In sizzling sunshine in London, Brazilian forward Jesus produced a dazzling display, scoring twice before the break and going close to a hat-trick on several occasions.
Granit Xhaka and Gabriel Martinelli were also on target for the vibrant Gunners, who joined champions Manchester City on six points from two games.
Leicester twice clawed themselves back to within a goal of the hosts thanks to an own goal by William Saliba and a James Maddison striker, but they were comfortably beaten.
Player ratings from the match can be seen in the gallery above. To view the next image, just swipe.