The Sian showcases Lamborghini's cutting-edge design language with sharp lines, aggressive angles, and aerodynamic styling. It combines elements from previous Lamborghini models like the Aventador and the Terzo Millennio concept car.  The Sian is powered by a hybrid powertrain, making it Lamborghini's first hybrid production car. It features a naturally aspirated 6.5-liter V12 engine combined with a 48-volt electric motor. The V12 engine produces 774 horsepower (577 kW), while the electric motor adds an additional 34 horsepower (26 kW), bringing the total power output to 808 horsepower (602 kW)

With its powerful hybrid powertrain, the Sian is an incredibly fast car. It can accelerate from 0 to 60 mph (0 to 97 km/h) in under 2.8 seconds and has a top speed of over 217 mph (350 km/h). Lamborghini claims it is the fastest-accelerating Lamborghini ever produced.  The Sian features Lamborghini's Independent Shifting Rod (ISR) gearbox, a seven-speed automatic transmission that delivers rapid gear shifts for seamless acceleration.  The Sian's hybrid system incorporates supercapacitor technology, which stores and releases electrical energy more efficiently than traditional lithium-ion batteries. This system provides an immediate power boost during acceleration, enhancing performance.   The Sian has a distinctive exterior design with sharp aerodynamic lines and a large rear wing that extends when needed for added downforce. The car also features Y-shaped headlights, a hexagonal exhaust system, and a low-slung profile.

The Sian's interior is luxurious and driver-focused, with premium materials, carbon fiber accents, and a modern cockpit layout. It offers advanced technology and comfort features, including a fully digital instrument cluster and a touchscreen infotainment system.

The Lamborghini Sian is a highly exclusive car, with only 63 units produced. Each car is custom-built according to the owner's preferences, allowing for a high level of personalization.  The Sian represents Lamborghini's commitment to innovation and sustainability. While it is a hybrid car, it still retains Lamborghini's iconic V12 engine, showcasing a balance between performance and environmental consciousness.