Well, a bomb, at least.
Actually, he may not even have that, since he just set it off, but he could make more if he wanted. And don't you forget it.
China described the test as "brazen", which might qualify as the understatement of the year. Unwilling to be outdone in Strategic Intercontinental Understatements, the US said that an NK nuke test would be a "provocative act". Off the record, a US DoD source said "We've been telling you and telling you, so don't even pretend to act surprised."
Publically, the South Korean president wanted the world to know that the ROK would "react sternly and calmly". Privately, I doubt he was all that calm.
More as the story develops...