"Embracing my last week as a Sooner; as I've chose to transfer and further my education and football career at Texas A&M," he tweeted.
Jackson is the second Sooner to transfer to A&M. In December, running back Brandon Williams also left OU to play for first-year A&M head coach Kevin Sumlin, who was once the Sooners' wide receivers coach.
Jackson played in 11 games last season as a true freshmen and started late in the season against Baylor and in the Insight Bowl against Iowa. On the season, Jackson caught 12 passes for 165 yards, playing well down the stretch after the Sooners lost Ryan Broyles to a season-ending knee injury.
But Jackson faded into the background this spring, in part due to the emergence of true freshman Trey Metoyer, and did not participate in the Red-White spring game.
ESPN rated Jackson the No. 39 wide receiver in the country coming out of Arlington (Texas) Sam Houston High School.