When it comes to ranking the Hashira in the Demon Slayer Corps, it's important to clarify that the manga 'Kimetsu no Yaiba' itself doesn't present an official, static hierarchy numbered one through nine. The narrative focuses more on their individual strengths, specialties, and moments of heroism rather than a strict pecking order. That said, discussions among fans and analyses of their feats, particularly in the final arcs, do allow for some generally accepted power rankings based on their last known combat performances and narrative weight.
If we're talking about the end of the series, the strongest Hashira are often considered to be Gyomei Himejima, the Stone Hashira, and Sanemi Shinazugawa, the Wind Hashira. Gyomei is explicitly stated to be the most powerful Hashira of his generation, possessing immense physical strength and being the first to unlock the Transparent World and the red nichirin blade. Sanemi's incredible endurance, aggressive fighting style, and his own key role in the final battle place him right up there. Following them, you'd have Tengen Uzui, who retired earlier, and the likes of Muichiro Tokito and Mitsuri Kanroji, whose performances against the upper ranks were monumental.
However, reducing them to a simple list feels a bit against the spirit of the story. Each Hashira shines in their own domain—Shinobu Kocho's poison-based techniques, for instance, were uniquely vital against specific demons, even if she wasn't the strongest in direct combat. The ranking often shifts based on the context of the fight, the demon they're facing, and their personal growth. So, while a 'latest release' order might be Gyomei, Sanemi, Obanai, Giyu, Mitsuri, Muichiro, Shinobu, Tengen (retired), and Kyojuro (deceased), that's more of a fan consensus on combat prowess rather than a canonical leaderboard issued by the Corps. The beauty is in how they all contributed uniquely to the final victory, each essential in their own way.