SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI is enhancing accessibility to ChatGPT by providing Free and Go users with unlimited text interactions powered by GPT-5.6 Luna. The company announced that this update will take effect next week and will continue to be governed by safeguards against misuse. During the current rollout, GPT-5.6 Luna is also set as the default model for eligible accounts. Additionally, free-tier users will gain a Think button, enabling the system to allocate more time to complex questions before delivering responses.
This new access primarily applies to text-based chats and does not eliminate all usage restrictions across ChatGPT. OpenAI clarified that limits will still be in place for file uploads, image generation, and other tools requiring extra processing power. The Think feature will be introduced alongside unlimited text messaging next week, giving GPT-5.6 Luna enhanced reasoning capabilities for more involved tasks. The company maintains separate controls for features beyond standard conversations, including various tools available under different usage allowances.
OpenAI unveiled GPT-5.6 as a family of models comprising Luna, Sol, and Terra, with Luna being the faster and more economical choice within the lineup. The company stated that ChatGPT now reaches approximately one billion weekly users across activities such as searches, research, planning, writing, and more. With this latest update, users on Free and Go plans will have Luna as their primary ChatGPT model. The rollout broadens access to the core chat service while maintaining tool-specific usage limits.
Paid subscribers receive an upgraded reasoning model
Subscribers of ChatGPT Plus and Pro are also getting an improved version of GPT-5.6 Sol for daily use. Sol offers both quick replies and deeper reasoning capabilities within the paid experience. OpenAI noted that this update results in more targeted answers and minimizes unnecessary details when simpler responses suffice. Paid users will also have access to a reasoning slider across web, mobile, and desktop platforms, allowing them to control how much processing effort ChatGPT applies to tasks like research, planning, coding, and writing.
The company further reported a significant decrease in factual inaccuracies during internal assessments of its latest models. These evaluations included financial, medical, and legal prompts demanding detailed factual responses. OpenAI indicated that answers with at least one factual error dropped by around 62% with GPT-5.6 Luna compared to GPT-5.5 Instant. For GPT-5.6 Sol, the reduction was approximately 68%. The firm also highlighted that Sol improved its handling of dates, numbers, sources, rules, and assumptions when precision was essential to the response.
Unlimited messaging maintains strict safety protocols
OpenAI emphasized that its latest ChatGPT models incorporate additional safeguards for users it considers under 18. These measures aim to prevent romantic roleplay, age-restricted challenges, and claims that might substitute for real-world relationships. They also set boundaries regarding sexual content, eating disorders, dangerous activities, restricted substances, and graphic violence. The company added that it has implemented new assessments for responses involving younger users. The expanded unlimited text conversations will still operate within the same safeguards when the access extension is available to Free and Go accounts.
This update focuses on the main ChatGPT platform rather than every OpenAI product utilizing GPT-5.6 models. The company clarified that GPT-5.6 Sol versions used in ChatGPT Work and Codex will not change with this release. Paid users can now access the updated Sol model along with new reasoning controls. Meanwhile, Free and Go users will receive Luna as their default model this week. Unlimited text chats and the Think button will be introduced next week, with separate limits remaining for images, uploads, and other tools.