The celebrations included fireworks and a performance with light displays, music and water jets.
It comes as the United Arab Emirates, Azerbaijan, Armenia, much of Georgia, Mauritius and the Seychelles crossed the threshold into 2026.
Earlier, Australia honored victims of the Bondi Beach attack with a moment of reflection while images of a menorah were projected onto Sydney Harbour Bridge.
A spectacular fireworks display over Sydney Opera House followed with 40,000 fireworks stretching more than four miles across buildings and barges along the harbour.