Pep Guardiola‘s side made the perfect start, taking the lead in the fifth minute through Kevin de Bruyne, before Riyad Mahrez made it two from the penalty spot shortly after.
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Ilkay Gundogan stroked in a third after 21 minutes, before Raheem Sterling netted a spot-kick to make it four before the half-hour mark.
The visitors emerged from the interval with more attacking intent and pulled two quick goals back through James Maddison and Ademola Lookman before the hour mark.
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The Foxes then reduced the deficit to one through Kelechi Iheanacho, who tapped in after Ederson‘s tipped Maddison’s strike onto the bar.
The goals kept flowing as City re-established the two-goal lead through Aymeric Laporte, who expertly looped a header into the net from a corner.
Sterling netted his second of the game with three minutes remaining, finishing calmly from Ruben Dias‘ knock-down inside the box to make it 6-3.
View the best images from the rip-roaring clash via our gallery below.