No Stuntman for Keanu
As you may recall from the first film, Neo had a phone sent to him at his office. Morpheus was the one on the other end giving him all the instructions he needed to escape. Included was his need to scale the building.
Source: cinevenger
But if you think he used a stuntman for that scene, you’re mistaken, my friend. Keanu Reeves really climbed out of the window. That window? It was on the 34th floor. So yeah, Reeves is bada$$, and he’s one of the few actors that do their own stunts.