OpenAI made GPT-5.6 Luna the default path for free ChatGPT users and updated Sol for paid users.
OpenAI said Plus and Pro users can access an updated GPT-5.6 Sol in ChatGPT starting August 6, with a slider controlling how much thought the model puts into a response. It also said GPT-5.6 Luna will become the default model for Free and Go users this week, with unlimited text chats and a Think button starting next week subject to abuse guardrails. Axios independently framed the change as a broad upgrade for free and paid users as cheaper open-weight models pressure premium AI offerings.
OpenAI's factual-error reductions, safety training and user-volume claims are company claims unless independently reproduced. Wider free access matters, but it also moves more sensitive queries, teen safeguards and usage-limit enforcement into the default consumer experience.
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