https://www.gamespot.com/articles/first-team-to-beat-destiny-2s-prestige-leviathan-r/1100-6454172/

Update: It's been discovered that Clan Redeem used an exploit to become the world's first team to complete the Leviathan Prestige Raid. However, this is not the same bug that caused Bungie to delay the Raid; instead, it's the so-called coil glitch that has been around since September. This is shown to be the case in a gameplay clip of Redeem making its way through the Raid--you can actually hear one player announce the glitch's use during a stream. So far, Bungie has not addressed the situation, though some fans feel Redeem's "world first" status should be disqualified in light of the exploit.

Original Story: Not much more than an hour after it first went live in Destiny 2 on PS4 and Xbox One, the Prestige version of Leviathan--effectively the Raid's hard mode--has already been beaten. Bungie has confirmed that at least one team has already emerged victorious.