A new reasoning slider is also rolling out to Plus and Pro subscribers on web, mobile, and desktop. The control allows users to decide how much time ChatGPT spends reasoning before generating an answer, making it possible to prioritize speed for simple questions or deeper analysis for planning, research, writing, coding, and decision-making.
OpenAI also says GPT-5.6 Sol has been updated to improve factual accuracy, particularly for questions involving dates, numbers, sources, rules, and assumptions.
According to the company, an internal evaluation of financial, medical, and legal prompts found that responses containing at least one factual error were about 62% less common with GPT-5.6 Luna and 68% less common with GPT-5.6 Sol than with GPT-5.5 Instant.
Free users are also receiving expanded access. GPT-5.6 Luna will become the default model for Free and Go accounts, and OpenAI said unlimited text conversations are coming for those users. For more difficult questions, a new Think button will allow GPT-5.6 Luna to spend additional time reasoning before responding.
OpenAI noted that abuse protections will still apply, while limits on file uploads, image generation, and other tools remain unchanged.
The company said GPT-5.6 Sol included in this release is optimized specifically for everyday conversations within ChatGPT. It added that the version of GPT-5.6 Sol powering Work and Codex is not changing as part of the rollout.
OpenAI also highlighted additional safety measures introduced for younger users. The company said it trained the updated model to avoid romantic roleplay, age-restricted challenges, and presenting itself as a replacement for real-world relationships for users it believes are under 18. The model also includes expanded safeguards around sexual content, eating disorders, body image risks, dangerous activities, age-restricted goods, and graphic violence, while encouraging users to seek support from trusted people when appropriate.
The rollout begins today for Plus and Pro users, who can immediately access the updated GPT-5.6 Sol model and the new reasoning slider. GPT-5.6 Luna will become the default model for Free and Go users this week, with unlimited text chats and the Think button arriving next week, subject to abuse guardrails.
This analysis is based on reporting from OpenAI.
Image courtesy of OpenAI.
This article was generated with AI assistance and reviewed for accuracy and quality.
