A music detection tool released by AI app Treblo has flagged rapper Fenix Flexin's summer hit "Rubberz" as "very likely" generated using its software, according to a report published by Wired. The revelation appears to settle months of debate over whether the track, which reached No. 58 on the Billboard Hot 100 after its June release, was created with artificial intelligence. Treblo's built-in detector also flagged music by Tyga, Flexin's labelmate, as "likely Treblo," marking what may be the first time an AI music service has publicly confirmed that chart-performing songs were made with its technology.
Suspicions around "Rubberz" began immediately after its release, with fans noting the song's dramatic genre shift from rap to synth-pop and a vocal performance that sounded nothing like Flexin's recognizable nasal tone from his Shoreline Mafia days. Independent producer Medasin posted a video last Thursday claiming he'd reverse-engineered the track's creation using Treblo, formerly called Sonauto until two days before "Rubberz" dropped. Medasin showed a screenshot from Flexin's Instagram Story revealing a filename ending in "Sonauto.mp3," and demonstrated that Treblo could generate songs with nearly identical lyrical structures. When Medasin prompted the app with tags like "80s synthwave" and asked for rapper lifestyle lyrics, he got lines such as "Diamond chains hanging heavy" compared to "Rubberz'" "Now I bought a heavy diamond chain." Both songs featured variations of "pockets thick" and "plastic smiles." Wired's own test produced a track with the couplet "Rings on every finger / Leather seats and cedar scent linger," mirroring the "Rubberz" line "Gold rings on my fingers / Still your perfume lingers."
Treblo cofounder Ryan Tremblay confirmed the company had no prior contact with either artist and wasn't aware "Rubberz" existed until it hit the Billboard chart. "Someone appears to have used our model to find a sound that millions of people connected with, and that's exciting," Tremblay told Wired. The company published its "Was This Made With Treblo?" detector late Sunday night, describing it as a tool designed to identify songs made with its software with minimal modification. Treblo's site states the false positive rate sits under one in 10,000, though the detector hasn't undergone independent review. Both Flexin and his producer Purps on the Beat have repeatedly denied using AI, with Flexin posting then deleting a video Thursday showing what he claimed was the original project file, which music producers in the comments said looked like someone had used a stem separator on an existing track.
The timing coincides with a broader industry push toward identifying machine-generated content, according to the report. LinkedIn rolled out a "seems like AI" flagging button the same day Medasin posted his first video, while Substack recently released an AI newsletter detector and Tidal has blocked monetization of AI-generated tracks. A bipartisan AI Labeling Act pending in the US Senate would require platforms to visibly mark AI-generated content. Yet the response to Medasin's investigation revealed a divide: many commenters said they didn't care whether "Rubberz" was AI-generated and that the producer was simply jealous. Medasin acknowledged he still finds the song catchy but argued artists should disclose their methods so listeners can decide for themselves. "This is, like, a critical moment in music history," he said, calling deception for profit "unethical on a very spiritual level." Music fans now have their answer to the summer's most contentious question—they just have to figure out whether it changes how they feel about the song. The episode suggests transparency may matter less to audiences than industry gatekeepers expect, particularly when the output itself resonates regardless of origin.