SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI is broadening the availability of ChatGPT by offering unlimited text conversations with GPT-5.6 Luna to Free and Go users. The company announced that this change will take effect next week and will be implemented with safeguards to prevent misuse. During the current rollout, GPT-5.6 Luna is becoming the default model for those accounts. Additionally, free users will now see a Think button, enabling the system to spend more time on complex questions before providing a response.
This new access feature applies exclusively to text chats and does not eliminate all usage limits across ChatGPT. OpenAI clarified that restrictions on file uploads, image generation, and other resource-intensive tools will remain in place. The Think feature will launch alongside unlimited text messaging next week, offering GPT-5.6 Luna extra reasoning time for tasks that demand more detailed analysis. The company continues to enforce separate controls for features beyond standard text conversations, including tools available under different usage limits.
OpenAI has introduced GPT-5.6, a family of models that includes Luna, Sol, and Terra. Luna is designed to be the faster and more cost-effective option within this lineup. The company stated that ChatGPT now has approximately one billion weekly users involved in searches, research, planning, writing, and other activities. With the latest update, Luna will serve as the primary ChatGPT model for users on Free and Go plans. This rollout broadens access to the core chat service while maintaining tool-specific limitations.
Paid Subscribers Receive an Enhanced Reasoning Model
Subscribers to ChatGPT Plus and Pro will now have access to an updated version of GPT-5.6 Sol for everyday use. Sol offers both quick responses and more in-depth reasoning within the paid experience. OpenAI stated that this update results in more targeted answers and reduces unnecessary details when a simpler reply suffices. Paid users can also utilize a reasoning slider across web, mobile, and desktop platforms, allowing them to control how much processing power ChatGPT allocates for tasks such as research, coding, writing, and planning.
Internal tests show a notable decrease in factual errors for the latest models. These evaluations focused on responses to financial, medical, and legal prompts that require detailed accuracy. OpenAI reported that answers with at least one factual mistake fell by about 62% when comparing GPT-5.6 Luna to GPT-5.5 Instant. For GPT-5.6 Sol, the reduction was approximately 68%. The company also highlighted improvements in Sol’s ability to handle dates, numbers, sources, rules, and assumptions when these details are crucial to the response.
Separate Safety Measures Maintain Limits for Unlimited Text Access
OpenAI emphasized that its latest ChatGPT models include added protections for users under 18. These measures aim to prevent romantic roleplay, age-restricted challenges, and claims that could substitute real-world relationships. Content boundaries also cover sexual material, eating disorders, dangerous activities, restricted goods, and graphic violence. The company stated that new evaluations have been introduced to monitor responses involving younger users. Although unlimited text conversations are now available, they will still operate within the same safeguards designed to prevent abuse when expanded access is granted to Free and Go accounts.
This update focuses on the main ChatGPT interface rather than every OpenAI product utilizing GPT-5.6 models. OpenAI confirmed that GPT-5.6 Sol versions used in ChatGPT Work and Codex remain unchanged with this release. Existing paid users can access the updated Sol model and reasoning controls immediately. Meanwhile, Free and Go users will see Luna as their default model this week. The launch of unlimited text chats and the Think button will occur next week, with other restrictions on images, uploads, and tools staying in effect.