SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI is broadening the availability of ChatGPT by offering Free and Go users unlimited text conversations with GPT-5.6 Luna. The company announced that this update will commence next week, with safeguards against misuse still in place. During the current rollout, GPT-5.6 Luna also becomes the default model for those accounts. Additionally, free users will gain a Think button that enables the system to allocate more time to tackle complex questions before providing responses.
This new access pertains solely to text chats and does not eliminate all usage restrictions across ChatGPT. OpenAI clarified that limits will still apply to file uploads, image generation, and other tools requiring extra processing. The Think feature will be introduced alongside unlimited text messaging next week, giving GPT-5.6 Luna increased reasoning capacity for tasks demanding deeper analysis. The company continues to enforce separate controls on features beyond standard text conversations, including tools available under different usage allowances.
OpenAI has introduced GPT-5.6 as a collection of models that includes Luna, Sol, and Terra. Luna acts as the faster, more economical option within the lineup. The company noted that ChatGPT now reaches nearly one billion weekly users across searches, research, planning, writing, and other applications. With this latest update, users on Free and Go plans will have Luna as their primary ChatGPT model. The expansion increases access to the core chat service while maintaining tool-specific limits.
Enhanced reasoning model available for paid subscriptions
Subscribers of ChatGPT Plus and Pro are also receiving an upgraded version of GPT-5.6 Sol for daily use. Sol facilitates both quick replies and more comprehensive reasoning within the paid tier. OpenAI stated that this update results in more targeted answers and minimizes unnecessary details when a simpler response suffices. Paid users also gain a reasoning slider across web, mobile, and desktop platforms. This feature allows users to determine how much processing ChatGPT applies to research, planning, coding, writing, and other tasks.
The company also reported reductions in factual inaccuracies during internal testing of its latest models. These tests involved financial, medical, and legal prompts that required precise factual responses. OpenAI indicated that answers containing at least one factual error decreased by roughly 62% with GPT-5.6 Luna compared to GPT-5.5 Instant. Similarly, errors dropped by approximately 68% for GPT-5.6 Sol. Furthermore, Sol showed improvements in managing dates, numbers, sources, rules, and assumptions when such details were critical to the answer.
Separate safety restrictions maintained despite unlimited messaging
OpenAI stated that its latest ChatGPT models incorporate additional safeguards for users under 18. These protections aim to prevent romantic roleplay, age-restricted challenges, and claims that could substitute for real-world relationships. Boundaries concerning sexual content, eating disorders, risky activities, restricted items, and graphic violence are also in place. The company added that new assessments have been introduced for responses involving younger users. Unlimited text conversations will continue to function within existing abuse safeguards once expanded access begins for Free and Go accounts.
This update focuses on the primary ChatGPT experience rather than all OpenAI products utilizing GPT-5.6 models. OpenAI clarified that GPT-5.6 Sol versions used in ChatGPT Work and Codex remain unchanged with this release. Currently, paid users can access the updated Sol model and reasoning controls. Meanwhile, Free and Go users will see Luna as their default model this week. The unlimited text chats and Think button will be available next week, with separate limits still in effect for images, uploads, and other tools.