I’m going to speculate a bit here, FIM may stand for something-in-the-middle? I know there are the original autocomplete models that simply complete the ending

I’m going to speculate a bit here, FIM may stand for something-in-the-middle? I know there are the original autocomplete models that simply complete the endings. Then there are Cursor like models capable of editing/filling text between blocks of code. In essence, they look at both the text before the insertion point and after it - then find the best fitting completion in the middle. My guess is FIM is the latter.