GTA VI has been officially rated in Australia.
According to Gameroll on Twitter, they give each category a ranking and a key alongside it. This means that we can compare GTA VI's content to GTA V's. "The left image is what GTA VI received and on the right is GTA V's. This helps us put into perspective how far Rockstar is truly pushing things with this game. Pretty nuts considering that GTA V was considered VERY controversial at the time." I have also included RDR2 australia classification on the further right.