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The Penguin Guide to Jazz states "Rhythm X is a valuable glimpse of the earlier, pre-sabbatical Brackeen ... Though nowhere near as individual as the later Silkhearts, the 1968 record is packed with gritty detail." In his review for AllMusic, Rob Ferrier states "On this record, the little-known Charles Brackeen brings his saxophone to a party with most of Ornette Coleman's band. As might be expected, while Brackeen certainly holds his own, it's Ornette's boys who bring the thunder, playing around Brackeen's muscular alto as if they were a gang jumping on a new member ...with results that are often surprising and never short of beautiful".