OpenAI has rolled out upgrades across ChatGPT's paid and free tiers. Per OpenAI's official announcement, the GPT-5.6 Sol model used by Plus and Pro subscribers now shows 68% fewer factual errors in the company's high-standard factuality evaluation, with answers formatted more concisely. A new reasoning slider has also been added to web, mobile and desktop, letting users control how much processing each reply receives: everyday questions can stay fast, while heavier tasks such as planning, research, writing or coding benefit from a higher slider setting. On the free side, the default model is now the smaller GPT-5.6 Luna, and unlimited text conversations have been enabled. A new Think button offers elevated reasoning for difficult questions. The shift signals OpenAI pushing stronger intelligence into the free layer, though some commenters note that free users are being steered toward the less capable Luna model.
OpenAI has upgraded ChatGPT's paid and free experiences in a single move. Based on the company's official announcement, the GPT-5.6 Sol model used by Plus and Pro subscribers now produces 68% fewer factual errors in OpenAI's high-standard factuality evaluation, while responses come out more focused and tightly formatted. A newly added slider also lets users set the level of "reasoning effort" for each answer.
Paid tier: a sharper Sol, plus a reasoning slider
For Plus and Pro users, the updated GPT-5.6 Sol records 68% fewer factual mistakes under OpenAI's strict factuality benchmarks, and its answers are more concise. OpenAI has added a slider to the web, mobile and desktop clients, giving users direct control over how much "thinking" goes into each response. Everyday questions can stay quick, while tasks involving planning, research, writing or coding can turn the slider up for deeper reasoning.
Free tier: Luna as the default, unlimited text chats
For free users, ChatGPT's default model has switched to GPT-5.6 Luna, a smaller variant, and unlimited text conversations are now open. When a question is genuinely hard, a new Think button can trigger a higher level of reasoning from the model.
This effectively extends better intelligence down to the free layer, although some commentary points out that free users are being directed toward the less capable Luna model.
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