love this car

Yes it is based off of sesto elemento

"The Zentorno is heavily based on the Lamborghini Sesto Elemento, featuring the overall shape, hexagonal vents in the back of the car, twin roof scoops and triangular vents on the hood. The car's default color scheme when spawned at the player's garage in singleplayer is also reminiscent of the distinctive carbon-fibre-and-red colors of the Sesto Elemento. The front fascia, greenhouse area, rear diffuser, side vents and grille resemble that of the Lamborghini Veneno. Additionally, the car can be customized with a unique spoiler highly reminiscent of that on the Lamborghini Veneno. The headlights are based on the 2015 Acura NSX Concept. The A-pillar of the car may be based on the Lamborghini Huracán. The rear fascia is largely based on the Sesto Elemento, while also taking elements from the Veneno. The sides of the car and the tail lights are derived from the Lamborghini Aventador."

https://gta.fandom.com/wiki/Zentorno

I can see some Lamborghini Veneno styling in the spoiler, but I'm pretty sure the majority of the Zentorno is based off the Lamborghini Sesto Elemento

thats some gta 6 graphics hehe