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OpenAI announces GPT-5.6 Luna with an intelligence upgrade, and now Free and Go users can use the 'Think' button for more reasoning on harder questions.
OpenAI is giving free and Go tier ChatGPT users unlimited text chats starting next week, adding a 'Think' button, and upgrading the default model to GPT-5.6 Luna. Plus/Pro subscribers get an updated GPT-5.6 Sol with a thinking-effort slider.