He helped Switzerland to eighth position in that season's Motocross des Nations, stepping up to the 450 to race in the MXGP class.

These performances were enough for Guillod to be signed for a full-time ride in the MX2 class of the 2014 FIM Motocross World Championship with Standing Construct KTM.

In an opening part of the season dominated by Jeffrey Herlings, Guillod managed to outright beat the Dutchman in race two in Great Britain.

At that season's Motocross des Nations, Guillod again rode in the MXGP class and formed part of the Swiss team who finished fifth.

Despite racing outside of the FIM World Championship, Guillod represented Switzerland for the eighth time at the 2019 Motocross des Nations.

2021 would see Guillod join the new Swiss-based Hostettler Yamaha squad, competing in MXGP as well as both the MX Open and MX2 classes of the Swiss Motocross Championship.

[14] Dominating both Swiss Championship classes, Guillod also competed at the 2021 Motocross des Nations, recording his highest ever individual overall.

[15] He continued to show the improvements from the previous season, posting consistent top-10 finishes in MXGP for ninth in the final standings and winning the 2023 French Elite Motocross Championship.

In the 2024 FIM Motocross World Championship, he was able to repeat his ninth place overall in the MXGP class, with a highest finish of fifth overall at the second Indonesian round.