Mercedes GLS-Class 2026 Review: AMG GLS63 Performance

The Mercedes GLS-Class stands as a flagship full-size SUV, combining opulent interiors, formidable powertrains, and versatile family accommodations. This vehicle excels in delivering a refined driving experience suited for both highway cruising and spirited performance, particularly in its high-performance AMG GLS63 guise. With seating for up to seven passengers and cutting-edge technology, it appeals to buyers seeking the ultimate blend of comfort and capability in a premium package.

Powertrain and Performance Excellence

At the heart of the GLS-Class, especially the AMG GLS63, lies a twin-turbocharged 4.0-liter V8 engine producing 603 horsepower, augmented by a 48-volt mild-hybrid system. This setup propels the SUV from 0-60 mph in as little as 3.6 seconds, outpacing many sports cars despite its substantial size and three-row configuration.

The power is delivered through a nine-speed automatic transmission paired with standard all-wheel drive (4MATIC+), ensuring seamless power distribution. In Sport and Sport+ modes, the engine’s responsive throttle and active anti-roll bars—powered by the hybrid system—maintain remarkable composure during aggressive maneuvers. Drivers report effortless surges to over 100 mph from a standstill, with a governed top speed of 174 mph.

Braking performance matches the acceleration, with strong, confident stops facilitated by massive Michelin Pilot Sport 4S tires (285/40ZR23 front, 325/35ZR23 rear). The air suspension adapts to various conditions, including off-road modes like Trail and Sand, though the GLS shines brightest on open roads rather than tight urban corners.

Interior Luxury and Space Optimization

Step inside the GLS-Class, and you’re enveloped in a cabin rivaling high-end sedans. The front seats offer ultra-supportive adjustments, heating, ventilation, and massage functions for long-journey comfort. Materials like Nappa leather and wood trim create an ambiance of understated elegance.

• Seating Capacity: Seven passengers across three rows, with the third row suitable for children or shorter adults.
• Second Row: Generous legroom and heated seats with optional power sunshades.
• Cargo Flexibility: Electrically folding seats expand boot space significantly.

The infotainment system features dual 12.3-inch screens, MBUX with voice control, and augmented reality navigation. Climate control zones maintain even temperatures, though initial setup requires familiarity.

Ride Comfort and Handling Dynamics

Mercedes engineers have tuned the GLS for plush highway travel, where the air suspension absorbs imperfections effortlessly—even on 23-inch wheels. The 48-volt system enables active elements like electric water pumps and anti-roll bars, keeping the body flat in corners without sacrificing ride quality.

While not as agile as smaller SUVs like the GLE 63 S, the GLS63 provides surprising grip and stability for its 5,000+ pound curb weight. Steering is precise yet light, prioritizing comfort over feedback, making it ideal for family road trips rather than track days.

Fuel Efficiency and Practical Considerations

Fuel economy reflects the V8’s thirst: EPA ratings for 2026 models are 15 mpg city and 20 mpg highway, improved slightly via new testing procedures. Real-world highway tests yield around 22 mpg, outperforming expectations for such power.

Starting at approximately $147,000 for the AMG GLS63, pricing escalates with options like larger wheels or premium audio. It differentiates from rivals like the BMW X5 M or Audi RS Q8 by offering a usable third row, positioning it as a ‘super SUV’ for families craving performance.

Design and Exterior Styling

The GLS-Class boasts a commanding presence with its over-five-meter length, bold grille, and AMG-specific aero enhancements. New wheel designs (21-23 inches) and LED lighting accentuate its muscular stance. Built in Alabama, it balances German engineering with American-scale utility.

Technology and Safety Features

Advanced driver aids include adaptive cruise control, lane-keeping, and 360-degree cameras. The MBUX system supports wireless Apple CarPlay/Android Auto and over-the-air updates, ensuring longevity.

Competitor Comparison

The GLS63 out-accelerates most peers while providing superior space. Against the BMW X5 M (two rows only) or Audi RS Q8, it offers better family practicality without fully compromising on speed.

Frequently Asked Questions (FAQs)

Is the Mercedes GLS63 suitable for off-roading?

Yes, with air suspension and modes like Trail and Sand, but it’s optimized for on-road performance.

How does the GLS63 compare in fuel economy to non-AMG models?

It edges out the GLS580 on highways due to efficiency tweaks, at 15/20 mpg city/highway.

Can adults fit comfortably in the third row?

It’s tight for adults but ideal for children; second row offers ample space.

What is the warranty on the 2026 GLS-Class?

Mercedes provides a 4-year/50,000-mile basic warranty; check official sites for details.

Does the GLS63 have hybrid technology?

Yes, a 48-volt mild-hybrid system boosts power and enables features like active anti-roll.

Why Choose the Mercedes GLS-Class?

For those prioritizing luxury, power, and versatility, the GLS-Class—led by the AMG GLS63—delivers an unmatched experience. Its ability to haul a family at sports-car speeds while maintaining sedan-like refinement sets it apart in the luxury SUV segment.