SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI is increasing accessibility to ChatGPT for Free and Go plan users by setting GPT-5.6 Luna as the default model. The company announced that unlimited text conversations will be launched next week, with safeguards in place to prevent misuse. Additionally, free users will soon have a Think button to facilitate more complex questions that require in-depth reasoning. However, restrictions will remain in effect for file uploads, image creation, and other features. These updates were disclosed on August 6 as part of a broader refresh to ChatGPT’s capabilities.
During this week’s rollout, GPT-5.6 Luna will serve as the default model for Free and Go accounts. The option for unlimited text exchanges and the Think button will become available in the following week. The Think feature allows Luna more time to analyze difficult questions before delivering a response. OpenAI clarified that the unlimited text access will still be monitored by abuse prevention measures. Since this change pertains to text conversations only, other ChatGPT features that involve additional processing—such as tools—will continue to have separate usage restrictions.
This expansion coincides with ChatGPT’s widespread use across the globe for various daily and professional tasks. According to OpenAI, over one billion people engage with ChatGPT weekly for activities including searches, planning, research, writing, and more. The company introduced the GPT-5.6 series in July, which includes Sol, Terra, and Luna. Luna is highlighted as the fastest and most affordable model within that lineup. The latest update places Luna at the core of the standard experience for users on Free and Go plans.
Paid ChatGPT Subscribers Access Enhanced GPT-5.6 Sol
Users of ChatGPT Plus and Pro are now benefiting from an upgraded version of GPT-5.6 Sol for their routine interactions. Sol is now responsible for both instant responses and more complex reasoning for these subscribers. OpenAI mentioned that this update results in more precise answers while reducing unnecessary details when simpler responses suffice. Additionally, Plus and Pro members gain a reasoning slider across web, mobile, and desktop platforms. This feature allows users to control how much processing power ChatGPT utilizes for each question, covering tasks like research, planning, writing, and coding.
OpenAI also shared that internal testing shows improvements in the factual accuracy of responses. The evaluation, which involved financial, medical, and legal prompts requiring precise details, found that responses containing at least one factual error decreased 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 added that the revised Sol model now handles dates, numbers, sources, rules, and assumptions more reliably when such specifics influence the answer.
Enhanced Access Comes with Safety Measures and Tool Usage Limits
OpenAI emphasized that its latest models incorporate additional protections, especially for users under 18. The systems have been trained to prevent romantic roleplay, age-restricted challenges, and claims that could substitute real-world relationships. Age-specific boundaries are also in place for content involving sexual material, eating disorders, dangerous activities, restricted goods, and graphic violence. The company stated that it implemented new assessments for responses involving minors. When the unlimited text feature becomes accessible to Free and Go accounts, it will still operate within the company’s safeguards against abuse.
This update mainly affects the core chat experience. OpenAI clarified that the GPT-5.6 Sol versions used in ChatGPT Work and Codex are not being updated at this time. Subscribers on paid plans can now access the improved Sol model along with the reasoning slider. Free and Go users will see Luna as the default model this week, with unlimited text chats and the Think button to follow next week. File uploads, images, and other tools will continue to have separate limitations even after the implementation of unlimited text messaging.