LA Rapper Fenix Flexin Quietly Concedes AI Built 'Rubberz' After Producer Exposes the Tool

Fenix Flexin, the Los Angeles rapper known for his work with Shoreline Mafia, has stopped denying that artificial intelligence played a role in producing his 80s-inflected track 'Rubberz.' In a comment on one of his Instagram posts, Flexin stated he never claimed AI wasn't involved — only that it had nothing to do with the recording process itself, and that he wasn't aware of the app's name until the mixing stage.

The controversy was sparked by producer Medasin, who posted videos asserting that a platform called Treblo — previously known as Sonauto — was the tool used to generate the song's instrumental backbone. Treblo subsequently released an AI detection feature that reportedly identified 'Rubberz' as one of its own AI-generated outputs, adding a layer of technical evidence to Medasin's claims.

Fenix's Instagram comment came in response to a fan pointing out that fellow rapper Tyga had separately acknowledged using AI for his controversial 80s-influenced album '$tarface.' The parallel cases have drawn wider attention to how AI music tools are quietly entering mainstream hip-hop production pipelines, often without disclosure to listeners or collaborators.

The situation raises real questions about creative credit and transparency. If the instrumental was AI-generated through a platform like Treblo, traditional songwriting and production credits become murky — particularly for the human producers and musicians who might otherwise expect acknowledgment and royalties.

Treblo's decision to build and deploy an AI detection tool tied to its own outputs is itself a notable development. It suggests the company is positioning itself as a verifiable provenance platform, though critics may question the independence of a detector built by the same company whose product it is identifying.