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TechRadar

Graham Barlow

I tested the new ChatGPT-5.4 mini and nano models — and I didn’t expect them to be this powerful

ChatGPT logo on a smartphone.

You’ve probably read about Sam Altman extolling the virtues of ChatGPT-5.4 Thinking as his “favorite model to talk to.” That’s great if you’re a Plus or Pro user, because you get access to that model. The rest of us on Free or Go accounts only have access to a version of ChatGPT based on GPT-5.3.

Until today, that is.

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