2025 Porsche Cayenne Coupe vs 2026 Mercedes-Benz GLS

$89,800 · Crossover

$90,250 · Crossover

Comparison Overview

The 2025 Porsche Cayenne Coupe electrifies the segment with pure sports-car DNA wrapped in an aggressive shell, boasting 348 hp and a nimble 194.0-inch length, promising razor-sharp dynamics. Conversely, the 2026 Mercedes-Benz GLS enters as the bastion of luxury and space, offering a robust 375 hp from its larger frame, which measures 205.0 inches long. While the Mercedes edges out the Porsche in efficiency, delivering 21 combined MPG versus the Cayenne’s 19 combined MPG, the Stuttgart machine prioritizes driver engagement. The GLS provides a more practical package, even if its cargo capacity shrinks to 17.4 cu ft with seating expanded, whereas the Porsche maximizes cargo space at 20.9 cu ft despite its sportier roofline. Both demand premium fuel, but the dynamic experience offered by each—one focused on agility, the other on imposing presence—sets them worlds apart.

Size Comparison

Performance

Fuel Efficiency

Full Specifications

Our Verdicts

🚗 Best for Commuters

2026 Mercedes-Benz GLS

The 2026 Mercedes-Benz GLS offers superior fuel economy at 21 combined MPG compared to the Cayenne Coupe's 19 MPG.

👨‍👩‍👧‍👦 Best for Families

2026 Mercedes-Benz GLS

The Mercedes-Benz GLS is significantly larger overall, with a height of 71.8 inches providing more inherent cabin volume than the Cayenne Coupe.

🏎️ Best for Enthusiasts

2025 Porsche Cayenne Coupe

Despite having 348 hp versus the GLS's 375 hp, the Porsche Cayenne Coupe’s inherently sportier chassis tuning is better suited for enthusiast driving dynamics.

💰 Best Value

2025 Porsche Cayenne Coupe

The Porsche undercuts the Mercedes-Benz by $450 in starting MSRP, offering a high-end performance experience for a slightly lower entry price.

Choose the Porsche Cayenne Coupe if...

You prioritize a more compact, agile footprint, measuring only 194.0 inches long.
You need maximum utility from a performance SUV, offering 20.9 cu ft of standard cargo space.
You prefer the established, driver-focused dynamics of a Porsche, even if it means sacrificing 27 horsepower.

Choose the Mercedes-Benz GLS if...

Maximum horsepower is crucial, as the GLS delivers 375 hp compared to the Cayenne's 348 hp.
You need slightly better running costs, achieving 24 highway MPG versus the Cayenne’s 23 highway MPG.
You require a substantially larger vehicle, evidenced by its 205.0-inch length and 71.8-inch height.

Key Dimensions

Dimension	Porsche Cayenne Coupe	Mercedes-Benz GLS
Length	194.0"	205.0"
Width	78.1"	79.9"
Height	66.1"	71.8"
Wheelbase	114.0"	123.4"

Features Comparison

Safety

Feature	Porsche	Mercedes-Benz
Blind Spot Monitor	✓	✓
Lane Departure Warning	✓	✓
Lane Keeping Assist System	✓	✓
Rear Cross Traffic Alert	✓	✓
Pre-Collision Safety System	✓	✓
Post-Collision Safety System	✓	✓
Dual Front Side-Mounted Airbags	✓	✓
Dual Rear 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
Front Ventilated Disc Brakes	✓	✓
Rear Ventilated Disc Brakes	✓	✓
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 Integrated Headrests	✓	—
Rear Headrests	2	3
Rear Height Adjustable Headrests	✓	✓
Anti-Theft Alarm System (Remote)	✓	✓
Engine Immobilizer	✓	✓
Front Cross Traffic Alert	—	✓
Driver Attention Alert	—	✓
Third Row Head Airbags	—	✓
Brake Drying	—	✓
Brake Preparation System	—	✓
Front Power Adjustable Headrests	—	✓
Rear Center 3-Point Seatbelt	—	✓

Engine

Feature	Porsche	Mercedes-Benz
Base Engine Displacement	3.0 L	3.0 L
Number of Cylinders	V6	inline 6
Base Engine Type	gas	mild hybrid
Horsepower	348 hp @ 5400 rpm	375 hp @ 5800 rpm
Torque	368 lb-ft @ 1450 rpm	369 lb-ft @ 1800 rpm
Number of Valves	24	24
Camshaft Type	Double overhead cam (DOHC)	Double overhead cam (DOHC)
Variable Valve Timing	Variable	Variable
Fuel Injection Type	✓	✓

Drive Train

Feature	Porsche	Mercedes-Benz
Transmission Type	8-speed shiftable automatic	9-speed shiftable automatic
Drivetrain Type	all wheel drive	all wheel drive
Center Differential Type	Limited Slip	Limited Slip
Hill Descent Control	✓	✓

Fuel

Feature	Porsche	Mercedes-Benz
Fuel Type	premium unleaded (required)	premium unleaded (required)
EPA Fuel Economy (City/Highway)	17/23 MPG	19/24 MPG
EPA Fuel Economy (Combined)	19 MPG	21 MPG
EPA Driving Range (City/Highway)	402.9/545.1 mi.	452.2/571.2 mi.
Fuel Tank Capacity	23.7 gal.	23.8 gal.

