o3-mini works well enough for me, it makes mistakes but generally it can always fix them eventually. Interestingly I found even if I include the line numbers as comments in the code it sees, it still often gets the line numbers wrong for edits (most often, off by one errors, likely due to it mixing up whether the line numbers are inclusive or exclusive). What does work a bit better is asking it to provide regex matching the first and last line of what it wants to replace, along with nearby line numbers (so if there are multiple matches in that file for the regex, it gets the right one).