Beniers represented the United States at the 2019 IIHF World U18 Championships, where he recorded two goals in seven games and won a bronze medal. Beniers represented the United States at the 2021 World Junior Ice Hockey Championships, where he was the youngest player on the roster, scoring one goal and two assists and averaging 17:05 of ice time in seven games as a second-line center, helping the United States win gold. Beniers represented the United States at the 2021 IIHF World Championship, where he was the only draft-eligible player on team USA and won a bronze medal. He became the fifth Wolverine to represent their country at both the World Junior and World Championship in the same season, following Jack Johnson (2007), Jacob Trouba (2013), Dylan Larkin (2015) and Quinn Hughes (2018 and 2019).