The neon lights of Miami’s Brickell Avenue reflect off the wet asphalt as a low, wide silhouette glides through the city streets. The car is not making any noise, but its presence is undeniable. This is the Mercedes-AMG GT XX Concept, a rolling laboratory that previews the brand’s electric future and represents the most significant shift in AMG’s engineering philosophy since the brand was founded in 1967.
The GT XX is a technology program as much as it is a car. It is built on the new AMG.EA high-performance electric architecture and powered by three axial flux motors producing over 1,000 kW (1,360 horsepower). It is a car that can reach 360 km/h, charge from 10 to 80 percent in minutes, and sustain high-performance driving without overheating. And it signals exactly where AMG performance is heading.
The Axial Flux Revolution
The heart of the GT XX is its axial flux motor technology, developed in partnership with YASA, a British electric motor specialist and wholly owned subsidiary of Mercedes-Benz. Unlike conventional radial flux motors, which have a rotor spinning inside a stator, axial flux motors have two discs facing each other.
The advantages are substantial. Axial flux motors have three times the power density of conventional electric motors, are two-thirds lighter, and take up only one-third of the space. The front motor is just 9 centimeters wide, while the rear motors are only 8 centimeters wide. This compact packaging allows AMG engineers to optimize weight distribution and chassis dynamics without compromising interior space.
The GT XX uses three axial flux motors: two at the rear axle and one at the front. The rear motors form a High Performance Electric Drive Unit that produces the majority of the car’s power. The front motor acts as a booster, engaging only when additional traction or power is required, and can be disconnected via a Disconnect Unit to reduce energy loss during cruising.
The total system output is over 1,000 kW (1,360 horsepower), with a peak of 1,041 kW achieved during testing. The car can reach a top speed exceeding 360 km/h. In testing at Nardò, Italy, the GT XX broke 25 long-distance records, covering 40,075 kilometers in just over seven days at an average speed of 300 km/h.
The Battery: Inspired by Formula 1
The GT XX’s battery is a complete new development, drawing on experience from the AMG ONE hypercar and Formula 1. The high-performance battery uses more than 3,000 cylindrical NCMA cells with a silicon-enriched anode. The cells are tall and slim, enabling efficient cooling and an energy density of over 300 Wh/kg.
The battery’s direct cooling system is one of its most innovative features. An electrically non-conductive oil circulates through the pack, maintaining each of the more than 3,000 cells at the optimum temperature. This system ensures uniform heat dissipation and supports the battery’s ability to deliver high continuous power, even under sustained track use.
The battery operates on an 800-volt architecture, which reduces weight through lighter wiring and shortens charging times. The intelligent thermal management precisely controls cell temperature to ensure maximum performance even during intensive use.
Megawatt Charging: Refueling in Minutes
The GT XX’s charging performance is as revolutionary as its powertrain. At a prototype charging station, the car achieved a maximum charging power of 1,041 kW, reaching the 1 MW mark just 0.5 seconds after initiating charging. The system maintained 1,000 kW for approximately two and a half minutes, transmitting up to 1,176 amps of current through a specially developed liquid-cooled CCS cable.
The result is extraordinary. The system transmitted 17.3 kWh in just one minute, equivalent to 125 kilometers of range, and can add approximately 400 kilometers of range in just five minutes. This approaches the refueling speed of a combustion car, addressing one of the primary concerns of electric vehicle adoption.
The megawatt charging record was made possible by a specially developed prototype charging station that converted a Megawatt Charging System station originally designed for trucks into a system that works with a slim CCS cable. The findings from this program will flow directly into the development of new high-performance fast chargers for Mercedes-Benz charging parks in Europe and North America.
Aerodynamics: A Drag Coefficient of 0.198
The GT XX’s aerodynamic performance is equally impressive. The car achieves a drag coefficient of just 0.198, an exceptionally low figure for a vehicle with the performance and presence of a four-door coupe. At 300 km/h, approximately 83 percent of the motor’s energy is dedicated to overcoming aerodynamic drag, underscoring the importance of this development.
The car features active aerodynamic elements, including a patented active wheel design. Each 21-inch wheel is equipped with five movable carbon elements that adjust their geometry based on thermal and aerodynamic needs. If the system detects excessive brake temperatures, the blades open to maximize airflow. Under normal conditions, they seal to optimize aerodynamic efficiency, capturing residual energy through integrated micro-generators.
What the Concept Signals
The GT XX concept signals several key directions for AMG’s electric future. First, the axial flux motor will become the standard for AMG electric models, described as the “V8 of the electric era.” Production of these motors is set to begin in a new factory in Berlin, with capacity for thousands of units per year.
Second, the AMG.EA architecture will underpin multiple models, including a four-door sports car and an SUV. The SUV is expected to deliver over 1,000 horsepower and will be the first AMG SUV developed entirely in-house at AMG’s German headquarters.
Third, the GT XX’s focus on endurance and high-speed performance signals that AMG is prioritizing sustained performance over single-lap heroics. The car’s ability to maintain high power output and fast charging across extended sessions demonstrates that electric AMG models will be genuine track cars, not just quick in a straight line.
The Miami Evening
The GT XX concept has completed its demonstration along Brickell Avenue. Its axial flux motors have delivered the 1,360 horsepower that makes it one of the most powerful electric cars ever built. The active aerodynamics and 0.198 drag coefficient have kept it stable at speed. The driver has experienced a level of performance that is as exclusive as it is extraordinary.
The GT XX is not a production car. It is a technology program, a preview of what AMG’s electric future will look like. But it represents a significant moment in AMG’s history. It is the first electric car built on the AMG.EA architecture, the first with axial flux motors, and the first to demonstrate that electric performance can match combustion performance without compromise.
The GT XX is not just a car. It is a statement. It is a reminder that even in an era of electrification, AMG remains committed to the relentless pursuit of performance. The electric future has arrived. And it is faster than anyone expected.
