Zimbabwean President Robert Mugabe has said that 14 hours of talks with the opposition have ended inconclusively, BBC reported.
However, Mr Mugabe said the talks would continue later on Monday, adding he was "confident" a deal could be reached.
South African President Thabo Mbeki has been acting as mediator at the talks, which began on Sunday morning at a hotel in Zimbabwe's capital, Harare.
Opposition leader Morgan Tsvangirai declined to comment as he left the hotel following the meeting.
The key issue at the talks is how much power Mr Mugabe will hold, and what role Mr Tsvangirai will take on.
One widely touted solution is that Mr Mugabe, the Zanu-PF leader, may become ceremonial president while Mr Tsvangirai, leader of the opposition Movement for Democratic Change (MDC), becomes executive prime minister.
Chairs and bouquets of flowers had been set up on Sunday in a room at the hotel where the talks are taking place in anticipation of a breakthrough.
Monday is Heroes' Day in Zimbabwe, honouring those who died in the 1970s guerrilla war against white minority rule.