The LEGO Ultimate Collector Series AT-AT released in 2021 has set number 75313.
LEGO set 75313 is a large collector model of the All Terrain Armored Transport, the four-legged Imperial walker seen prominently in The Empire Strikes Back. The model includes movable legs, an opening body and space for minifigures, reproducing the vehicle at a much larger scale than ordinary play sets.
Its release continued LEGO’s Ultimate Collector Series tradition of turning famous Star Wars vehicles into detailed display models. The AT-AT followed other large collector builds such as the Millennium Falcon and Imperial Star Destroyer.
Set numbers are often confused because LEGO assigns separate numbers to similar Star Wars products. The Millennium Falcon is 75192, the Imperial Star Destroyer is 75252, and the R2-D2 model is 75308. The 2021 UCS AT-AT is specifically 75313.