Refusing to divulge the range of the new under-development missile, he said the force multiplier capability of the missile would be because of its Multiple Independently Targetable Re-entry Vehicle (MIRV) capability.
The Agni-5 ballistic missile, which was test-fired in April 2012, has a range of upto 5,500 kms and it is believed that the Agni-6 would have a range longer than its predecessor.
"It will have force multiplier capability by the MIRV approach which would enable us to deliver many payloads at the same time using only one missile.
"Work is on in this area and designs have been completed. We are now in the hardware realisation phase," he said.
DRDO officials said once the Agni-6 is developed, it would propel India into the elite club of nations with such a capability including the US and Russia.
The DRDO chief said his organisation was also working towards developing a cruise missile defence programme which would enable the armed forces to defend against low-flying cruise missiles and enemy aircraft.