Gemix kept the French Champion Hurdle on home soil when taking the Grande Course de Haies d'Auteuil at the Paris track.
The five-year-old made just about all the running over to beat off a strong challenge from Ireland and Britain.
The Nicolas Bertran de Balanda-trained entire pulled out all the stops for jockey David Cottin and the 8-1 shot swept to victory from the Charles Byrnes-trained Solwhit, the 5-4 favourite.
Zaidpour (22-1), from the Willie Mullins stable, put in his best work at the finish to claim third place, with the Paul Nicholls-trained Celestial Halo not too far away.
Mullins' Thousand Stars, winner of this race for the last two years, could never strike a blow, while the Nick Williams-trained Reve De Sivola faded tamely in the straight after showing up well for most of the Grade One contest.