2025 Mercedes-Benz GLS-Class vs 2026 BMW X6 M
Comparison Overview
Deciding between supreme luxury transport and outright performance in a crossover often boils down to budget versus bragging rights. The 2025 Mercedes-Benz GLS-Class starts at a substantially lower MSRP of $89,200, compared to the 2026 BMW X6 M's steep $134,600 asking price—a $45,400 difference. While the X6 M dominates in performance, boasting 617 hp against the GLS's 375 hp, the Benz offers greater fuel economy, achieving a combined 21 MPG versus the performance-oriented X6 M's unspecified, but significantly lower, efficiency. Furthermore, the GLS is longer at 205.0 inches, suggesting more interior space, while the X6 M compensates with a slightly larger 27.4 cu ft cargo area, although the GLS has a much lower curb weight, impacting its driving dynamics.
Size Comparison
Performance
Fuel Efficiency
Full Specifications
Our Verdicts
2025 Mercedes-Benz GLS-Class
The GLS-Class is the clear winner for commuting due to its higher implied efficiency (21 combined MPG) and less imposing dimensions for city navigation.
2025 Mercedes-Benz GLS-Class
With a longer profile (205.0 inches) and likely superior rear seat space implied by its size class, the GLS is better suited for transporting families.
2026 BMW X6 M
The X6 M is the obvious choice for enthusiasts, delivering an overwhelming advantage with 617 hp and 553 lb-ft of torque.
2025 Mercedes-Benz GLS-Class
The GLS offers substantial luxury and AWD capability for $45,400 less than the high-strung X6 M, representing vastly better dollar-for-dollar utility.
Choose the Mercedes-Benz GLS-Class if...
- You prioritize saving over $45,000 upfront by selecting the $89,200 GLS.
- Your driving involves more daily errands where 21 combined MPG is a significant benefit.
- You need the most outright length available, measuring 205.0 inches long for maximum interior volume.
Choose the BMW X6 M if...
- Uncompromised performance is paramount, given the X6 M’s massive 242 hp advantage over the GLS.
- You value slightly more practical hauling capacity, evidenced by its 27.4 cu ft of cargo space.
- You prefer a slightly narrower vehicle (79.5 inches vs. 79.9 inches) despite the overall performance focus.
Key Dimensions
| Dimension | Mercedes-Benz GLS-Class | BMW X6 M |
|---|---|---|
| Length | 205.0" | 194.8" |
| Width | 79.9" | 79.5" |
| Height | 71.8" | 66.7" |
| Wheelbase | 123.4" | 117.0" |
Features Comparison
Safety
| Feature | Mercedes-Benz | BMW |
|---|---|---|
| Blind Spot Monitor | ✓ | ✓ |
| Lane Departure Warning | ✓ | ✓ |
| Lane Keeping Assist System | ✓ | ✓ |
| Front Cross Traffic Alert | ✓ | — |
| Rear Cross Traffic Alert | ✓ | ✓ |
| Driver Attention Alert | ✓ | ✓ |
| Pre-Collision Safety System | ✓ | ✓ |
| Post-Collision Safety System | ✓ | ✓ |
| Dual Front Side-Mounted Airbags | ✓ | ✓ |
| Front Head Airbags | ✓ | ✓ |
| Rear Head Airbags | ✓ | ✓ |
| Third Row Head Airbags | ✓ | — |
| Passenger Airbag Occupant Sensing Deactivation | ✓ | ✓ |
| Electronic Stability Control | ✓ | ✓ |
| Traction Control System | ✓ | ✓ |
| LATCH System | ✓ | ✓ |
| Rear Door Child Safety Locks | ✓ | ✓ |
| Anti-lock Brakes (ABS) | 4-Wheel | 4-Wheel |
| Brake Drying | ✓ | ✓ |
| Front Ventilated Disc Brakes | ✓ | ✓ |
| Rear Ventilated Disc Brakes | ✓ | ✓ |
| Brake Preparation System | ✓ | ✓ |
| Brake Assist | ✓ | ✓ |
| Tire Pressure Monitoring System | ✓ | ✓ |
| Automatic Headlights | ✓ | ✓ |
| Headlight Delay-Off | ✓ | ✓ |
| LED Headlights | ✓ | ✓ |
| Adaptive Headlights | ✓ | ✓ |
| Daytime Running Lights | ✓ | ✓ |
| Cornering Lights | ✓ | — |
| Integrated Turn Signal Mirrors | ✓ | ✓ |
| Front Headrests | 2 | 2 |
| Front Power Adjustable Headrests | ✓ | ✓ |
| Rear Headrests | 3 | 3 |
| Rear Height Adjustable Headrests | ✓ | ✓ |
| Rear Center 3-Point Seatbelt | ✓ | ✓ |
| Anti-Theft Alarm System (Remote) | ✓ | ✓ |
