Two opposition officials say the breakthrough gives opposition leader Morgan Tsvangirai control of the government and the police force that has been terrorizing the opposition.
Mugabe controls defense forces under the deal agreed Thursday night after three months of tortured negotiations.
The two officials said Tsvangirai broke a deadlock with an agreed proposal for a council of state made up of Mugabe and two deputies and Tsvangirai and two deputies.
Two other officials said some opposition leaders are unhappy about the deal. All four officials spoke Friday on condition of anonymity because of a media blackout.