The 2021 Mercedes-benz Gls-class stands as the flagship SUV in the Mercedes-Benz lineup, embodying the pinnacle of luxury, comfort, and cutting-edge technology in a spacious three-row configuration. Following a comprehensive redesign in the previous year, the 2021 GLS-Class elevates the standard for large luxury SUVs, offering an unparalleled driving experience and cementing its position at the top of its class. This year welcomes the high-performance AMG GLS 63 model, further expanding the GLS family and catering to enthusiasts seeking exhilarating power alongside opulent features. While the market is populated with premium three-row SUVs, the GLS-Class distinguishes itself through its meticulous attention to detail, advanced engineering, and a commitment to passenger well-being.
The Upsides and Downsides of the 2021 GLS-Class
Pros:
- Unmatched comfort and spacious seating for adults across all three rows, making it a true family-friendly luxury SUV.
- Abundant technology and safety features designed to enhance convenience, safety, and the overall driving experience.
- Responsive engines coupled with composed handling, providing a driving feel more akin to a smaller, more agile SUV.
- Versatile cargo capacity that adapts to various needs, from daily errands to long road trips.
Cons:
- Certain interior controls and buttons are noted as being somewhat small or challenging to locate quickly, which may require a brief familiarization period.
What’s New for the 2021 GLS-Class?
For the 2021 model year, the Mercedes-Benz GLS-Class sees several key updates:
- The introduction of the new, high-performance AMG GLS 63 variant, injecting formidable power and sporty dynamics into the lineup.
- Minor revisions to the standard feature set, ensuring the GLS-Class remains at the forefront of luxury and technology offerings.
- This model year is part of the third GLS generation, which debuted in 2020 with a complete redesign, meaning the 2021 model benefits from all the advancements introduced in that major overhaul.
Edmunds Expert Rating: A Deep Dive into the 2021 GLS-Class
Our Verdict: Great – 8.6 out of 10
The Edmunds Vehicle Testing Team rigorously evaluates each vehicle, combining objective track testing with real-world driving assessments. The resulting Expert Ratings are based on over 30 criteria, covering every facet of the automotive experience. The 2021 Mercedes-Benz GLS-Class consistently impresses, earning a “Great” rating for its exceptional blend of comfort, performance, and advanced technology. It builds upon the strengths of the highly-rated GLE SUV, scaling up the experience into a larger, more capable package. The GLS-Class emerges as a truly well-rounded vehicle that excels in nearly every aspect.
Performance: 8.5/10
The performance figures of the 2021 GLS 450 are genuinely remarkable, suggesting a vehicle far smaller and sportier than its actual size. In Edmunds testing, the GLS 450 accelerated from 0 to 60 mph in just 6.2 seconds – an impressive feat for a luxury SUV with a base engine. The power delivery feels robust and readily available in all driving scenarios. The mild-hybrid system integrated into the engine enhances both performance and fuel efficiency, resulting in exceptionally smooth power transitions. A minor point of critique is occasional slight hiccups from the transmission. However, braking performance is outstanding, with stops from 60 mph achieved in a mere 105 feet, placing it within performance-car territory. This impressive braking is partly attributed to the no-cost summer tires equipped on the test vehicle, which also contribute to substantial lateral grip. The steering is light and responsive, making the GLS surprisingly easy to maneuver in tight city parking situations and through traffic.
Comfort: 8.5/10
Mercedes-Benz has truly mastered the art of on-road comfort with the 2021 GLS-Class. The seats are exceptionally supportive and offer a vast range of adjustments to accommodate various body types and preferences. Optional massage functions further enhance comfort, especially on longer journeys. The heated and ventilated seats operate effectively, and the automatic climate control system quickly and efficiently regulates cabin temperature. Noise intrusion from the outside environment is minimal, with only slight road noise noticeable on rougher road surfaces. The optional E-Active Body Control suspension elevates ride quality to an even higher level. It effectively smooths out most road imperfections, providing a composed and refined ride without excessive floating or wallowing sensations. Despite the potential for larger wheels to negatively impact ride quality in some SUVs, the test vehicle equipped with optional 21-inch wheels maintained excellent ride comfort.
Interior: 9/10
The interior of the 2021 GLS-Class is outstanding from nearly every perspective. The driving position is upright and commanding, yet passengers remain comfortably ensconced within the luxurious cabin. Ample space is available in all three rows, with even adults over 6 feet tall able to comfortably occupy the third row, which is also easily accessible. Large windows contribute to excellent all-around visibility and create a more open and less claustrophobic feeling for rear passengers. The controls are generally well-placed and within reach, although the sheer number of controls and the small text on some buttons may require some initial adjustment and muscle memory development to operate without diverting attention from the road. The separation of seat controls between the door panel and the infotainment system is a minor ergonomic quirk that some may find slightly inconvenient.
Technology: 9.5/10
Mercedes-Benz’s MBUX infotainment system is a technological marvel and sets a benchmark in the luxury SUV class, even if its comprehensive functionality presents a slight learning curve initially. The navigation system is particularly noteworthy, with its augmented reality overlay and turn-by-turn directions displayed in both the instrument cluster and head-up display. These features offer compelling alternatives to smartphone-based navigation apps. However, for those who prefer smartphone integration, both Apple CarPlay and Android Auto are standard. All three rows are equipped with USB-C ports, and a standard wireless charging pad is conveniently located in front of the cupholders. The driver-assistance features are equally impressive, with the adaptive cruise control system standing out as one of the best tested. In traffic, it maintains a sensible following distance and can bring the GLS to a complete stop and resume motion smoothly as traffic flow resumes.
