Some differences of opinion were solved, some modality articles were approved, and it was decided that new proposals made would be surveyed and results would be reported at next session, Soltaniyeh said on Wednesday night.
"Expert level negotiations with the eight-member IAEA delegation, headed by deputy agency secretary general on the modality, which is a framework for final solving of the claims made about the Iranian nuclear program were done today in Tehran," he added.
The date for next round of talks between the two sides has not being set yet.
The International Atomic Energy Agency team, headed by Deputy Director-General of the International Atomic Energy Agency Herman Nackaerts, arrived in the Iranian capital, Tehran, in the early hours of Wednesday.
The IAEA experts discussed issues pertaining to Tehran's nuclear energy program with Iranian officials.
Soltaniyeh headed the Iranian negotiating team.
Nackaerts said on Thursday that the representatives of Iran and the IAEA in their Wednesday meeting in Tehran exchanged views on a modality plan about Tehran's nuclear program.
He added that the IAEA is committed to continue talks with Iran on the country's nuclear program.
Speaking to reporters at Vienna airport after returning from Tehran, he said during talks with Iranian officials the two sides exchanged views on Modality plan but they did not reach any final agreement to this end.
