2026 Mercedes-Benz GLS Review: Specs, Performance, Range

The 2026 Mercedes-Benz GLS stands as the pinnacle of full-size luxury SUVs, blending commanding presence, advanced powertrains, and exceptional comfort for families and long-distance travelers. Building on its third-generation platform introduced in 2020 and refined in 2024, this model delivers subtle enhancements in performance and efficiency while maintaining its core appeal as a serene highway cruiser.

Power and Performance: Turbocharged Excellence

At the heart of the 2026 GLS lineup is the GLS450 4Matic, powered by a 3.0-liter turbocharged inline-six engine augmented by a 48V mild-hybrid system. This setup produces 375 horsepower and 369 lb-ft of torque, paired with a smooth nine-speed automatic transmission and standard all-wheel drive.

Acceleration figures impress for a vehicle of this size: the GLS450 reaches 60 mph in 5.4 to 5.5 seconds, with quarter-mile times around 13.9 to 14.1 seconds at 99-100 mph. Mid-range passing power shines, with 30-50 mph in 3.0 seconds and 50-70 mph in 4.0 seconds, even in Comfort mode. Higher trims like the GLS580 offer a twin-turbo V8 for even more thrust, improving to 15/20 mpg city/highway.

These specs position the GLS as a confident performer, prioritizing refined power delivery over raw aggression.

Driving Dynamics: Composed and Controlled

Despite its massive footprint—over 17 feet long—the GLS handles with poise. The air suspension (standard on higher trims) delivers a buttoned-down ride that soaks up imperfections while maintaining stability on highways and twisty roads. It feels planted when loaded, making it ideal for family road trips.

Steering is precise, providing a commanding view without the truck-like vagueness of some rivals. Transmission shifts are mostly seamless, though occasional hesitation under hard acceleration is noted. Overall, it excels in comfort and composure rather than sporty thrills.

• Strengths: Exceptional ride quality, stable at high speeds, confident cornering for its size.
• Areas for improvement: Transmission smoothness, third-row access.

Interior Luxury: Space Meets Opulence

The GLS cabin rivals the S-Class in refinement, with premium materials like leather, wood trim, and ambient lighting. Front seats offer heating, ventilation, and massage functions; optional captain’s chairs enhance second-row luxury. The dashboard features dual 12.3-inch screens powered by the MBUX infotainment system, supporting voice commands and augmented reality navigation.

Space is generous upfront and in the second row, accommodating adults comfortably. The third row, however, is tighter, better suited for children or occasional use. Cargo capacity starts at 17.4 cubic feet behind the third row, expanding to 84.7 with seats folded.

Manufaktur packages add bespoke touches like unique paints and woods, elevating personalization.

Technology and Safety: Cutting-Edge Features

Mercedes packs the GLS with advanced tech: adaptive cruise control, lane-keeping assist, blind-spot monitoring, and a 360-degree camera are standard. The updated MBUX includes over-the-air updates and fingerprint authentication for settings.

Fuel economy for the GLS450 hits 19 city/24 highway/21 combined mpg, offering around 500 miles of range—respectable for its class. The V8 variant sees gains to 15/20 mpg.

Pricing and Value: Premium Positioning

Base pricing for the GLS450 starts around $91,400, climbing to $96,400 as-tested with options like the Manufaktur package. AMG and Maybach variants push toward $150,000+. It competes with the BMW X7 and Cadillac Escalade, justifying its cost through superior refinement and warranty (4 years/50,000 miles).

Real-World Ownership Insights

Owners praise the GLS for dependability, safety, and surprising efficiency. It shines on long hauls, with a calm interior that minimizes fatigue. Consumer reviews highlight its quality build and cutting-edge design, though some note the third row’s limitations.

For families needing three-row versatility without compromise, the GLS delivers unmatched livability.

Pros and Cons at a Glance

Who Should Buy the 2026 GLS?

Ideal for buyers prioritizing luxury, space, and effortless long-distance travel. It’s less sporty than an X7 but more refined; less opulent than a Maybach but more practical. Test drive to experience its serene demeanor.

Frequently Asked Questions (FAQs)

What is the fuel economy of the 2026 Mercedes-Benz GLS450?

It achieves 19 mpg city, 24 mpg highway, and 21 mpg combined.

How fast is the GLS450 from 0-60 mph?

Around 5.4-5.5 seconds, with strong mid-range pull.

Is the third row comfortable for adults?

It’s adequate for shorter trips but tighter than rivals; best for kids.

What safety features does it include?

Standard adaptive cruise, lane assist, blind-spot monitoring, and more.

What’s the starting price?

Approximately $91,400 for the GLS450 4Matic.