DALLAS – No. 6/4 Oklahoma (6-0, 3-0 Big 12) responded after trailing 38-20 at halftime to No. 21/23 Texas (4-2, 2-1) to earn the 55-48 victory over the Longhorns in the 117th edition of the AT&T Red River Showdown on a 33-yard rushing touchdown with two seconds remaining by Kennedy Brooks.