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Mercedes GLB vs smart #5 - Differences and prices compared

Compare performance (320 HP vs 646 HP), boot space and price (40500 £ vs 39300 £) at a glance. Find out which car is the better choice for you – Mercedes GLB or smart #5?

Mercedes GLB

smart #5

5 (3 Reviews)
rate

You can find all user reviews further down on this page.

Here’s where it gets real: The technical differences in detail

GLB @ Mercedes-Benz Group Media

Costs and Efficiency:

Price and efficiency are key factors when choosing a car – and this is often where the real differences emerge.

smart #5 has a minimal advantage in terms of price – it starts at 39300 £, while the Mercedes GLB costs 40500 £. That’s a price difference of around 1167 £.

GLB @ Mercedes-Benz Group Media

Engine and Performance:

Power, torque and acceleration say a lot about how a car feels on the road. This is where you see which model delivers more driving dynamics.

When it comes to engine power, the smart #5 has a convincingly edge – offering 646 HP compared to 320 HP. That’s roughly 326 HP more horsepower.

In acceleration from 0 to 100 km/h, the smart #5 is convincingly quicker – completing the sprint in 3.80 s, while the Mercedes GLB takes 5.50 s. That’s about 1.70 s faster.

In terms of top speed, the Mercedes GLB performs a bit better – reaching 250 km/h, while the smart #5 tops out at 210 km/h. The difference is around 40 km/h.

There’s also a difference in torque: smart #5 pulls decisively stronger with 710 Nm compared to 400 Nm. That’s about 310 Nm difference.

GLB @ Mercedes-Benz Group Media

Space and Everyday Use:

Beyond pure performance, interior space and usability matter most in daily life. This is where you see which car is more practical and versatile.

Seats: offers more seating capacity – vs .

In curb weight, Mercedes GLB is noticeable lighter – 1640 kg compared to 2200 kg. The difference is around 560 kg.

In terms of boot space, the smart #5 offers slight more room – 630 L compared to 570 L. That’s a difference of about 60 L.

In maximum load capacity, the Mercedes GLB performs slightly better – up to 1805 L, which is about 275 L more than the smart #5.

When it comes to payload, smart #5 slight takes the win – 502 kg compared to 500 kg. That’s a difference of about 2 kg.

Who comes out on top?

Overall, the smart #5 shows itself to be dominates this comparison and secures the title of DriveDuel Champion.
It convinces with the more balanced overall package and proves to be the more versatile choice for everyday use.

from about £39,300
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smart #5

  • Engine Type : Electric
  • Transmission : Automatic
  • Drive Type : Rear-Wheel Drive, All-Wheel Drive
  • Power HP : 340 - 646 HP
  • Consumption kWh/100km : 18.4 - 19.9 kWh
  • Electric Range : 465 - 590 km
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Mercedes GLB
smart #5

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Mercedes GLB

The Mercedes GLB is a practical compact SUV that mixes boxy, family-friendly space with premium German polish, making it an appealing choice for buyers who want usefulness without pretension. It drives with a confident, composed feel and somehow manages to look both rugged and refined — the grown-up SUV that still likes to have fun.

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smart #5

5 (3 Reviews)
rate

The Smart #5 continues to build on the brand's legacy of compact and efficient urban vehicles, now infused with a more modern and stylish design. Its sleek appearance is complemented by a spacious interior, offering comfort without compromising its compact nature. This model is ideal for city dwellers seeking a blend of innovation, practicality, and style in their daily drives.

details

Reviews Mercedes GLB

Reviews smart #5

5 (3 Reviews)
rate
Stefan
4 Dec 2025, 21:11:24

Bis auf das noch hoffentlich bald verbesserte/reduzierte Gebimmel und die gruselig schlecht zu erreichende Stummschaltung der Geschwindigkeitswarnung ist das Auto wirklich der Hammer!
Sehr, sehr leise, komfortabel, extrem schnell (Brabus Version), tolle Verarbeitung, tolle Ausstattung!

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Costs and Consumption
Price
40500 - 65300 £
Price
39300 - 52200 £
Consumption L/100km
5.6 - 9 L
Consumption L/100km
-
Consumption kWh/100km
-
Consumption kWh/100km
18.4 - 19.9 kWh
Electric Range
-
Electric Range
465 - 590 km
Battery Capacity
-
Battery Capacity
74.4 - 94 kWh
co2
146 - 204 g/km
co2
0 g/km
Fuel tank capacity
52 - 60 L
Fuel tank capacity
-

Dimensions and Body
Body Type
SUV
Body Type
SUV
Seats
5
Seats
5
Doors
5
Doors
5
Curb weight
1640 - 1820 kg
Curb weight
2200 - 2378 kg
Trunk capacity
565 - 570 L
Trunk capacity
630 L
Length
4634 - 4650 mm
Length
4695 mm
Width
1834 - 1850 mm
Width
1920 mm
Height
1665 - 1692 mm
Height
1705 mm
Max trunk capacity
1800 - 1805 L
Max trunk capacity
1530 L
Payload
500 kg
Payload
475 - 502 kg

Engine and Performance
Engine Type
Petrol MHEV, Diesel
Engine Type
Electric
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Dual-Clutch Automatic
Transmission Detail
Reduction Gearbox
Drive Type
Front-Wheel Drive, All-Wheel Drive
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Power HP
116 - 320 HP
Power HP
340 - 646 HP
Acceleration 0-100km/h
5.5 - 11.5 s
Acceleration 0-100km/h
3.8 - 6.9 s
Max Speed
188 - 250 km/h
Max Speed
200 - 210 km/h
Torque
230 - 400 Nm
Torque
373 - 710 Nm
Number of Cylinders
4
Number of Cylinders
-
Power kW
85 - 235 kW
Power kW
250 - 475 kW
Engine capacity
1332 - 1991 cm3
Engine capacity
-

General
Model Year
2025
Model Year
2025
CO2 Efficiency Class
E, F, G
CO2 Efficiency Class
A
Brand
Mercedes-Benz
Brand
smart

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What drivetrain options does the Mercedes GLB have?

Available configurations include Front-Wheel Drive or All-Wheel Drive.

The prices and data displayed are estimates based on German list prices and may vary by country. This information is not legally binding.