SAN FRANCISCO, CALIFORNIA / RankWire.AI / – OpenAI has made GPT-5.6 Luna the default model for Free and Go users of ChatGPT, expanding unlimited text conversation capabilities. The company announced this update will roll out next week and will include safeguards to prevent misuse. During this period, GPT-5.6 Luna is now the primary model for these users. Additionally, free plan users will find a Think button introduced, allowing the model more time to analyze complex questions before generating a response.
This unlimited access specifically pertains to text-based interactions within ChatGPT, while separate limits remain in place for file uploads, image generation, and other advanced tools that require additional processing. The Think feature will be available next week alongside the expanded text limit, enabling Luna to spend more time reasoning before delivering an answer. As a result, ChatGPT users on Free and Go plans will enjoy broader access to the core chat functions without unlimited use of every feature offered.
GPT-5.6 features Luna, Sol, and Terra, each tailored for different performance levels and computational requirements. Luna is positioned as the faster and more cost-effective option within the family. OpenAI noted that ChatGPT now reaches approximately one billion users weekly across tasks like searching, research, planning, and writing. This recent rollout places Luna at the core of the standard experience for Free and Go accounts, while maintaining separate usage rules for tools outside of regular text conversations.
Updated GPT-5.6 Sol controls now available to paid subscribers
Subscribers to ChatGPT Plus and Pro are now receiving an enhanced version of GPT-5.6 Sol for their daily interactions. Sol is designed to support both quick responses and more in-depth reasoning within paid plans. The company stated that the revised model provides more targeted replies and minimizes unnecessary details when a shorter answer suffices. These users also gain access to a reasoning slider across web, mobile, and desktop platforms, allowing them to adjust how much processing power ChatGPT uses for research, planning, writing, coding, and similar activities.
Internal testing showed that the newest models have a lower rate of factual inaccuracies. Evaluations focused on financial, medical, and legal prompts that require precise factual responses. The results indicated about 62% fewer responses with factual errors for GPT-5.6 Luna compared to GPT-5.5 Instant. For GPT-5.6 Sol, the reduction was approximately 68%. The company also reported improvements in handling dates, numbers, sources, rules, and assumptions when such details influenced the answers.
Safety measures remain in place across the expanded ChatGPT platform
Additional protections have been integrated into the latest models to safeguard users identified as under 18. The safeguards address issues such as romantic roleplay, age-restricted challenges, and claims that could substitute real-world relationships. They also extend to sexual content, eating disorders, dangerous activities, restricted items, and graphic violence. The company mentioned the introduction of new assessments for responses involving younger users. The unlimited text conversation feature for Free and Go accounts will continue to operate within the platform’s existing abuse protections.
This update emphasizes the main ChatGPT experience and does not alter all products utilizing GPT-5.6. The GPT-5.6 Sol versions used in ChatGPT Work and Codex remain unchanged with this release. Paid subscribers 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 unlimited text chats and the Think button will be available next week, whereas uploads, images, and other tools will still have separate usage restrictions.