2026 BMW X6 M vs 2026 Mercedes-Benz GLS

$134,600 · Crossover

$90,250 · Crossover

Comparison Overview

The most significant numerical divergence between the 2026 BMW X6 M and the 2026 Mercedes-Benz GLS is the $44,350 MSRP difference, with the BMW priced at $134,600 versus the Mercedes at $90,250. Performance specifications also show a massive gap; the X6 M generates 617 hp and 553 lb-ft of torque, dominating the GLS's 375 hp and 369 lb-ft of torque output. This power disparity is reflected in efficiency metrics, as the GLS offers a stated Combined MPG of 21, while the X6 M provides no equivalent metric, hinting at significantly higher consumption. Dimensionally, the GLS is longer at 205.0 inches compared to the X6 M's 194.8 inches, yet the X6 M surprisingly offers 10.0 cubic feet more cargo volume (27.4 cu ft vs. 17.4 cu ft). The X6 M utilizes an 8-speed automatic transmission, while the GLS employs a 9-speed unit.

Size Comparison

Performance

Fuel Efficiency

Full Specifications

Our Verdicts

🚗 Best for Commuters

2026 Mercedes-Benz GLS

The Mercedes-Benz GLS wins for commuters due to its superior fuel economy profile, achieving 21 Combined MPG.

👨‍👩‍👧‍👦 Best for Families

2026 Mercedes-Benz GLS

The GLS offers a more spacious and practical overall footprint, being 10.2 inches taller and featuring a significantly lower entry price.

🏎️ Best for Enthusiasts

2026 BMW X6 M

The 2026 BMW X6 M is the clear choice for performance enthusiasts, delivering an excess of 242 horsepower over the GLS.

💰 Best Value

2026 Mercedes-Benz GLS

The GLS provides AWD capability and substantial passenger/utility space for $44,350 less than the comparable BMW X6 M.

Choose the BMW X6 M if...

Absolute top-tier performance is mandatory, evidenced by its 617 hp engine.
A high-performance, driver-focused crossover is prioritized over passenger capacity.
Maximum dedicated cargo space of 27.4 cu ft is needed within a shorter 194.8-inch body length.

Choose the Mercedes-Benz GLS if...

Budget constraints favor the $90,250 MSRP, creating a $44,350 cost advantage over car 1.
Better overall efficiency is required, boasting a 21 Combined MPG rating.
Maximum vertical clearance and size are desired, as the GLS stands 71.8 inches tall.

Key Dimensions

Dimension	BMW X6 M	Mercedes-Benz GLS
Length	194.8"	205.0"
Width	79.5"	79.9"
Height	66.7"	71.8"
Wheelbase	117.0"	123.4"

Features Comparison

Safety

Feature	BMW	Mercedes-Benz
Blind Spot Monitor	✓	✓
Lane Departure Warning	✓	✓
Lane Keeping Assist System	✓	✓
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	✓	✓
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	✓	✓
Self-Leveling Headlights	✓	—
Daytime Running 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	✓	✓
Front Cross Traffic Alert	—	✓
Third Row Head Airbags	—	✓
Cornering Lights	—	✓

Engine

Feature	BMW	Mercedes-Benz
Base Engine Displacement	4.4 L	3.0 L
Number of Cylinders	V8	inline 6
Base Engine Type	mild hybrid	mild hybrid
Horsepower	617 hp @ 6000 rpm	375 hp @ 5800 rpm
Torque	553 lb-ft @ 1800 rpm	369 lb-ft @ 1800 rpm
Number of Valves	32	24
Camshaft Type	Double overhead cam (DOHC)	Double overhead cam (DOHC)
Variable Valve Timing	Variable	Variable
Fuel Injection Type	✓	✓

Drive Train

Feature	BMW	Mercedes-Benz
Transmission Type	8-speed shiftable automatic	9-speed shiftable automatic
Drivetrain Type	all wheel drive	all wheel drive
[object Object]	✓	—
[object Object]	✓	—
Hill Descent Control	✓	✓
Center Differential Type	—	Limited Slip

Fuel

Feature	BMW	Mercedes-Benz
Fuel Type	premium unleaded (required)	premium unleaded (required)
EPA Driving Range (City/Highway)	0/0 mi.	452.2/571.2 mi.
Fuel Tank Capacity	21.9 gal.	23.8 gal.
EPA Fuel Economy (City/Highway)	—	19/24 MPG
EPA Fuel Economy (Combined)	—	21 MPG

Comfort & Convenience

Feature	BMW	Mercedes-Benz
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 with Side Sensing	✓	—
Automatic Parking Assist	✓	✓
Wireless Charging Pad	✓	✓
Cruise Control	✓	—
Universal Remote Transmitter	✓	✓
Front Cupholders	✓	✓
Rear Cupholders	✓	✓
Front Door Pockets	✓	✓
Rear Door Pockets	✓	✓
Front Seatback Storage	✓	✓
Leather Steering Wheel	✓	✓
Heated Steering Wheel	✓	—
Four Zone Climate Control	✓	✓
Rear Ventilation Ducts with Fan Control	✓	✓
Interior Air Filtration	✓	✓
Extended Cabin Heating/Cooling	✓	—
Dual Vanity Mirrors	✓	✓
Auto-Dimming Rearview Mirror	✓	✓
Turn Signal Indicators in Mirrors	✓	✓
Rear Parking Sensors	—	✓
Adaptive Cruise Control	—	✓
3rd Row Cupholders	—	✓
Overhead Console with Storage	—	✓
Power Rear Seat Easy Entry	—	✓

