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Why free ChatGPT suddenly got smarter after trying paid-level 'Thinking'

OpenAI unveiled lightweight GPT-5.4 mini and GPT-5.4 nano models, allowing free users to use Thinking-based models. Previously, the GPT-5.4 Thinking model with advanced reasoning was available only to paying Plus or Pro subscribers. With the update, free and Go plan users can access the capability by selecting the Thinking option, which runs the mini or nano models in the background. Tests showed clearer decision-making steps and structured plans, with little performance drop and faster replies.