[1] In 2019 he drove in both the Italian and Spanish F4 championships, for Jenzer Motorsport and G4 Racing respectively.

[2][3] He had a successful campaign in the Spanish series, where he finished on the podium twice and ended his season sixth in the drivers' standings.

In February 2021 it was announced that Gnos would be competing in the Formula Regional European Championship with G4 Racing.

For the 2022 season, the Swiss driver remained with his father's team, G4, this time partnering Matías Zagazeta and Owen Tangavelou.

(key) (Races in bold indicate pole position; results in italics indicate fastest lap) * Season still in progress.