OpenAI expands free ChatGPT access, improves GPT-5.6 Sol

Starting next week, ChatGPT free and Go users get unlimited text chats and a Think button for harder questions, with GPT-5.6 Luna as the default model. Plus and Pro users get an upgraded GPT-5.6 Sol that OpenAI says makes 68% fewer factual errors than GPT-5.5-Instant, plus a new thinking slider.
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