"We had some useful and constructive discussions, some progress has been made but actually we are far from reaching an agreement," Araghchi said.
According to the deputy foreign minister, the talks will continue next week.
Araghchi declined to comment on Iran's reported readiness to consider a reduction of the number its nuclear centrifuges.
The UN Security Council and a number of countries have accused Iran of trying to develop nuclear weapons. Tehran has repeatedly rejected those claims, stating that its uranium enrichment program is for peaceful purposes only.
Iran and the P5+1 group have held several rounds of talks on Tehran's nuclear program in recent years with limited results. A long-term agreement has to be reached by July 2015.