Earlier, leaders including the emirs of Kuwait and Qatar, the king of Bahrain and the UAE vice president arrived in Saudi Arabia yesterday for a previously unannounced summit aimed at resolving their differences.
Local media reported last week that leaders of the six-nation alliance, which also includes Oman, were expected to hold a meeting ahead of their annual summit in Doha on December 9-10, in a last-ditch bid to overcome internal differences.
Qatar is accused of supporting the Muslim Brotherhood and offering a safe haven to other banned Islamist groups.
Saudi Arabia, the UAE and Bahrain all withdrew their ambassadors to Doha in March, sparking one of the Gulf Cooperation Council's worst diplomatic rows since its creation in 1981.
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A GCC statement yesterday said the agreement for the ambassadors to return to Doha "promises the opening of a new page that will present a strong base, especially in light of the sensitive circumstances the region is undergoing".
The dispute had led to reports of the venue for the annual GCC summit being moved from Doha, although Kuwait last week denied any change.
A GCC foreign ministers' meeting which had been scheduled on November 10 to prepare for the summit was postponed as mediation efforts continued.
Saudi Arabia, Bahrain and the UAE have accused Qatar of meddling in their internal affairs by supporting the Brotherhood.
Riyadh and Abu Dhabi label the Brotherhood a "terrorist" group, and the UAE has jailed dozens convicted of links to the Islamist organisation.
The UAE on Saturday issued a list of 83 Islamist groups which it classified as "terrorist organisations", among them the Qatar-based International Union of Muslim Scholars, which is headed by the Brotherhood's spiritual guide Sheikh Yusuf al-Qaradawi, a Qatari citizen.