Fenix Flexin says AI was involved in “Rubberz” — but the workflow is still unclear

Fenix Flexin has acknowledged that AI was involved in “Rubberz”, after spending much of the summer rejecting claims about the song’s recording process. In an Instagram comment reported by XXL on 7 August, the Shoreline Mafia rapper said he had never denied using AI, only that it had nothing to do with recording.

That distinction does not explain the production. Fenix said he did not know which app was involved until the track was mixed, but he has not identified what was generated, who prompted it or how generated material reached the final master.

The question matters because “Rubberz” had already become a genuine commercial hit. WIRED reported that it reached No. 58 on the Billboard Hot 100 while listeners and producers were still debating whether its 1980s-style vocal and arrangement were synthetic.

A detector is evidence, not a complete session history

Producer Medasin connected an earlier file marked “Sonauto” to the track and reproduced similar musical and lyrical patterns in Treblo, the service formerly known as Sonauto. Treblo’s own detector later returned “Very likely Treblo” for “Rubberz,” and a cofounder said someone appeared to have used the company’s model.

Those signals make some form of Treblo use plausible, and Fenix’s comment confirms AI was involved. They do not independently establish that every vocal, lyric or instrument was generated. A useful credit would separate the human performance from the generated composition or production material instead of collapsing the whole song into a yes-or-no label.