[3] Cox was announced the winner of Australia's Next Top Model, Cycle 7 at the Sydney Opera House on 25 October 2011, defeating Liz Braithwaite and Simone Holtznagel in the final.

[citation needed] In episode 11, Cox won the go-see challenge after designer Fernando Frisoni stated, "I would book her with my eyes closed.

In episode 13, designer Alex Perry likened her to Cindy Crawford and stated "she is the caliber of girl you would see in an international fashion magazine".

It was also announced that Cox would appear in the campaign for David Jones department stores for the 2012 Autumn/Winter collection[6] alongside models Miranda Kerr and Samantha Harris.

Subsequently, Cox made her runway debut at Milan Fashion Week Fall 2012, walking for a total of 5 shows which included Aquilano Rimondi, Bottega Veneta, Emilio Pucci, Etro and Jo No Fui.

At Paris Fashion Week Fall 2012, she walked for 11 shows including Andrew Gn, Cacharel, Carven, Chanel, Christian Dior, Kenzo, Lanvin, Mugler, Sacai and closed Felipe Oliveira Baptista and Vanessa Bruno.

[citation needed] In April 2012, she made her Australian Fashion Week debut walking for Carla Zampatti, Flannel, Manning Cartell, Ksubi, Toni Matičevski, Magdalena Veleveska, Jayson Brusdon, Camilla Franks, Lisa Ho, Ellery, WatsonxWatson, as well as opening Life with Bird and Ginger & Smart and closing Romance Was Born and Gary Bigeni.

At Milan Fashion Week Spring RTW 2013, Cox walked for 9 shows including DSquared2, Alviero Martini 1A Classe, Roccobarocco, Les Copains, Antonio Marras, Genny, Maurizio Pecoraro and Laura Biagiotti.

[17][18] Her father, Darryl Cox, is a former professional Australian rules footballer,[19] and her younger brother Nikolas is a current player for Essendon.