In a game that will be remembered for years, Oklahoma pulled off a monumental upset, knocking off No. 1 Texas 20-17 on a last-second field goal. The Sooners' victory was sealed after a costly interception by Texas quarterback Arch Manning, a moment that could define his college football legacy.

Manning, who had been stellar earlier in the season, finished 19-of-31 for 261 yards, three touchdowns, and two interceptions. He also added 20 rushing yards but was sacked twice. Both picks were devastating, but the final one, with just over a minute left, set up Oklahoma's game-winning 47-yard field goal by Tate Sandell as time expired.

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The Longhorns came out firing, needing just one play to score when Manning connected with Cam Coleman for a touchdown. They added two more long scoring drives to take a 17-7 lead into halftime, while Oklahoma's offense sputtered with five straight three-and-outs.

But the second half belonged to the Sooners. Quarterback John Mateer, who had faced criticism all season, led two long scoring drives to tie the game at 17-17 early in the fourth quarter. Then disaster struck for Texas: Manning threw a pick-six to Peyton Bowen, giving Oklahoma their first lead.

Manning briefly rebounded, leading a 90-yard touchdown drive to tie the game with 6:32 remaining. But after a missed 53-yard field goal by Gianni Spetic, Oklahoma got the ball back. The Sooners went three-and-out, giving Texas one last chance with 1:01 on the clock.

Manning drove the Longhorns to midfield, but on a pass attempt, Courtland Guillory intercepted it. Mateer then found Isaiah Sategna III twice for 33 yards, setting up Sandell's heroics.

The loss drops Texas into a tie for second in the SEC, and they now face three straight home games against conference rivals. Despite the setback, the Longhorns are still in prime position for a College Football Playoff berth if this proves to be their only loss.

For Oklahoma, this was their first-ever win over a No. 1-ranked Texas team, a moment that will resonate in the rivalry's storied history. As for Manning, he'll have to shake off this bitter defeat, but the echoes of this game will linger.