| Engine Immobilizer | ✓ | ✓ |
| Self-Leveling Headlights | — | ✓ |
Engine
| Feature | Mercedes-Benz | BMW |
|---|---|---|
| Base Engine Displacement | 3.0 L | 4.4 L |
| Number of Cylinders | inline 6 | V8 |
| Base Engine Type | mild hybrid | mild hybrid |
| Horsepower | 375 hp @ 5800 rpm | 617 hp @ 6000 rpm |
| Torque | 369 lb-ft @ 1800 rpm | 553 lb-ft @ 1800 rpm |
| Number of Valves | 24 | 32 |
| Camshaft Type | Double overhead cam (DOHC) | Double overhead cam (DOHC) |
| Variable Valve Timing | Variable | Variable |
| Fuel Injection Type | ✓ | ✓ |
Drive Train
| Feature | Mercedes-Benz | BMW |
|---|---|---|
| Transmission Type | 9-speed shiftable automatic | 8-speed shiftable automatic |
| Drivetrain Type | all wheel drive | all wheel drive |
| Center Differential Type | Limited Slip | — |
| Hill Descent Control | ✓ | ✓ |
| [object Object] | — | ✓ |
| [object Object] | — | ✓ |
Fuel
| Feature | Mercedes-Benz | BMW |
|---|---|---|
| Fuel Type | premium unleaded (required) | premium unleaded (required) |
| EPA Fuel Economy (City/Highway) | 19/24 MPG | — |
| EPA Fuel Economy (Combined) | 21 MPG | — |
| EPA Driving Range (City/Highway) | 452.2/571.2 mi. | 0/0 mi. |
| Fuel Tank Capacity | 23.8 gal. | 21.9 gal. |
Comfort & Convenience
| Feature | Mercedes-Benz | BMW |
|---|---|---|
| Push Button Start | ✓ | ✓ |
| Power Tilt and Telescopic Steering Wheel | ✓ | ✓ |
| Transmission Controls on Steering Wheel | ✓ | ✓ |
| Cruise Control on Steering Wheel | ✓ | ✓ |
| Audio Controls on Steering Wheel | ✓ | ✓ |
| Electric Power Steering | ✓ | ✓ |
| Front View Camera | ✓ | ✓ |
| Side View Camera | ✓ | ✓ |
| Rear View Camera | ✓ | ✓ |
| Front Parking Sensors | ✓ | ✓ |
| Rear Parking Sensors | ✓ | — |
| Automatic Parking Assist | ✓ | ✓ |
| Wireless Charging Pad | ✓ | ✓ |
| Adaptive Cruise Control | ✓ | — |
| Universal Remote Transmitter | ✓ | ✓ |
| Front Cupholders | ✓ | ✓ |
| Rear Cupholders | ✓ | ✓ |
| 3rd Row Cupholders | ✓ | — |
| Front Door Pockets | ✓ | ✓ |
| Rear Door Pockets | ✓ | ✓ |
| Overhead Console with Storage | ✓ | — |
| Front Seatback Storage | ✓ | ✓ |
| Power Rear Seat Easy Entry | ✓ | — |
| Leather Steering Wheel | ✓ | ✓ |
| Four Zone Climate Control | ✓ | ✓ |
| Rear Ventilation Ducts with Fan Control | ✓ | ✓ |
| Interior Air Filtration | ✓ | ✓ |
| Dual Vanity Mirrors | ✓ | ✓ |
| Auto-Dimming Rearview Mirror | ✓ | ✓ |
| Turn Signal Indicators in Mirrors | ✓ | ✓ |
| Rear Parking Sensors with Side Sensing | — | ✓ |
| Cruise Control | — | ✓ |
| Heated Steering Wheel | — | ✓ |
| Extended Cabin Heating/Cooling | — | ✓ |
In Car Entertainment
| Feature | Mercedes-Benz | BMW |
|---|---|---|
| Infotainment Display | 12.3 in | 14.9 in |
| AM/FM Stereo | ✓ | ✓ |
| Premium Speaker Brand | Burmester | Harman/Kardon |
| Stereo Power | 590W | 464W |
| Speaker System | 13 | 16 |
| Subwoofer Count | 2 | — |
| Surround Audio | Discrete | Discrete |
| Android Auto (Wireless) | ✓ | ✓ |
| Apple CarPlay (Wireless) | ✓ | ✓ |
| USB Port | ✓ | ✓ |
| USB Port with External Media Control | ✓ | ✓ |
| Satellite Radio | ✓ | ✓ |
| Satellite Radio Trial Period | 6 months | 12 months |
| Speed Sensitive Volume Control | ✓ | — |
| Auxiliary Audio Input | — | ✓ |
Power Feature
| Feature | Mercedes-Benz | BMW |
|---|---|---|
| One-Touch Power Windows | 4 | 4 |
| Moonroof Type | 1st Row Power Glass Extended | 1st Row Power Glass Extended |
| Keyless Entry | ✓ | ✓ |
| Reverse Tilt Passenger Mirror | ✓ | ✓ |
| Heated Mirrors | ✓ | ✓ |
Frontseats
| Feature | Mercedes-Benz | BMW |
|---|---|---|
| Front Head Room | 39.4 in. | 39.3 in. |
| Front Leg Room | 40.3 in. | 40.4 in. |
| Front Shoulder Room | 59.3 in. | 61.4 in. |
| Front Hip Room | 60.8 in. | — |
| Seat Material: Leatherette | ✓ | — |
| Front Seat Type: Bucket | ✓ | — |
| Driver Seat Power Adjustments | 10-way | 14-way |
