OpenAI rolls out a major ChatGPT upgrade, even if you don’t pay for it
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OpenAI is rolling out GPT-5.6 Sol for Plus and Pro users and GPT-5.6 Luna for Free and Go users. GPT-5.6 Sol is tuned for everyday ChatGPT conversations, delivering more focused answers, adaptive detail levels, and fewer factual errors — 68% fewer responses with at least one factual error compared to GPT-5.5 Instant. A new reasoning slider lets users control response speed vs. depth, from Instant to High. Free users gain unlimited text chats starting next week (subject to abuse protections) and a new Think button for deeper reasoning. The update does not affect GPT-5.6 Sol in Codex or ChatGPT Work. OpenAI is also adding stricter content protections for users believed to be under 18.
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GPT-5.6 Sol is getting more focused and reliable answersFree users are getting unlimited GPT-5.6 Luna chatsThe update does not affect GPT-5.6 Sol in Codex or WorkTest every layer before attackers doQuestions this post answers
How much more accurate is GPT-5.6 Sol compared to GPT-5.5 Instant in terms of factual errors?
GPT-5.6 Sol reduced responses containing at least one factual error by 68% compared to GPT-5.5 Instant in OpenAI's internal tests. GPT-5.6 Luna achieved a 62% reduction in the same evaluation. Sol is tuned for everyday ChatGPT conversations rather than longer agentic workflows, focusing on directness, adaptive detail, and avoiding unnecessary formatting. Developers tracking AI model accuracy improvements for tool selection find the latest benchmarks on daily.dev.
Will ChatGPT free users get unlimited messages with GPT-5.6?
Free and Go users will get unlimited text chats with GPT-5.6 Luna starting the week after the initial rollout, though usage remains subject to abuse protections. Limits still apply to file uploads, image generation, and other ChatGPT tools. Free users also get a Think button that gives GPT-5.6 Luna extra time to reason through harder questions. Teams deciding whether to upgrade ChatGPT plans or stay on free tiers track these changes on daily.dev.