Most distros haven't got to 5.15 yet, but openSUSE's downstream project GeckoLinux boasts 5.16 of the Linux kernel and the latest Cinnamon desktop environment.
Some of the big-name distros have lots of downstream projects. Debian has been around for decades so has umpteen, including Ubuntu, which has dozens of its own, including Linux Mint, which is arguably more popular a desktop than its parent. Some have only a few, such as Fedora. As far as we know, openSUSE has just the one – GeckoLinux.
The SUSE-sponsored community distro has two main editions, the stable Leap, which has a slow-moving release cycle synched with the commercial SUSE Linux Enterprise; and Tumbleweed, its rolling-release distro, which gets substantial updates pretty much every day. GeckoLinux does its own editions of both: its remix of Leap is called "GeckoLinux Static", and its remix of Tumbleweed is called "GeckoLinux Rolling".