The A 45 AMG is a performance version of the A-Class, fitted with a 2.0-litre four-cylinder turbo engine rated 360 PS (265 kW; 355 hp)@6000rpm and 450 N·m (332 lbf·ft)@2250-5000rpm, AMG Speedshift DCT 7-speed sports transmission with Momentary M mode, 4MATIC all-wheel drive, 3-stage ESP with ESP Curve Dynamic Assist and "ESP Sport Handling" mode, AMG sports suspension with independently developed front and rear axles, high-performance braking system with 350 x 32 millimetres front brake discs and 330 x 22 millimetres rear brake discs, and is identifiable by the "twin blade" radiator grille, AMG light-alloy wheels in twin-spoke design and two square chrome-plated tailpipes.

The vehicle was originally announced to be unveiled in first quarter of 2013,and was later unveiled in Geneva Motor Show. Sales release date was set to 8 April 2013, with Germany market launch beginning in June 2013.