OpenAI updates GPT-5.6 Sol for sharper answers and gives free users unlimited Luna access

ChatGPT 推出改进版 GPT-5.6 Sol，并扩大免费用户访问权限

OpenAI rolled out an improved GPT-5.6 Sol for Plus and Pro users, tuned to give more focused answers and more reliable facts, with a slider to control thinking depth. Free users get GPT-5.6 Luna as the default, unlimited text chats, and a Think button for harder questions. The post shows a side-by-side example: when asked about biking in the rain, the old model listed wind speeds and temperatures, while Sol cut to 'no rain, but bring a windbreaker.' No benchmark scores or latency numbers are disclosed in the announcement.

Why it matters: OpenAI updated both paid and free tiers: Sol gets targeted tuning, Luna goes unlimited for free users with a Think button. Concrete changes with broad reach, but not a generational model update — caps at 82.