OpenAI is rolling out a more reliable version of ChatGPT GPT-5.6 Sol for Plus and Pro users, while Free users are getting unlimited text chats with GPT-5.6 Luna.
The changes are focused on making ChatGPT more direct, factually accurate, and consistent across quick questions and deeper reasoning tasks.
In our tests, BleepingComputer observed that GPT now gives you greater control over the model's reasoning and intelligence with a new slider.
ChatGPT's intelligence sliderSource: BleepingComputer
As you can see in the screenshot, you can slide GPT's reasoning from Instant to High. Instant would respond almost immediately, while High reasoning could take several minutes.
You can keep the slider low for everyday questions or increase the reasoning effort for tasks such as research, coding, writing, planning, and complex decisions.
GPT-5.6 Sol is getting more focused and reliable answers
OpenAI says the updated GPT-5.6 Sol has been tuned specifically for how people use ChatGPT, rather than for the longer-running agentic workflows found in Codex and ChatGPT Work.
"It delivers more focused answers, adapts its level of detail to the question, avoids unnecessary formatting, and offers a helpful correction when simply agreeing wouldn't be useful," OpenAI said.
For example, if you ask simple questions, GPT should answer directly without adding unnecessary background. For more complicated work, it should provide enough detail while keeping the main recommendation easy to identify.
A question like "Who is the president of the United States?" will have a single-line answer, but a question like "How are elections held in the US?" will have a longer answer with background information.
OpenAI also claims that GPT-5.6 Sol is less likely to make factual mistakes when handling dates, numbers, sources, legal rules, medical information, financial questions, or assumptions.
In internal tests, OpenAI found that responses containing at least one factual error were 68% less common with GPT-5.6 Sol than with GPT-5.5 Instant.
Moreover, GPT-5.6 Luna reduced such responses by 62% in the same evaluation.
Free users are getting unlimited GPT-5.6 Luna chats
GPT-5.6 Luna will become the default model for Free and Go users this week, and some users are already seeing the change. I spotted it in my OpenAI account with a Go subscription that costs approximately $10.
Smarter ChatGPTSource: OpenAI
Starting next week, OpenAI also plans to remove the rate limit for text chats on those plans, although usage will remain subject to abuse protections. However, limits will still apply to file uploads, image generation, and other ChatGPT tools.
With a free account, you will still receive a new Think button that gives GPT-5.6 Luna additional time to reason through harder questions.
"For questions that require deeper reasoning, Free users can tap the new Think button to give GPT-5.6 Luna more time to work through the answer," OpenAI noted.
The update does not affect GPT-5.6 Sol in Codex or Work
The revised version of GPT-5.6 Sol is designed for everyday conversations and will only be available through ChatGPT's regular Chat experience.
OpenAI is also introducing additional protections for users believed to be under 18.
These include stricter boundaries around romantic roleplay, sexual content, dangerous activities, eating disorders, body-image risks, age-restricted goods, and graphic violence.
Today's changes are rolling out gradually.
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