OpenAI makes GPT-5.6 Sol more reliable and gives free users unlimited GPT-5.6 Luna — here's what the new tiering actually buys you

On **August 6, 2026**, **OpenAI** rolled out a major **ChatGPT** update: **GPT-5.6 Sol** gets a reliability upgrade for Plus and Pro subscribers, while free users gain **unlimited text conversations** with **GPT-5.6 Luna**. If you're still paying for ChatGPT without knowing what changed, here's the real cost-benefit math.