Comfort & Convenience

Feature	Porsche	Mercedes-Benz
Push Button Start	✓	✓
Power Tilt and Telescopic Steering Wheel	✓	✓
Transmission Controls 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	✓	✓
Cruise Control	✓	—
Universal Remote Transmitter	✓	✓
Front Cupholders	✓	✓
Rear Cupholders	✓	✓
Front Door Pockets	✓	✓
Rear Door Pockets	✓	✓
Front Seatback Storage	✓	✓
Leather Steering Wheel	✓	✓
Dual Zone Climate Control	✓	—
Rear Ventilation Ducts	✓	—
Interior Air Filtration	✓	✓
Dual Vanity Mirrors	✓	✓
Auto-Dimming Rearview Mirror	✓	✓
Turn Signal Indicators in Mirrors	✓	✓
Cooled Storage Compartment	✓	—
Cruise Control on Steering Wheel	—	✓
Adaptive Cruise Control	—	✓
3rd Row Cupholders	—	✓
Overhead Console with Storage	—	✓
Power Rear Seat Easy Entry	—	✓
Four Zone Climate Control	—	✓
Rear Ventilation Ducts with Fan Control	—	✓

In Car Entertainment

Feature	Porsche	Mercedes-Benz
AM/FM Stereo	✓	✓
Stereo Power	150W	590W
Speaker System	10	13
Android Auto (Wired)	✓	—
Apple CarPlay (Wired)	✓	—
USB Port	✓	✓
Auxiliary Audio Input	✓	—
Satellite Radio	✓	✓
Satellite Radio Trial Period	3 months	6 months
Infotainment Display	—	12.3 in
Premium Speaker Brand	—	Burmester
Subwoofer Count	—	2
Surround Audio	—	Discrete
Android Auto (Wireless)	—	✓
Apple CarPlay (Wireless)	—	✓
USB Port with External Media Control	—	✓
Speed Sensitive Volume Control	—	✓

Power Feature

Feature	Porsche	Mercedes-Benz
One-Touch Power Windows	4	4
Moonroof Type	1st Row Fixed Glass Extended	1st Row Power Glass Extended
Keyless Entry	✓	✓
Heated Mirrors	✓	✓
Reverse Tilt Passenger Mirror	—	✓

Frontseats

Feature	Porsche	Mercedes-Benz
Seat Material: Leather	✓	—
Front Seat Type: Sport	✓	—
Driver Seat Power Adjustments	8-way	10-way
Driver Seat Height Adjustment	✓	✓
Driver Seat Memory Settings	3	3
Passenger Seat Power Adjustments	8-way	10-way
Passenger Seat Height Adjustment	✓	✓
Driver Seat Heating	Multi-level	Multi-level
Passenger Seat Heating	Multi-level	Multi-level
Front Head Room	—	39.4 in.
Front Leg Room	—	40.3 in.
Front Shoulder Room	—	59.3 in.
Front Hip Room	—	60.8 in.
Seat Material: Leatherette	—	✓
Front Seat Type: Bucket	—	✓
Driver Seat Lumbar Support	—	Power
Driver Seat Thigh Extension	—	✓
Passenger Seat Lumbar Support	—	Power
Passenger Seat Thigh Extension	—	✓
Passenger Seat Memory Settings	—	3
Driver Seat Ventilation	—	✓
Passenger Seat Ventilation	—	✓

Rearseats

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

Tires and Wheels

Feature	Porsche	Mercedes-Benz
Wheel Material	Alloy	Alloy
Wheel Size	20 x 10.5 in.	21 x 11.0 in.
Tire Type	All Season	All Season
Tire Size	295/45R20	315/40R21
Spare Tire Type	Temporary	Temporary
Spare Tire Location	Inside Mounted	Inside Mounted

Suspension

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

Warranty

Feature	Porsche	Mercedes-Benz
Basic Warranty	4 yr./ 50000 mi.	4 yr./ 50000 mi.
Drivetrain Warranty	4 yr./ 50000 mi.	4 yr./ 50000 mi.
EV Battery Warranty	8 yr./ 100000 mi.	—
Corrosion/Rust Warranty	12 yr./ unlimited mi.	4 yr./ 50000 mi.
Roadside Assistance	4 yr./ 50000 mi.	4 yr./ 50000 mi.
Hybrid Component Warranty	—	6 yr./ 62000 mi.

Frequently Asked Questions

Common questions about comparing the 2025 Porsche Cayenne Coupe and 2026 Mercedes-Benz GLS.

Which vehicle offers better fuel economy for daily driving?

The 2026 Mercedes-Benz GLS holds a slight advantage, reporting 21 combined MPG, compared to the 2025 Porsche Cayenne Coupe's 19 combined MPG. This marginal difference translates to fewer stops at the premium unleaded pump over the course of a year.

How does cargo capacity compare between the two SUVs?

The Porsche Cayenne Coupe is more practical for luggage, offering 20.9 cubic feet of cargo space. In contrast, the larger Mercedes-Benz GLS provides only 17.4 cubic feet in its standard configuration.

Is the horsepower difference noticeable between the two models?

The 2026 GLS leads the comparison with 375 hp, while the 2025 Cayenne Coupe produces 348 hp, a gap of 27 horsepower. While the GLS is technically more powerful, the Porsche's lighter, more focused platform may negate this gap in real-world acceleration feel.

Which vehicle has a lower starting price?

The 2025 Porsche Cayenne Coupe is the more accessible entry point at an MSRP of $89,800. The 2026 Mercedes-Benz GLS starts slightly higher at $90,250.

How does the transmission differ?

The Porsche utilizes an 8-speed shiftable automatic transmission, which is tuned for immediate response. The Mercedes-Benz GLS upgrades to a 9-speed shiftable automatic, which typically aids in smoother highway cruising and better economy.

Are these vehicles similar in physical size?

No, they differ significantly in scale; the GLS is over 11 inches longer (205.0 inches vs. 194.0 inches) and substantially taller, giving the Mercedes a much more commanding road presence.