SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI is broadening the availability of ChatGPT for Free and Go users by enabling unlimited text-based interactions powered by GPT-5.6 Luna. The company announced that this update will commence next week, with safeguards still in place to prevent misuse. During the current rollout, GPT-5.6 Luna is set as the default model for these users, who will also gain a new Think button feature that allows the model additional time to analyze complex questions before providing an answer.
This unlimited access specifically pertains to text interactions within ChatGPT, while separate restrictions will remain in effect for other functionalities such as file uploads, image generation, and tools requiring extra processing. The Think button will be introduced alongside the expanded text allowance next week, giving Luna the ability to spend more time reasoning before responding. As a result, ChatGPT users on Free and Go plans will benefit from increased access to the core chat service, though this does not extend to unlimited use of all features available.
GPT-5.6 comprises Luna, Sol, and Terra, each tailored for different performance levels and computational demands. Luna is positioned as the faster and more economical option within this family. OpenAI noted that ChatGPT now engages approximately one billion users weekly across various tasks such as search, research, planning, and writing. The recent rollout emphasizes Luna as the standard experience for Free and Go accounts while maintaining distinct usage rules for tools outside the primary text conversation feature.
Enhanced GPT-5.6 Sol features now available for paid subscribers
Subscribers to ChatGPT Plus and Pro are now receiving an updated version of GPT-5.6 Sol, designed to improve daily interactions. Sol supports both quick responses and more in-depth reasoning within paid plans. The company explained that this revised model delivers more targeted replies and minimizes unnecessary details when brief answers suffice. Additionally, Plus and Pro members are now able to utilize a reasoning slider across web, mobile, and desktop platforms, giving them the ability to adjust the level of processing ChatGPT applies to research, planning, writing, coding, and similar tasks.
Internal testing has shown that the newest models have lower rates of factual inaccuracies, according to the company’s evaluations, which included prompts related to finance, healthcare, and legal topics requiring precise factual responses. The tests revealed about 62% fewer responses containing at least one factual error for GPT-5.6 Luna compared to GPT-5.5 Instant, while GPT-5.6 Sol saw a reduction of approximately 68% using the same assessment method. The company also reported improvements in handling dates, numbers, sources, rules, and assumptions when those details impacted an answer.
Safety protocols maintained across the expanded ChatGPT platform
These latest models incorporate additional safeguards for users identified as being under 18. The safeguards cover sensitive areas including romantic roleplay, age-restricted challenges, and claims that could substitute real-world relationships. They also implement new restrictions on sexual content, eating disorders, dangerous activities, restricted substances, and graphic violence. The company stated that new evaluations have been introduced for responses involving younger users. Unlimited text interactions for Free and Go accounts will continue to operate within the platform’s existing protections against abuse.
This update primarily affects the core ChatGPT experience and does not alter all products utilizing GPT-5.6. The GPT-5.6 Sol variants used in ChatGPT Work and Codex remain unchanged under this rollout. Paid subscribers can now access the updated Sol model and reasoning controls, while Luna will serve as the default model for Free and Go users starting this week. The unlimited text chats and Think button will be available next week, with other tools like uploads and images still subject to separate usage limits.