GPT-4 has been entirely unimpressive to me. I first used it 3 months after launch, when they had already degraded the quality significantly, and there was no "magic" moment. LAMDA (internal to Google) was actually the last time I had that sense of AI wonder, and since then, the GPTs are basically only incrementally better.

Edit: fixed the number - I thought it launched in January. It turns out late March was the launch, while the first hints/discussion about it were January. I got around to it in early July.

The people who have used GPT-4 seem to unanimously agree that the GPT-4 today is not the same as GPT-4 as released. Open ai is clearly holding back...