SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI is broadening access to ChatGPT for Free and Go users by enabling unlimited text exchanges powered by GPT-5.6 Luna. The company announced that this update will roll out starting next week and will include safeguards to prevent misuse. During this phase, GPT-5.6 Luna will become the default model for these users. Additionally, free-tier users will gain a Think button that grants more time for the model to analyze complex questions before delivering a response.
This unlimited access specifically pertains to text-based conversations within ChatGPT. Restrictions for file uploads, image generation, and other processing-dependent features will remain in place. The Think feature will be available alongside the expanded text allowance next week, allowing Luna to engage in more thorough reasoning before generating answers. Consequently, ChatGPT users on Free and Go plans will enjoy greater access to core chat functionalities, although not all features will be unlimited.
GPT-5.6 comprises Luna, Sol, and Terra, each tailored for different performance levels and computing needs. Luna is positioned as the faster, more cost-effective option within this lineup. According to OpenAI, ChatGPT currently serves approximately one billion users each week across search, research, planning, writing, and various other activities. This latest update centers Luna as the primary model for standard experiences on Free and Go accounts while maintaining separate rules for tools outside ordinary text conversations.
Enhanced GPT-5.6 Sol controls now available for paid users
Subscribers of ChatGPT Plus and Pro will now have access to an upgraded GPT-5.6 Sol for their daily interactions. Sol supports both quick replies and more detailed reasoning within paid plans. The company notes that the revised model delivers more precise responses while avoiding extraneous details when shorter answers suffice. Paid users will also gain a reasoning slider on web, mobile, and desktop platforms, allowing adjustment of the amount of processing dedicated to research, planning, writing, coding, and similar tasks.
Internal testing indicates a reduction of approximately 62% in responses containing factual errors for GPT-5.6 Luna compared to GPT-5.5 Instant. Similarly, GPT-5.6 Sol demonstrated a decrease of about 68% in such errors under the same testing conditions. The company also highlighted improved handling of dates, numbers, sources, rules, and assumptions, especially when these details influence the accuracy of responses.
Ongoing safety measures apply across the expanded ChatGPT service
The new models incorporate additional protections specifically aimed at users under 18. The safeguards address topics such as romantic roleplay, age-restricted challenges, and claims that could substitute real-world relationships. They also enforce limits on sexual content, eating disorders, dangerous activities, restricted goods, and graphic violence. The company mentioned that new evaluation methods for responses involving younger users have been introduced. Unlimited text conversations for Free and Go accounts will continue to operate within the platform’s existing safeguards against abuse.
This update emphasizes improvements to the core ChatGPT experience and does not affect all products utilizing GPT-5.6. The GPT-5.6 Sol versions used in ChatGPT Work and Codex will remain unchanged under this release. Currently, paid subscribers can access the updated Sol model and reasoning controls, while Free and Go users will see Luna as the default model starting this week. The unlimited text chats and Think button will become available next week, with other tools like uploads and images continuing to have separate usage limits.