OpenAI is rolling out a broad ChatGPT update that gives paid users a more reliable GPT-5.6 Sol experience while moving Free and Go accounts to GPT-5.6 Luna. The changes are aimed at making everyday answers more focused, reducing factual mistakes, and giving people clearer control over how much reasoning ChatGPT uses.
Plus and Pro subscribers are getting an updated GPT-5.6 Sol that now powers both Instant replies and deeper reasoning in Chat. OpenAI says the model is designed to answer quick questions directly, add detail when a task requires planning, research, writing, or coding, and avoid repeating information after follow-up prompts. A new reasoning-effort slider on web, mobile, and desktop lets users keep responses quick or give the model more time for involved work.
We’re making better intelligence easier to access in ChatGPT for everyone:
— OpenAI (@OpenAI) August 6, 2026
- GPT-5.6 Sol now powers both Instant and deep reasoning for Plus & Pro users, delivering more factual, focused responses.
- Free & Go users get unlimited text chats with GPT-5.6 Luna starting tomorrow. pic.twitter.com/JXhmj5GLTH
Free and Go users will see GPT-5.6 Luna become their default model during the week of August 6. Starting the following week, OpenAI plans to offer those accounts unlimited text chats and a new Think button, which gives Luna more time on harder questions. Abuse guardrails will still apply, while separate limits will remain for file uploads, images, and other tools.
Reliability is a central part of the release. In OpenAI’s internal evaluation of financial, medical, and legal prompts requiring factual detail, answers containing at least one factual error were about 62 percent less common with GPT-5.6 Luna and 68 percent less common with GPT-5.6 Sol than with GPT-5.5 Instant. The company says Sol makes stronger use of sources when handling dates, numbers, rules, and assumptions, and is more willing to correct a premise rather than simply agree.
OpenAI says ChatGPT now serves one billion people each week across quick searches, advice, research, planning, and complex decisions. The updated Sol model is limited to ChatGPT’s Chat experience, and the Sol version used by Work and Codex is unchanged. OpenAI has also added safety training for users believed to be under 18, including boundaries around romantic roleplay, sexual content, eating disorders, dangerous activities, age-restricted goods, and graphic violence, with prompts to seek support from trusted people when needed.