In Car Entertainment

Feature	BMW	Mercedes-Benz
Infotainment Display	14.9 in	12.3 in
AM/FM Stereo	✓	✓
Premium Speaker Brand	Harman/Kardon	Burmester
Stereo Power	464W	590W
Speaker System	16	13
Surround Audio	Discrete	Discrete
Android Auto (Wireless)	✓	✓
Apple CarPlay (Wireless)	✓	✓
USB Port	✓	✓
Auxiliary Audio Input	✓	—
USB Port with External Media Control	✓	✓
Satellite Radio	✓	✓
Satellite Radio Trial Period	12 months	6 months
Subwoofer Count	—	2
Speed Sensitive Volume Control	—	✓

Power Feature

Feature	BMW	Mercedes-Benz
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	BMW	Mercedes-Benz
Front Head Room	39.3 in.	39.4 in.
Front Leg Room	40.4 in.	40.3 in.
Front Shoulder Room	61.4 in.	59.3 in.
Seat Material: Premium Leather	✓	—
Front Seat Type: Sport	✓	—
Driver Seat Power Adjustments	14-way	10-way
Driver Seat Height Adjustment	✓	✓
Driver Seat Lumbar Support	Power	Power
Driver Seat Thigh Extension	✓	✓
Driver Seat Memory Settings	2	3
Passenger Seat Power Adjustments	14-way	10-way
Passenger Seat Height Adjustment	✓	✓
Passenger Seat Lumbar Support	Power	Power
Passenger Seat Thigh Extension	✓	✓
Passenger Seat Memory Settings	2	3
Driver Seat Heating	Multi-level	Multi-level
Passenger Seat Heating	Multi-level	Multi-level
Front Hip Room	—	60.8 in.
Seat Material: Leatherette	—	✓
Front Seat Type: Bucket	—	✓
Driver Seat Ventilation	—	✓
Passenger Seat Ventilation	—	✓

Rearseats

Feature	BMW	Mercedes-Benz
Rear Head Room	37.5 in.	40.2 in.
Rear Leg Room	35.7 in.	41.9 in.
Rear Shoulder Room	60.7 in.	58.5 in.
Split-Folding Rear Seatback	✓	✓
Folding Rear Seat Feature	✓	—
Pass-Thru Center Armrest	✓	—
Rear Hip Room	—	60.0 in.
Reclining Rear Seats	—	✓
Folding Center Armrest	—	✓
Power Folding Third Row Seat	—	✓

Tires and Wheels

Feature	BMW	Mercedes-Benz
Wheel Finish	Painted Alloy	—
Wheel Size	22 x 11.5 in.	21 x 11.0 in.
Tire Type	Performance	All Season
Tire Size	315/30R	315/40R21
Spare Tire Type	Temporary	Temporary
Spare Tire Location	Inside Mounted	Inside Mounted
Wheel Material	—	Alloy

Suspension

Feature	BMW	Mercedes-Benz
Four-Wheel Independent Suspension	✓	✓
Front Stabilizer Bar	✓	✓
Rear Stabilizer Bar	✓	✓

Warranty

Feature	BMW	Mercedes-Benz
Basic Warranty	4 yr./ 50000 mi.	4 yr./ 50000 mi.
Drivetrain Warranty	4 yr./ 50000 mi.	4 yr./ 50000 mi.
Corrosion/Rust Warranty	12 yr./ unlimited mi.	4 yr./ 50000 mi.
Roadside Assistance	4 yr./ unlimited mi.	4 yr./ 50000 mi.
Complimentary Scheduled Maintenance	3 yr./ 36000 mi.	—
Hybrid Component Warranty	—	6 yr./ 62000 mi.

Frequently Asked Questions

Common questions about comparing the 2026 BMW X6 M and 2026 Mercedes-Benz GLS.

What is the primary powertrain difference between the 2026 BMW X6 M and the Mercedes-Benz GLS?

The BMW X6 M possesses a substantially more powerful setup, delivering 617 horsepower and 553 lb-ft of torque. Conversely, the Mercedes-Benz GLS produces 375 horsepower and 369 lb-ft of torque, resulting in a 242 hp deficit.

How does the fuel efficiency compare between these two luxury crossovers?

The Mercedes-Benz GLS is rated at 21 Combined MPG (19 City/24 Highway), utilizing premium fuel. Specific MPG figures for the high-performance BMW X6 M were not provided, implying significantly lower efficiency given its power output.

Which vehicle offers more usable interior cargo space?

Despite being physically shorter in length (194.8 in vs. 205.0 in for the GLS), the BMW X6 M accommodates 27.4 cubic feet of cargo. The larger Mercedes-Benz GLS offers a smaller 17.4 cubic feet of cargo capacity.

Is the gearbox transmission performance a deciding factor?

The transmissions are different; the X6 M uses an 8-speed shiftable automatic, optimized for rapid performance delivery. The GLS utilizes a 9-speed shiftable automatic, which typically aids in achieving better highway fuel economy.

How significant is the price difference when considering base MSRPs?

The financial gap is substantial: the 2026 BMW X6 M starts at $134,600, whereas the 2026 Mercedes-Benz GLS is priced at $90,250, creating a $44,350 barrier to entry for the BMW.

Which vehicle is physically larger externally?

The Mercedes-Benz GLS is physically larger overall, measuring 205.0 inches long and 71.8 inches high. The BMW X6 M is narrower by 0.4 inches (79.5 in vs 79.9 in), but notably shorter.