Which first-party studio created 'Horizon Zero Dawn'?

The first-party studio that created Horizon Zero Dawn is Guerrilla Games.

Guerrilla Games is a Dutch developer based in Amsterdam and a member of Sony’s PlayStation Studios. Before Horizon, the studio was best known for the Killzone first-person shooter series, including Killzone 3 and Killzone: Shadow Fall.

Horizon Zero Dawn began development after Killzone 3, with Guerrilla looking for a new direction. Its pitch combined a lush post-apocalyptic world, robotic animals, and a red-haired hunter named Aloy. The game became Guerrilla’s first open-world role-playing game and its first major new intellectual property since Killzone.

Sony Interactive Entertainment published the game, but publishing and development are different roles. That distinction explains why Sony or PlayStation Studios may appear in some credits while Guerrilla Games is the correct answer for the studio that created it. The game launched for PlayStation 4 in 2017, followed by a Windows version in 2020.