The AFC had a major shake-up after the thrilling Week 11 slate, even if not much changed in the standings. The Kansas City Chiefs are no longer the lone unbeaten, as the Buffalo Bills own the head-to-head tiebreaker over them for home-field advantage in the playoffs.

On Sunday, the Buffalo Bills defeated the Kansas City Chiefs, 30–21, finally giving the two-time defending champions their first loss of the season.

With Pittsburgh leading 15-10, the Ravens forced a turnover when Marlon Humphrey picked off Russell Wilson in the end zone. Jackson ran for 25 yards on first down, but a 15-yard completion to Henry on second down was wiped out by a penalty for an ineligible man downfield.