The assailant used an explosives-rigged car to target the troops loyal to President Abedrabbo Mansour Hadi who had recently set up the position in the town of Loder in Abyan province to fight the jihadists, the military officials said.
Earlier reports put the number of dead at three, with nine wounded, but hospital officials revised the toll upwards.
Al-Qaeda in the Arabian Peninsula (AQAP), seen by the United States as the global terror network's most dangerous branch, has exploited years of conflict between the government and Iran-backed Huthi rebels to expand its presence in Yemen.
The AQAP statement did not give an estimate of casualties in the attack.
Al-Qaeda's jihadist rival, the Islamic State group, has also strengthened its control of parts of the impoverished country on the tip of the Arabian Peninsula.
Yemeni special forces, trained by the United Arab Emirates and backed by the United States, on Wednesday launched a major operation against the Al-Qaeda fighters, driving them out of the oil-rich Shabwa province.
The jihadists are thought to have moved further south into neighbouring Abyan province.
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