And it came after Pope Francis set the stage for a radical shift in tone about Roman Catholic Church teaching on homosexuality when he said "Who am I to judge?" about the sexual orientation of priests.
Parade organizers said they were "remaining loyal to church teachings," and Cardinal Timothy Dolan, next year's grand marshal, said the committee had his "confidence and support."
"I have no trouble with the decision at all," he said.
The exclusion of gay groups prompted first-term Democratic Mayor Bill de Blasio to refuse to march in the 2014 parade, and Guinness and Heineken withdrew their sponsorships.
De Blasio said Wednesday that the inclusion of OUT@NBCUniversal was "a step forward," but he would not commit to next year's parade until he knows more.
Guinness' parent company said, "We are pleased to see that the various parties are making progress on this issue." It said it was open to talking with the organizers about supporting the 2015 parade.
NBC, whose local affiliate has been televising the parade since the 1990s, would not confirm reports that it had threatened to drop coverage over the issue of gay participation. But it said NBC executive Francis Comerford, a member of the parade committee, helped with the agreement to include OUT@NBCUniversal.
Whether it was the mayor or the pope or the people at Guinness who prompted the decision, gay groups took some satisfaction in their role even if it didn't produce everything they wanted.
"This was decades' worth of work," said Ellis, of GLAAD. "The LGBT organizations are the ones that put pressure on the corporations that were sponsoring the parade, and when they withdrew it was the straw that broke the camel's back."
Associated Press writers Shawn Pogatchnik in Dublin and Jonathan Lemire and Karen Matthews in New York and AP Television Writer David Bauder in New York contributed to this report.