OpenAI today said it is making GPT-5.6 Luna the default model for Free and Go ChatGPT users, giving them access to a newer, more capable model to replace GPT-5.5 Instant. The company is letting Free and Go users access unlimited text chats, with no text-based rate limits. Limits will still apply for file uploads, images, and other ChatGPT tools. There's also a new Think button coming that turns on higher reasoning.
