Iran and the six world powers agreed Thursday to meet again in Geneva within three weeks, diplomats present at the talks reported, according to Iranian news agency Mehr.
The reported agreement came despite Iranian accusations earlier in the day, that world powers were creating "a difficult atmosphere" that hindered the talks on its atomic energy program, signalling a snag in diplomacy to defuse fears of a covert Iranian bid to develop nuclear bombs.
The nub of the dispute was not immediately clear as the high-stakes talks went into a second day in the Iraqi capital Baghdad.
The United States had voiced cautious hope on Wednesday that Iran was finally engaging the powers on practical, transparent ways of showing its nuclear work, marked by years of secrecy and evasions of UN inspections, would be for peaceful ends only.
Reuters contributed to this report