Jamayne Isaako reached 227 Test points in the final, overtaking Shaun Johnson's New Zealand record of 225.
Australia beat the Kiwis 32-12 at Suncorp Stadium in Brisbane, extending its World Cup winning streak to 23 matches.
The victory secured the Kangaroos' fourth consecutive title and their 13th overall, extending their hold on the trophy to 13 years.
Australia's last World Cup final defeat came against New Zealand in 2008; its subsequent victories came in 2013, 2017, 2022 and 2026.
A crowd of 52,461 watched Liam Martin score twice, with Jack Bostock also crossing before halftime.
Bradman Best scored after running down Jahrome Hughes, then Reece Walsh set up Tom Trbojevic early in the second half.
Casey McLean had scored New Zealand's first try, and Isaiah Papali'i added another from a Kodi Nikorima grubber.
Bostock's late try sealed the result, with the winger named player of the match.
James Tedesco entered for the closing six minutes to share the triumph.