SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI is broadening its availability of ChatGPT for Free and Go users by defaulting to GPT-5.6 Luna as the primary model. The company announced that unlimited text interactions will be accessible starting next week, with safeguards in place to prevent misuse. Additionally, free users will soon be able to utilize a Think button for questions requiring more complex reasoning. However, restrictions on file uploads, image creation, and other functionalities will stay in effect. These modifications were revealed by OpenAI on August 6 as part of a larger update to the ChatGPT platform.
During this week’s rollout, GPT-5.6 Luna will become the standard model for Free and Go account holders, with the feature of unlimited text chats and the Think button scheduled to launch the following week. The Think feature allows Luna extra time to process more challenging questions before delivering an answer. OpenAI clarified that the unlimited text access remains governed by abuse prevention measures. This change pertains specifically to text exchanges rather than all ChatGPT features, meaning that separate restrictions will continue for tools that demand additional processing power.
This expansion aligns with ChatGPT’s extensive global user base that engages in a variety of daily and professional tasks, as ChatGPT now reaches an estimated one billion people weekly for activities like searches, planning, research, writing, and more. OpenAI introduced the GPT-5.6 series in July, which includes models Sol, Terra, and Luna, with Luna positioned as the fastest and most economical among them. The latest update centers Luna as the default experience for users on Free and Go plans, emphasizing its role as the primary model.
Enhanced GPT-5.6 Sol available to Paid Plans
Subscribers to ChatGPT Plus and Pro are now equipped with an upgraded version of GPT-5.6 Sol, designed to handle both quick responses and more detailed reasoning. OpenAI stated that this update results in more targeted answers and minimizes unnecessary details when simpler replies are sufficient. Additionally, Plus and Pro members now have access to a reasoning slider across web, mobile, and desktop interfaces, allowing them to control the extent of processing ChatGPT applies to each query, whether it involves research, planning, writing, or coding tasks.
OpenAI also highlighted improvements in factual accuracy based on its internal assessments, which included financial, medical, and legal prompts requiring precise information. The data showed responses with at least one factual mistake were approximately 62% less frequent with GPT-5.6 Luna compared to GPT-5.5 Instant. For GPT-5.6 Sol, the reduction was approximately 68%. The company also noted that the updated Sol model now manages dates, numbers, sources, rules, and assumptions more reliably when these details impact an answer.
Access Expansion Comes with Safety and Tool Restrictions
OpenAI stated that its latest models incorporate additional safeguards for users under 18, designed to prevent romantic roleplay, age-restricted challenges, and claims that could potentially replace real-world relationships. The models now include age-related limitations concerning sexual content, eating disorders, dangerous activities, restricted items, and graphic violence. The company explained that it has added new assessments for responses involving younger users and emphasized that the unlimited text feature will continue to operate within the company’s abuse safeguards once it becomes available to Free and Go accounts.
This update specifically targets the main chat experience; OpenAI confirmed that the GPT-5.6 Sol versions used in ChatGPT Work and Codex remain unchanged with this release. Currently, paid subscribers can access the updated Sol model and reasoning slider, while Free and Go users will see Luna as their default model this week, with unlimited text chats and the Think button following next week. Restrictions on file uploads, image generation, and other tools will stay in place even after unlimited text messaging is enabled.