No, Halo 4 does not require an Xbox Live Silver subscription to play online multiplayer. However, an Xbox Live Gold subscription is needed to access certain online features and game modes.
What about halo 3 odst
In contrast to Halo 4, Halo 3: ODST does require an Xbox Live Gold subscription to play online multiplayer. This includes accessing the game's cooperative Firefight mode or any other online features.
