A senior US official said President Barack Obama was set to announce a 9,800-strong US force will remain in the conflict-ridden country for much of next year, effectively bequeathing a vexed 14-year war he inherited from George W Bush to his successor.
During Obama's 2008 and 2012 election campaigns he pledged to end the war that has now killed more than 2,000 Americans and injured or maimed tens of thousands more.
However, Taliban spokesman Zabiullah Mujahid said the insurgents would continue to fight on and prompt US forces to exit Afghanistan.
"When the attacks continue to mount on the occupiers and when they see they have to spend more money in their meaningless war, they will be forced to change their oppressive policy. Our jihad will continue until the last occupier is expelled," the spokesman said.
"They were the ones who decided to invade Afghanistan. But it will be us who decide when they leave," he added.
Two weeks ago the Taliban scored their biggest military victory since the 2001 US-led invasion, capturing the city of Kunduz.
