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OpenAI is removing text-based chat limits for all ChatGPT users, which recently crossed 1 billion weekly users. The GPT-5.6 Luna model becomes the default for Free and Go users, replacing GPT-5.5, with a new Think button for harder questions. Plus and Pro users get an upgraded GPT-5.6 Sol model and a thinking slider.
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Summary by ByteBrief
OpenAI Updates GPT-5.6 Sol in ChatGPT Only