Australia extended its World Cup winning run to 23 matches, beating New Zealand 32-12 in the 2026 final at Brisbane's Suncorp Stadium.
The Kangaroos have claimed the last four titles and 13 overall. Their most recent final defeat came against the Kiwis in 2008.
In front of 52,461 spectators, Liam Martin scored twice, including the fastest try in World Cup history, after crossing in the second minute.
Jack Bostock also grabbed a double, while Bradman Best and Tom Trbojevic added tries in Australia's six-try win.
New Zealand's Casey McLean scored in the 12th minute, and Isaiah Papali'i crossed in the second half. Jamayne Isaako converted both tries.
Isaako's first conversion took his Test tally to 227, moving him past Shaun Johnson's 225-point record for New Zealand.
Australia controlled the middle through Isaah Yeo, Tino Fa'asuamaleaui and Cameron Murray, with Tom Dearden and Harry Grant contributing in attack.
James Tedesco entered late to celebrate another title. Player of the match Bostock sealed the result with his second try, set up by Best's flick pass.