He set a new Hungarian national record over 400 metres at the 2023 World Athletics Championships in Budapest.

[1] Molnar runs for Ferencvaros,[2] he was part of the Hungarian 4x400m relay team at the 2022 European Athletics Championships.

Along with Tamás Máté, Dániel Huller, and Zoltán Wahl, he was part of the 4x400m indoor relay team that broke a 23-year-old national record, running 3:08.58 in February 2023.

[5] Molnar competed at the 2023 World Athletics Championships in Budapest and lowered his national record in the 400 metres to 44.84 to qualify for the semi-final.

[10] In June 2024, he qualified for the final of the 2024 European Athletics Championships – Men's 400 metres in Rome.