Standard and Poor's on Friday upgraded Greece's credit rating to "B-" from "CCC+" with a stable outlook, citing its progress in cutting costs and recapitalizing banks.

Greece is "broadly complying" with the terms of its 86 billion euro (roughly $92 billion) bailout deal financed by euro zone states, opening the possibility for broader debt relief, the ratings agency said. It noted that Greece's economy has "proved more resilient" than expected.