049 Abject Testament is a Forerunner monitor created to maintain Halo Installation 03 (Gamma Halo).
Black-Box is a fourth-generation AI construct used to monitor affairs at the highest levels of human government for Serin Osman, head of ONI.
Cortana was an artificial intelligence created by humanity and eventually paired with the Master Chief in a final effort to end the Covenant War.
Tasked with maintaining the mysterious world of Genesis, 031 Exuberant Witness aided Spartans against the inexorable rise of Cortana.
343 Guilty Spark is a Forerunner monitor created during the final days of the Flood War in order to maintain Halo Installation 04 (Alpha Halo).
The artificial intelligence known as Governor Sloan served as an elected official for Meridian Station and was integral to leading both Blue Team and Osiris to the subterranean Guardian.
Iona was a smart artificial intelligence created specifically for operational analysis by ONI.
One of the most powerful Forerunner AI ever made, Mendicant Bias was turned against his creators by Gravemind.
2401 Penitent Tangent is a Forerunner monitor created during the final days of the Flood War in order to maintain Halo Installation 05 (Delta Halo).