable without fully closing the access gap. ChatGPT Plus and Pro users can access the updated Sol model immediately. Free and Go users get GPT-5.6 Luna this week, with unlimited text chats and the Think button following next week.