Improving GPT‑5.6 Sol in ChatGPT, expanding GPT‑5.6 Luna access for free users
Points and comments are a snapshot, not live.
OpenAI updates GPT-5.6 Sol for Plus/Pro and expands free Luna access.
OpenAI improves GPT-5.6 Sol in ChatGPT for Plus/Pro users with more factual reliability (68% fewer factual errors on financial, medical, legal prompts vs GPT-5.5 Instant) and a new slider to control reasoning effort. Free users get GPT-5.6 Luna as the default model with unlimited text chats and a Think button for harder questions. Luna factual errors dropped 62% vs GPT-5.5 Instant. Safety measures include avoiding romantic roleplay and age-restricted content for users under 18.
What commenters are saying
Commenters largely welcome the free Luna expansion as a strong move, with one noting Luna is very good and another calling it 'pretty badass.' Some debate model quality: one user found Luna poor initially, while another says it replaced GPT 4.1 mini in projects. Others critique the reasoning slider and Think button as unnecessary complexity, with several preferring instant answers. A few see the free tier expansion as competitive pressure from Google's AI Overview and Gemini free tier.