Plenty of these fares extend June/July/August 2025 ex KIX or cough with slightly less availability ex HND/NRT. At a cursory look prices range from $1690 - $1800 for MEL, SYD (A380 second leg), ADL, BNE.
I flew this route in June (KIX > SIN > SYD) - Overnight flight with a small layover in SIN...