SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI is broadening access to ChatGPT by offering unlimited text conversations with GPT-5.6 Luna to Free and Go subscribers. The company announced that the new policy will start next week and will include safeguards to prevent misuse. During this rollout, GPT-5.6 Luna will also become the default model for these accounts. Additionally, Free users will gain access to a Think button, allowing the system more time to handle complex questions before providing an answer.
This new feature applies solely to text-based interactions and does not eliminate all usage limits across ChatGPT. OpenAI clarified that restrictions will still be in place for file uploads, image creation, and other tools that demand extra processing. The Think feature will debut together with unlimited text messaging next week, giving GPT-5.6 Luna additional reasoning capacity for tasks that require deeper analysis. The company maintains separate controls for features beyond basic chat, including tools that operate under different usage allowances.
OpenAI introduced GPT-5.6 as a suite of models, comprising Luna, Sol, and Terra. Luna is designed to be the faster, more cost-effective option within the lineup. The company states that ChatGPT now reaches nearly one billion weekly users engaged in searches, research, planning, writing, and other activities. With this latest update, users on Free and Go plans will see Luna as their primary ChatGPT model. This expansion enhances access to the core chat service while still maintaining tool-specific limits.
Updated reasoning capabilities available for paid subscribers
Subscribers to ChatGPT Plus and Pro will also benefit from a newer version of GPT-5.6 Sol for everyday use. Sol offers both quick responses and in-depth reasoning within the paid version. OpenAI reports that the update results in more precise answers and minimizes unnecessary details when a simpler reply suffices. Paid users will also gain a reasoning slider across web, mobile, and desktop platforms, enabling them to control how much processing power ChatGPT applies to tasks such as research, planning, coding, and writing.
OpenAI shared that internal evaluations of the latest models showed a decrease in factual inaccuracies. Testing focused on prompts related to finance, medicine, and law requiring detailed factual responses. According to the company, the percentage of responses with at least one factual error dropped by approximately 62% with GPT-5.6 Luna compared to GPT-5.5 Instant. For GPT-5.6 Sol, the reduction was about 68%. The company also noted improvements in Sol’s ability to handle dates, numbers, sources, rules, and assumptions when accuracy was critical.
Unlimited text interactions maintain strict safety measures
OpenAI stated that its latest ChatGPT models incorporate enhanced protections for users believed to be under 18. The systems are designed to prevent romantic roleplay, challenges involving age restrictions, and claims that could displace real-world relationships. They also impose limits on sexual content, eating disorders, risky activities, restricted items, and graphic violence. The company mentioned that new assessments have been added for responses involving younger users. Unlimited text conversations will continue to operate within the same safeguards when expanded access is available to Free and Go accounts.
This update mainly affects the primary ChatGPT experience and does not extend to all OpenAI products utilizing GPT-5.6 models. The company clarified that GPT-5.6 Sol versions used in ChatGPT Work and Codex will remain unchanged with this release. Paid users can now access the updated Sol model and reasoning controls. Meanwhile, Free and Go users will see Luna as their default model this week. Unlimited text chats and the Think button will be introduced next week, with other limits for images, uploads, and additional tools remaining in effect.