OpenAI expands GPT-5.6 Luna to free ChatGPT users, upgrades GPT-5.6 Sol too

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OpenAI has officially confirmed improvements for both GPT-5.6 Sol and GPT-5.6 Luna, alongside new features designed to make ChatGPT feel faster, smarter, and more consistent. GPT-5.6 Sol becomes smarter for Plus and Pro usersOpenAI says GPT-5.6 Sol now provides more focused responses while making fewer factual mistakes. Free users receive unlimited chats and a new Think buttonPerhaps the biggest announcement targets free users. GPT-5.6 Luna will become the default model for both Free and Go users later this week. For more difficult questions, users can tap a new Think button, giving GPT-5.6 Luna additional reasoning time before responding.