Today's meeting at a luxury hotel in the Swiss city was aimed at what Zarif had already described as assessing the latest progress in the nuclear talks between Tehran and world powers and making decisions accordingly.
The two top diplomats were accompanied by their deputies.
On Friday, top Iranian nuclear negotiators, Abbas Araqchi and Majid Takht Ravanchi, left Austria's Vienna for Geneva to join the high-profile meeting.
They had been in Vienna since Wednesday to press on with the job of drafting the text of a final nuclear deal between Tehran and the Group 5+1 (Russia, China, the US, Britain, France and Germany).
US Energy Secretary Ernest Moniz and the European Union's secretary general for the external action service, Helga Maria Schmid, also attended the Geneva talks.
The EU coordinates diplomacy with Iran on behalf of the Group 5+1 (also known as the E3+3 or P5+1).
On April 2, the two sides reached a framework nuclear agreement in Lausanne, Switzerland, with both sides committed to push for a final deal until the end of June.