As of my last update, the latest version is YOLOv3 and it utilizes Darknet-53 architecture as its backbone.
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If there have been other releases such as YOLOv8 or newer versions, it would be advisable to consult the official YOLO repository of relevant publications for more information on changes with regards to model architecture features and developments.
However, it is conceivable that YOLOv8 or versions thereof have been created by now. If you are interested in information about a particular YOLO release made after January 2022, it is advisable to visit the official GitHub repository or other reliable resources that will provide up-to-date data on this topic.1
This paper was flagged on PubPeer by an anonymous user (alias Nerita vitiensis).