An anthology is a compendium of stories by different authors. That's how the term is usually applied in the field of SF and fantasy.
Anyway—that said, I'd like to draw attention to the following three anthologies, especially the last one:
1. The Best of the Best: 20 Years of the Year's Best Science Fiction, ed. Gardner Dozois (St. Martin's Press/Griffin, 2005)
2. The Best of the Best, Volume 2: 20 Years of the Best Short Science Fiction Novels (St. Martin's Press/Griffin, 2007)
3. The Very Best of the Best: 35 Years of the Year's Best Science Fiction, ed. Gardner Dozois (St. Martin's Press/Griffin, February 2019)