SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI is significantly expanding access to ChatGPT for Free and Go users by eliminating text chat restrictions under GPT-5.6 Luna. The company announced that unlimited text interactions will commence next week, while safeguards against misuse remain in place. During this rollout, Luna is also becoming the default model for these plans. At the same time, Free users will be introduced to a Think button that enables the model to dedicate additional time for reasoning through more complex questions before responding.
The broader allowance applies primarily to standard text conversations, not the full suite of functions within ChatGPT. Limits will still be enforced for image creation, file uploads, and other tools that demand extra computational resources. OpenAI stated that the Think button will debut alongside the unlimited text feature next week. Users can activate it when a question requires more extensive reasoning. This update broadens the core conversational capabilities for Free and Go accounts, while maintaining separate restrictions for other tools and features.
GPT-5.6 includes a range of models, such as Luna, Sol, and Terra, each tailored for different performance demands. Luna functions as the faster, more cost-effective option in this lineup. OpenAI revealed that approximately one billion users engage with ChatGPT weekly for various tasks like research, planning, writing, and searching. With this latest update, Luna has become the primary ChatGPT model for Free and Go users. Meanwhile, other GPT-5.6 variants continue to be accessible within products designed for different workloads and access levels.
Broader free access while tool limitations stay intact
ChatGPT Plus and Pro members now receive an updated GPT-5.6 Sol model for everyday use and more advanced reasoning tasks. The company noted that Sol offers more targeted responses and reduces unnecessary details when shorter replies suffice. Paid subscribers also gain a reasoning slider available on web, mobile, and desktop platforms. This feature allows users to modify how much processing power the model applies to each request, supporting research, coding, writing, planning, and other activities that need different reasoning depths.
OpenAI shared results from its internal testing on the factual accuracy of its latest models, focusing on financial, medical, and legal questions that demand detailed factual responses. The company reported approximately 62% fewer answers containing at least one factual error with GPT-5.6 Luna compared to GPT-5.5 Instant. For GPT-5.6 Sol, the reduction was around 68% under the same testing conditions. OpenAI also noted improved handling of dates, numbers, sources, rules, and assumptions when such details impacted the accuracy of the final output.
Enhanced safeguards for younger users integrated into updated models
Safeguards have been added to the GPT-5.6 models to protect users under 18. These measures address issues such as romantic roleplay, age-restricted challenges, and claims that could promote replacing real-world relationships. Additional restrictions are in place for sexual content, eating disorders, risky activities, restricted goods, and graphic violence. OpenAI explained that it conducted further evaluations of responses involving younger users. The same abuse prevention measures will stay active when unlimited text conversations are accessible to Free and Go accounts under the expanded ChatGPT service.
This rollout impacts the main ChatGPT platform but does not alter every product utilizing GPT-5.6. Versions of GPT-5.6 Sol used in ChatGPT Work and Codex remain unchanged by this update. Currently, Plus and Pro subscribers can access the revised Sol model and reasoning controls. Meanwhile, Free and Go users are being provided Luna as their default model this week. The unlimited text conversations and Think button will be introduced next week, with separate limits still applying to images, uploads, and other intensive tools.