SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI is expanding access to ChatGPT by offering Free and Go users the ability to engage in unlimited text exchanges with GPT-5.6 Luna. The company announced that this update will start next week and will be governed by safeguards to prevent misuse. During this rollout, GPT-5.6 Luna will serve as the default model for these accounts. Additionally, free users will gain a Think button, enabling the system to allocate more time for complex questions before providing a response.
This new access feature applies solely to text conversations and does not eliminate all usage restrictions across ChatGPT. OpenAI clarified that limits will still be enforced for file uploads, image generation, and other tools that require extra processing. The Think function will be introduced alongside unlimited text messaging next week, granting GPT-5.6 Luna extra reasoning time for more intricate tasks. The company continues to enforce separate controls for features beyond basic text conversations, including tools available under different usage allowances.
OpenAI revealed that GPT-5.6 comprises a family of models, including Luna, Sol, and Terra, with Luna positioned as the faster and more cost-efficient choice within the lineup. The company mentioned that ChatGPT now reaches approximately one billion weekly users across various activities such as searches, research, planning, writing, and more. As part of this latest update, users on Free and Go plans will have Luna as their primary ChatGPT model. This expansion increases access to the core chat service while maintaining specific limits on tools.
Paid subscriptions benefit from an upgraded reasoning model
Subscribers to ChatGPT Plus and Pro will also get access to an improved version of GPT-5.6 Sol for daily use. Sol supports both quick responses and deeper reasoning within the paid platform. OpenAI explained that this update delivers more targeted answers and minimizes unnecessary details when a simpler reply suffices. Subscribers will also have a reasoning slider available on web, mobile, and desktop interfaces. This feature allows users to select the level of processing ChatGPT applies to tasks such as research, planning, coding, and writing.
The company also noted a decrease in factual inaccuracies during internal assessments of its latest models, especially in responses involving financial, medical, and legal prompts that require precise factual information. OpenAI stated that answers with at least one factual error decreased by roughly 62% with GPT-5.6 Luna compared to GPT-5.5 Instant. For GPT-5.6 Sol, this reduction was approximately 68%. Furthermore, the company highlighted improvements in Sol’s ability to handle dates, numbers, sources, rules, and assumptions when accuracy was critical.
Unlimited messaging preserves safety restrictions separately
OpenAI emphasized that its latest ChatGPT models incorporate additional protections for users it believes to be under 18, aiming to prevent romantic roleplay, age-restricted challenges, and claims that could substitute real-world relationships. These safeguards also include boundaries related to sexual content, eating disorders, dangerous activities, restricted goods, and graphic violence. The company stated that new evaluations for responses involving younger users have been added. Despite the introduction of unlimited text conversations for Free and Go accounts, these interactions will still operate within the same abuse safeguards.
This update affects the primary ChatGPT interface 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 the new reasoning controls, while Free and Go users will see Luna as the default model this week. The unlimited text chats and Think button will be available next week, with separate limits still in place for images, uploads, and other tools.