| Driver Seat Height Adjustment | ✓ | ✓ |
| Driver Seat Lumbar Support | Power | Power |
| Driver Seat Thigh Extension | ✓ | ✓ |
| Driver Seat Memory Settings | 3 | 2 |
| Passenger Seat Power Adjustments | 10-way | 14-way |
| Passenger Seat Height Adjustment | ✓ | ✓ |
| Passenger Seat Lumbar Support | Power | Power |
| Passenger Seat Thigh Extension | ✓ | ✓ |
| Passenger Seat Memory Settings | 3 | 2 |
| Driver Seat Heating | Multi-level | Multi-level |
| Passenger Seat Heating | Multi-level | Multi-level |
| Driver Seat Ventilation | ✓ | — |
| Passenger Seat Ventilation | ✓ | — |
| Seat Material: Premium Leather | — | ✓ |
| Front Seat Type: Sport | — | ✓ |
Rearseats
| Feature | Mercedes-Benz | BMW |
|---|---|---|
| Rear Head Room | 40.2 in. | 37.5 in. |
| Rear Leg Room | 41.9 in. | 35.7 in. |
| Rear Shoulder Room | 58.5 in. | 60.7 in. |
| Rear Hip Room | 60.0 in. | — |
| Split-Folding Rear Seatback | ✓ | ✓ |
| Reclining Rear Seats | ✓ | — |
| Folding Center Armrest | ✓ | — |
| Power Folding Third Row Seat | ✓ | — |
| Folding Rear Seat Feature | — | ✓ |
| Pass-Thru Center Armrest | — | ✓ |
Tires and Wheels
| Feature | Mercedes-Benz | BMW |
|---|---|---|
| Wheel Material | Alloy | — |
| Wheel Size | 21 x 11.0 in. | 22 x 11.5 in. |
| Tire Type | All Season | Performance |
| Tire Size | 315/40R21 | 315/30R |
| Spare Tire Type | Temporary | Temporary |
| Spare Tire Location | Inside Mounted | Inside Mounted |
| Wheel Finish | — | Painted Alloy |
Suspension
| Feature | Mercedes-Benz | BMW |
|---|---|---|
| Four-Wheel Independent Suspension | ✓ | ✓ |
| Front Stabilizer Bar | ✓ | ✓ |
| Rear Stabilizer Bar | ✓ | ✓ |
Warranty
| Feature | Mercedes-Benz | BMW |
|---|---|---|
| Basic Warranty | 4 yr./ 50000 mi. | 4 yr./ 50000 mi. |
| Drivetrain Warranty | 4 yr./ 50000 mi. | 4 yr./ 50000 mi. |
| Hybrid Component Warranty | 6 yr./ 62000 mi. | — |
| Corrosion/Rust Warranty | 4 yr./ 50000 mi. | 12 yr./ unlimited mi. |
| Roadside Assistance | 4 yr./ 50000 mi. | 4 yr./ unlimited mi. |
| Complimentary Scheduled Maintenance | — | 3 yr./ 36000 mi. |
Frequently Asked Questions
Common questions about comparing the 2025 Mercedes-Benz GLS-Class and 2026 BMW X6 M.
How much more powerful is the 2026 BMW X6 M compared to the 2025 GLS?
The difference in performance is dramatic; the X6 M outputs a hefty 617 hp and 553 lb-ft of torque. This means the BMW has 242 more horsepower available than the 375 hp found in the standard GLS-Class.
Is the higher price of the BMW X6 M worth the added performance for everyday use?
For daily commuting, probably not, as the GLS-Class offers an AWD platform that achieves 21 combined MPG. You are paying a $45,400 premium for performance that might only be utilized occasionally, whereas the GLS maximizes efficiency.
Which vehicle is physically larger: the GLS or the X6 M?
The 2025 Mercedes-Benz GLS-Class is physically larger overall, measuring 205.0 inches in length and 71.8 inches in height. The X6 M is shorter and significantly lower, designed with a more raked, sporty profile.
Does the cargo capacity favor the larger GLS?
Surprisingly, no; despite being physically longer, the 2026 BMW X6 M has greater usable storage capacity with 27.4 cu ft compared to the GLS's 17.4 cu ft.
Are there fuel requirements that differ between these two luxury SUVs?
Both vehicles explicitly require premium unleaded fuel due to their high-output engines. However, the GLS manages better efficiency at 19/24 MPG city/highway, while the X6 M's power output suggests much lower mileage figures.
How does the transmission differ between the two competitors?
The 2025 GLS utilizes a smooth 9-speed shiftable automatic transmission focused on comfort and efficiency. In contrast, the X6 M uses a quicker-shifting 8-speed automatic, optimized for performance driving.
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