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.
Verified 2:15 PM PDT · 2 original sources
The evidence
What the reporting establishes
What happened
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.
Pressure point
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.
What to watch
Whether the rollout reaches free users on schedule, how the unlimited-text guardrails behave, independent comparisons of Luna and Sol on factual tasks, and whether cheaper defaults change paid conversion or API demand.
Audit the story
Original sources
Company claims remain company claims. Follow the reporting and judge the evidence directly.
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