The new A-Class range will start from £31,880 while the B-Class line-up is priced from £35,100.
The A-Class features a range of engine variants including both petrol and diesel options, while a plug-in hybrid will be joining the line-up as an A 250 hatch and saloon.
For the new B-Class, the engine choice is either a B 200 d or B 200 with all powertrain technology the same across both models.
Depending on the engine, the two models are available either with 7 or 8-speed automatic transmissions.
Five model lines are available with the range comprising Sport Executive, AMG Line Executive, AMG Line Premium, AMG Line Premium Plus, and a new Exclusive Launch Edition.
Exterior design include LED headlamps and LED rear lights, as well as all models now featuring adaptive high beam assist as standard.
Multibeam LED headlights are standard on the Premium Plus model, as is a head-up display for the driver and a 360-degree camera system.
All models now feature the MBUX connectivity system, which includes advanced voice control.
Petrol models are powered by a 1.3-litre engine developing either 134bhp or 161bhp, while the diesels have a 2.0-litre 148bhp engine.
Fuel economy is said to be around 55mpg for the petrol versions, while the diesel is more frugal at almost 58mpg. Emissions range from 128g/km to 145g/km.
Meanwhile, the latest AMG A 45 will be priced from £63,140 with an A 35 hatch also available from £45,930.
The A 45 has a 0 to 62mph acceleration time of 3.9 seconds and a top speed of almost 170mph while the A35 – which develops 302bhp - has a sprint time of 4.7 seconds and tops out at 155mph.
Official economy figures are 34.8mpg for the A 35 with emissions as low as 184g/km, while the A 45 is rated at 32mpg with a CO2 figure of 200g/km.
Prices correct as of 31/10/22 and are subject to change.