SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI is broadening the availability of ChatGPT for users on Free and Go plans by enabling unlimited text exchanges powered by GPT-5.6 Luna. The company announced that this update will begin next week, with safeguards in place to prevent misuse. During this rollout, GPT-5.6 Luna will serve as the default model for these users. Additionally, free-tier users will gain a Think button that allocates extra processing time for handling complex inquiries before generating responses.
This unlimited access specifically pertains to text interactions within ChatGPT, while separate limits will continue to regulate file uploads, image creation, and other functionalities that demand additional processing power. The introduction of the Think feature will coincide with the expanded text allowance next week, offering Luna more time to analyze and reason before responding. Consequently, users on Free and Go plans will enjoy broader access to the core chat experience without unlimited access to all auxiliary features.
GPT-5.6 comprises Luna, Sol, and Terra, each tailored for different performance levels and computational needs. Luna acts as the faster and more cost-effective option within the lineup. OpenAI reported that ChatGPT currently reaches approximately one billion users weekly across various tasks including search, research, planning, and writing. The latest deployment positions Luna as the primary model for standard experiences for Free and Go users, while maintaining distinct usage policies for tools outside regular text conversations.
Enhanced GPT-5.6 Sol Controls Now Available to Paid Subscribers
Subscribers of ChatGPT Plus and Pro are now receiving an upgraded version of GPT-5.6 Sol, optimized for daily conversations. Sol facilitates both quick replies and more in-depth reasoning within paid plans, with the company stating that the new model delivers more targeted responses and avoids unnecessary details when a shorter reply suffices. These users are also getting a reasoning slider across web, mobile, and desktop interfaces, allowing them to control how much computational effort ChatGPT invests in tasks like research, planning, writing, or coding.
Internal testing indicates a decrease in factual inaccuracies for the latest models, with results from financial, medical, and legal prompts showing about 62% fewer responses containing at least one factual error for GPT-5.6 Luna compared to GPT-5.5 Instant. Similarly, GPT-5.6 Sol exhibited a reduction of approximately 68% under the same evaluation methods. The company also highlighted improvements in the handling of dates, figures, sources, rules, and assumptions when such specifics influence an answer.
Safety Measures Maintained Across Broader ChatGPT Access
The newest models incorporate additional protections for users identified as being under 18, with safeguards covering areas such as romantic roleplay, age-restricted challenges, and claims that could substitute genuine relationships. Further boundaries address content related to sexuality, eating disorders, dangerous activities, restricted items, and graphic violence. The company mentioned the implementation of new assessments for responses involving younger users, and that unlimited text conversations for Free and Go accounts will continue to operate within the existing safeguards designed to prevent abuse.
This update primarily enhances the core ChatGPT experience and does not alter every product utilizing GPT-5.6. The GPT-5.6 Sol versions used in ChatGPT Work and Codex remain unchanged under this release. Paid subscribers can now access the latest Sol model and reasoning controls, while Free and Go users will see Luna as their default model starting this week. The unlimited text chats and the Think button will be available next week, with other tools like uploads and images still subject to separate usage restrictions.