In his 1967 DownBeat review of the initial release, Amiri Baraka wrote: "The music is beautiful on this album... These two players... are making some of the deepest music anywhere. It wants nothing."
Peter Margasak included the album in his list of "Favorite Albums of 2020," and wrote: "Essential coupling of two insanely rare duo albums from a 1966 concert at Yale University: Pullen at his most ferocious and probing, Graves making a huge step in establishing his radical approach to polymetric movement."
In a review for Point of Departure, John Sharpe commented: "The five pieces represent a true dialogue... Although intensity levels vary, the exchanges remain resolutely non-melodic and non-metric throughout... Even after all this time the music still challenges preconceptions. It remains a classic of the genre and deserves to be widely heard."
Thurston Moore included Nommo in his "Top Ten From The Free Jazz Underground" list, first published in 1995 in the second issue of the defunct Grand Royal magazine, calling the interplay between the musicians "remarkable."