The Deus Ex Machina is the central interface and ruling leader of Machine City. "Deus Ex Machina" means "god from a machine" and is a contrived plot device where an unexpected power or event saves a seemingly hopeless situation.

Neo convinces the Deus that the rogue Smith is a virus that wants to conquer both the Matrix and the real world. In the Matrix, Smith assimilates Neo and the Deus sends a surge of energy into Neo's body in the real world, causing the Neo/Smith clone and all the other Smith clones in the Matrix to be destroyed, deleting Agent Smith permanently.

Many of the "raindrops" in the final fight between Neo and Smith are actually single lines of Matrix code. This subtle effect was added to imply that the Matrix was beginning to destabilize.

The Matrix Revolutions ends with a tentative peace established between the humans and the machines. When asked by the Architect whether or not the peace will last, the Oracle responds "for as long as it can".

The film won all four of the awards it was nominated for: Best Visual Effects, Best Sound Mixing, Best Sound Editing and Best Film Editing.