SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI is broadening the availability of ChatGPT for Free and Go users by introducing GPT-5.6 Luna as the default model. The company announced that unlimited text conversations will be accessible starting next week, with safeguards in place to prevent misuse. Additionally, free users will soon see a Think button to facilitate questions requiring more in-depth reasoning. However, restrictions on file uploads, image generation, and other tools will remain in effect. These updates were revealed on August 6 as part of a larger upgrade to ChatGPT.
During this week’s rollout, GPT-5.6 Luna will become the default for Free and Go accounts. The availability of unlimited text interactions and the Think button will follow next week. The Think button allows Luna extra time to process complex questions before providing an answer. OpenAI confirmed that unlimited text access continues to be regulated by abuse prevention measures. Since this change impacts text conversations specifically, other ChatGPT features requiring additional processing will still have separate usage limits.
This expansion coincides with ChatGPT serving a vast global user base across daily and professional tasks. OpenAI reports that over one billion people use ChatGPT weekly for searches, planning, research, writing, and more. The company introduced the GPT-5.6 model family in July, including Sol, Terra, and Luna, with Luna positioned as the fastest and most affordable option within that lineup. The recent update puts Luna at the core of the standard experience for users on Free and Go plans.
Enhanced GPT-5.6 Sol Now Available for Paid ChatGPT Users
Subscribers of ChatGPT Plus and Pro now have access to an upgraded GPT-5.6 Sol for everyday interactions. Sol now powers both quick replies and more complex reasoning for these users. OpenAI stated that this update delivers more targeted answers and minimizes unnecessary details when simpler responses suffice. Plus and Pro users also benefit from a reasoning slider available across web, mobile, and desktop platforms. This feature allows users to control how much processing ChatGPT applies, especially for tasks involving research, planning, writing, and coding.
OpenAI also highlighted improvements in factual accuracy based on internal tests. The evaluation involved financial, medical, and legal prompts requiring precise details. Responses containing at least one factual mistake were about 62% less frequent with GPT-5.6 Luna compared to GPT-5.5 Instant. Similarly, GPT-5.6 Sol showed a reduction of approximately 68%. The company added that the updated Sol model handles dates, numbers, sources, rules, and assumptions more reliably, especially when these details influence the response.
New Access Comes with Safety and Tool Usage Limitations
OpenAI emphasized that its latest models feature additional safeguards aimed at users under 18. The systems are trained to avoid romantic roleplay, age-restricted challenges, and claims that could replace real-world relationships. They also include boundaries for sensitive content related to sexuality, eating disorders, dangerous activities, restricted products, and graphic violence. The company noted that new assessments have been added for responses involving younger users. The unlimited text feature will still adhere to the company’s safeguards against abuse once it becomes available to Free and Go accounts.
This update primarily affects the main chat experience. OpenAI clarified that the GPT-5.6 Sol versions used in ChatGPT Work and Codex remain unchanged with this release. Paid subscribers can now access the updated Sol model along with the reasoning slider. Meanwhile, Free and Go users are set to see Luna as their default model this week, with unlimited text conversations and the Think button launching next week. File uploads, images, and other tools will continue to have separate restrictions even after unlimited text messaging is enabled.