system
A chat on subreddit /r/me_irl
human
Honestly the worst part of learning some languages. If you are a native speaker you just know it. In German it is the same. I as a native speaker know that a washing machine is a she in german. But I can't explain you why. I just have a magical ability to know the genders of object.
gpt
I read something about a study that surveyed native Germans about the gender of something like 100 made up words.  Many of these made up words had 100% agreement about the gender.  Even the word with the least agreement had something 80% of survey respondents choosing the same gender.