

Operation: Champions was a temporary event in Halo Infinite that emphasized gladiator-themed customization for Spartans. It introduced a 20-level free Operation Pass that featured the Athlon armor core, first introduced in Halo 5: Guardians. The pass offered armor components, coatings, and other cosmetic items with an arena battle motif. Additional themed packages were also available for purchase in the in-game store.
| PC | September 3, 2024 |
| XONE | September 3, 2024 |
| Series X|S | September 3, 2024 |