SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI is broadening access to ChatGPT for Free and Go subscribers by offering unlimited text conversations powered by GPT-5.6 Luna. The company announced that this update will take effect next week and will be implemented with safeguards to prevent misuse. During this phase, GPT-5.6 Luna is set as the standard model for these users. Additionally, free-tier users will have a Think button feature, providing extra time for the model to process complex inquiries before delivering a response.
This unlimited access is limited specifically to text interactions within ChatGPT. Separate restrictions remain for activities such as file uploads, image generation, and other functionalities that need additional processing. The Think button will be introduced next week alongside the expanded text allowance, enabling Luna to dedicate more time to reasoning before responding. Consequently, Free and Go ChatGPT users will have increased access to the core chat service, although not all features will be unlimited.
GPT-5.6 comprises Luna, Sol, and Terra, each tailored for varying performance levels and computational requirements. Luna is positioned as the faster, more cost-effective option within this lineup. OpenAI stated that ChatGPT now services approximately one billion users weekly across tasks such as search, research, planning, and writing. The recent rollout places Luna at the core of the standard experience for Free and Go accounts, maintaining separate usage policies for tools outside of regular text conversations.
Enhanced GPT-5.6 Sol controls now available to paid plans
Subscribers of ChatGPT Plus and Pro are now receiving an updated version of GPT-5.6 Sol for their daily interactions. Sol supports both quick replies and more in-depth reasoning within paid subscriptions. The company noted that this revised model provides more targeted responses and avoids unnecessary details when brief answers suffice. Paid users also now have access to a reasoning slider across web, mobile, and desktop platforms, allowing them to customize how much processing ChatGPT applies to research, planning, writing, coding, and similar tasks.
Internal testing indicates a reduction in factual inaccuracies with the latest models. Evaluations covered prompts related to finance, healthcare, and legal topics that demanded precise factual information. Results showed approximately 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 demonstrated a reduction of about 68% in errors under the same testing parameters. The company also highlighted improvements in handling dates, numbers, sources, rules, and assumptions when these details influence responses.
Safety protocols maintained across expanded ChatGPT access
The latest models incorporate additional safety measures for users identified as being under 18. The safeguards address issues such as romantic roleplay, age-restricted challenges, and claims that could substitute real-world relationships. Further restrictions target sexual content, eating disorders, risky activities, restricted substances, and graphic violence. The company also introduced new assessments for responses involving younger users. Unlimited text conversations for Free and Go accounts will continue to operate within the platform’s existing safety protocols against abuse.
This update primarily focuses on the core ChatGPT experience and does not alter all products utilizing GPT-5.6. The GPT-5.6 Sol versions used in ChatGPT Work and Codex will remain unchanged with this update. Paid subscribers can now access the updated Sol model and reasoning controls, while Free and Go users will have Luna as their default model starting this week. The unlimited text chat feature and Think button will be available next week, with uploads, images, and other tools still subject to separate usage limits.