SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI announced this week that ChatGPT users on Free and Go plans in the United States will now be able to engage in unlimited text conversations powered by GPT-5.6 Luna. The company explained that the update, which begins next week, will be subject to safeguards designed to prevent misuse. During this rollout, GPT-5.6 Luna is becoming the default model for these users. Additionally, Free users will gain a new Think button feature, granting the model extra time to process intricate questions before generating responses.
This unlimited access is specifically applicable to text-based interactions within ChatGPT. Separate restrictions will persist for activities like file uploads, image creation, and other functionalities that require additional computational resources. The Think button will be introduced next week alongside the expanded text limit, enabling Luna to dedicate more time to reasoning before providing an answer. As a result, ChatGPT users on Free and Go plans will enjoy broader access to the core chat service, although not all features will be available with unlimited use.
GPT-5.6 incorporates Luna, Sol, and Terra, each tailored for varying levels of performance and computational needs. Luna is the faster, more economical option within this lineup. OpenAI stated that ChatGPT now reaches roughly one billion users each week for tasks such as search, research, planning, and writing. The latest update positions Luna as the default experience for Free and Go accounts, while maintaining distinct usage rules for tools outside of regular text conversations.
Paid subscribers get new GPT-5.6 Sol control options
ChatGPT Plus and Pro members are now receiving an improved version of GPT-5.6 Sol for their daily interactions. Sol supports both quick replies and more comprehensive reasoning within paid plans. The company noted that the updated model provides more targeted responses and omits unnecessary details when shorter answers suffice. Subscribers also gain access to a reasoning slider across web, mobile, and desktop platforms. This feature allows users to adjust how much processing ChatGPT applies to tasks such as research, planning, writing, and coding.
Internal testing shows that the latest models exhibit a lower rate of factual inaccuracies, according to company data. The assessments involved financial, medical, and legal prompts requiring accurate factual responses. Results indicated approximately 62% fewer responses with at least one factual error for GPT-5.6 Luna compared to GPT-5.5 Instant. Similarly, GPT-5.6 Sol demonstrated a reduction of about 68% in factual errors under the same testing conditions. The company also reported improvements in handling dates, numbers, sources, rules, and assumptions that influence answer accuracy.
Expanded ChatGPT access maintains safety protocols for younger users
The newest models feature enhanced protections for users identified as under 18. The safeguards encompass areas such as romantic roleplay, age-restricted challenges, and statements that could substitute real-world relationships. Additional restrictions address sexual content, eating disorders, dangerous activities, restricted items, and graphic violence. The company also indicated that new evaluations are in place for responses involving minors. The unlimited text conversations for Free and Go accounts will continue to adhere to the platform’s existing abuse prevention measures.
This update primarily affects the main ChatGPT experience and does not alter every GPT-5.6-powered product. The GPT-5.6 Sol versions used in ChatGPT Work and Codex remain unchanged with this release. Access to the updated Sol model and reasoning controls is now available for paid subscribers. Meanwhile, Free and Go users will have Luna set as their default model starting this week. The unlimited text chat feature and Think button will be available next week, while upload, image, and other tool limits will remain separate.