I use https://originality.ai/ as the benchmark. I've tested all commercially available services, and Originality (at the time; its been a few months) provided the lowest false-positive rate. As a testing sample, I've built a database of articles written by various text generators and compare them against articles that I scrapped from web from before 2017 (basically any text before LLMs saw daylight).

I am sure that these algorithms have evolved, but given my past experiments, I sincerely doubt that we are at a point that (a) cannot be easily bypassed if you are targeting them, (b) do not create a lot of false-positives.

As stated in another comment, I personally "gave up" on trying to bypass AI detection [it often negatively impacts output quality], at least for my use case, and focus on creating highest-possible value content.

I know that services like Surfer SEO are continuing to actively invest in bypassing all detectors. But... as a human, I do not enjoy their content and that what matters the most.