Storage: 8/10
With the rear seats folded down, the 2021 GLS-Class provides up to 84.7 cubic feet of cargo space behind the front seats. With all rows upright, cargo space reduces to 17.4 cubic feet, which is adequate for daily use but may not be sufficient for luggage for all passengers on longer trips. While cargo space is decent for the class, it is less than the exceptionally spacious Lincoln Navigator, which offers 103.3 cubic feet with the rear seats down. The second and third-row seats fold flat and can be conveniently lowered using buttons located in the cargo hatch. Small-item storage is excellent, with numerous pockets, bins, and cupholders distributed throughout the cabin. The GLS 450 boasts a towing capacity of 7,700 pounds, surpassing its primary rival, the BMW X7. However, the Lincoln Navigator again takes the lead in towing capability, rated at 8,300 pounds.
Fuel Economy: 8/10
The EPA fuel economy ratings for the 2021 GLS-Class are 21 mpg combined (19 city/23 highway), which are impressive figures for a vehicle of this size and capability. In Edmunds’ real-world evaluation loop, the GLS matched its EPA combined rating of 21 mpg. Over extended driving distances in mixed traffic conditions and with passengers and cargo, the GLS returned 19 mpg.
Value: 8/10
The 2021 GLS-Class is not an inexpensive vehicle, but its exceptional build quality justifies its price point. While options can quickly increase the overall cost, the GLS remains competitively priced within the luxury SUV segment. No other competitor in this class offers such a comprehensively well-equipped package for a lower price. The four-year/50,000-mile bumper-to-bumper warranty is standard for the luxury vehicle class.
Wildcard: 8.5/10
The 2021 GLS-Class delivers on all expectations associated with the Mercedes-Benz brand. It features a refined, understated design and is packed with the latest and most advanced technology. As a luxury vehicle, it prioritizes ease of use and effortless performance, and the engine provides smooth, readily available power. The engine sound is also pleasing, particularly at full acceleration. The GLS is easy and enjoyable to drive, making it a pleasant environment to spend time in, whether for short commutes or long journeys.
Edmunds Recommendation: Which 2021 GLS-Class Model is Right for You?
Edmunds recommends the GLS 450 for most buyers. Its six-cylinder engine provides ample power while offering better fuel efficiency compared to the V8 models. It also offers access to the same range of standard and optional features as the higher trims. The primary reason to consider the V8-powered GLS 580 or the AMG GLS 63 would be for those who frequently engage in heavy towing. Regardless of the trim chosen, it is highly recommended to opt for the Driver Assistance Package Plus, which adds valuable features such as adaptive cruise control, enhancing both safety and convenience.
2021 Mercedes-Benz GLS-Class Models: Trim Levels and Key Features
The 2021 Mercedes-Benz GLS-Class is available in three main trim levels: GLS 450, GLS 580, and AMG GLS 63. Each trim is generously equipped with standard features, and a wide array of options allows for further customization. The primary differentiation between trims lies in the engine. (Note: The ultra-luxurious Maybach GLS is reviewed separately.)
GLS 450 (Base Trim)
- Engine: Turbocharged six-cylinder (362 hp)
- Transmission: Nine-speed automatic
- Drivetrain: All-wheel drive (4MATIC)
- Suspension: Adaptive air suspension (adjustable ride height and comfort/handling optimization)
- Seating: Seven passengers
- Features: Sunroof, heated and ventilated front seats, adaptive LED headlights, customizable ambient interior lighting, four-zone climate control, simulated leather upholstery (MB-Tex).
- Technology: MBUX infotainment system with dual 12.3-inch displays, Burmester surround-sound system, Apple CarPlay and Android Auto integration, wireless charging pad, nine USB ports, navigation, keyless entry and ignition.
- Safety & Driver Assistance: Forward collision mitigation, blind-spot monitoring, 360-degree camera system, automated parking system.
GLS 580 (Upgrades over GLS 450)
- Engine: Twin-turbo V8 (483 hp)
- Features: Five-zone climate control, leather upholstery, upgraded multi-contour front seats with massage.
AMG GLS 63 (Performance-Focused Trim)
- Engine: More powerful twin-turbo V8 (603 hp)
- Performance Features: High-performance brakes, sport suspension, AMG badging on supportive seats, heated and cooled front cupholders.
Optional Packages and Standalone Options:
- Driver Assistance Package Plus: Adaptive cruise control, lane keeping system, evasive steering assist, speed limit assist.
- E-Active Body Control (GLS 580 only): Advanced suspension for enhanced cornering comfort.
- Second-row captain’s chairs: Reduces seating to six passengers.
- Executive Rear Seat package: Upgraded second-row seating with enhanced comfort features.
- Rapid-heating front seats with heated front armrests and upper door panels.
- Head-up display.
- Acoustic Comfort package: Enhanced cabin noise insulation.
- Upgraded Burmester sound system.
- Panoramic sunroof.
