GPT-5.6 Luna Free for All Users: Next-Gen AI Unleashed

GPT-5.6 Luna is now fully open and free for all users. This makes unlimited text conversations available to a billion users globally. What's interesting is that Luna is the smallest model in the GPT-5.6 family, designed for fast responses and low cost. It now replaces GPT-5.5 as the default for Free and Go tiers. Free users can also access a new "Think" button to allow the model more reasoning time on difficult questions. However, only text conversations are unlimited. Other features like file upload, image generation, and voice still have usage caps. The top-tier GPT-5.6 Sol has also received an upgrade. It now integrates Instant and Thinking modes into a single, adjustable speed, with a new slider to control reasoning time. This feature, previously exclusive to ChatGPT Work, is now available to all users. The new Sol provides shorter, more concise answers. This means more powerful AI capabilities are becoming widely accessible.