It disappoints me that this is a 26-episode series. But I guess with her already performing up there with a top 3 claymore and killing a 4th or 5th one then there's no way it could be much longer.
No way anyone could make Ailcia even sweat...except Raki he pwns. Claymore actually has more manga being released in Japan right now so I am sure it won't end until about 51 at the least.
The anime adaptation of the manga began airing on Nippon Television on April 3, 2007. It is planned to run for 26 episodes. It, thus far, faithfully follows the manga.
I'm hoping the wikipedia page is wrong about the total number of episodes.