Performance, power and 0-100 km/h
2026 Mercedes-Benz S-Class S 580 4MATIC has the quicker recorded 0-100 km/h time at 4.4 seconds, compared with 5.6 seconds for 2025 Audi A7 45 TFSI quattro S line. 2026 Mercedes-Benz S-Class S 580 4MATIC has the higher listed output at 503 hp; 2025 Audi A7 45 TFSI quattro S line is rated at 265 hp, a difference of 238 hp. The torque figures follow 2026 Mercedes-Benz S-Class S 580 4MATIC at 700 Nm and 2025 Audi A7 45 TFSI quattro S line at 370 Nm. These figures describe straight-line potential only; they do not establish braking performance, ride quality, steering response or durability under repeated hard use.
Range, battery, charging and efficiency
2025 Audi A7 45 TFSI quattro S line has the lower recorded consumption at 7.8 L/100km; 2026 Mercedes-Benz S-Class S 580 4MATIC is listed at 9.0 L/100km. Test cycle, temperature, wheel size and charging conditions can materially affect these results, so only figures measured on the same basis should be treated as directly comparable.
Dimensions, cargo space and towing
2026 Mercedes-Benz S-Class S 580 4MATIC provides the larger quoted cargo volume: 550 litres versus 535 litres, a difference of 15 litres. 2026 Mercedes-Benz S-Class S 580 4MATIC is 320 mm longer overall. Exterior size is not a benefit by itself: a longer body may create useful room, but cargo shape, rear-seat space and ease of parking still require a physical inspection.
Price and overall assessment
2025 Audi A7 45 TFSI quattro S line has the lower listed starting price at $68,900, compared with $128,400 for 2026 Mercedes-Benz S-Class S 580 4MATIC. 2026 Mercedes-Benz S-Class S 580 4MATIC leads in more of the shared headline fields, but that is not a universal verdict: a buyer should weight price, performance, range and utility rather than simply count category wins. The assessment is based on the specifications shown here; it is not presented as a two-car road test.