Anbu is like the Delta Force/Seal Team Six of the Naruto world, even though they are still fodder.Jonin or Chunin. Naruto and Sakura are beating them too easily. BTW I'm new here so is Anbu actually a class, cuz I thought that there were just Jonin that are secretive.
Don't give her that much credit.If Sakura could kill them, I'd say Academy level :|