I agree that the parent is clearly GPT-generated, but was it 3.5 or 4? I notice substantially improved human-like writing in GPT-4 that will probably be hard to

I agree that the parent is clearly GPT-generated, but was it 3.5 or 4? I notice substantially improved human-like writing in GPT-4 that will probably be hard to detect. Even the current AI detectors struggle (although they have gotten pretty good at detecting 3.5 writing)