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