Sprint had already re-established peering with Cogent prior to you writing this post.
From
http://www.sprint.net/cogent.php
"On Thursday, October 30th, Sprint Nextel completed a disconnection of its network from Cogent Communications. This action was taken by Sprint after Cogent breached its contract and failed to pay for its ongoing connection to the Sprint network, despite repeated collections attempts by Sprint.
Until this issue is resolved, Sprint will continue to work tirelessly to the extent within our control to mitigate the effects on customers. As part of an interim solution, Sprint initiated a temporary reconnection to the Cogent network on Sunday, November 2nd so that customers would have temporary access while longer-term alternate and permanent access options are explored."