Treblo's detector flags Fenix Flexin's 'Rubberz' as AI-generated with 99.99% accuracy

Treblo, an AI music generation company, has released an open-source detection tool called the Treblo AI Music Classifier, designed specifically to identify audio generated by its own model. The company says the classifier has a false positive rate of less than 1 in 10,000, making it highly specific—though it can't detect other AI music tools. In a blog post, Treblo announced that the tool analyzed Fenix Flexin's track 'Rubberz' and returned a 'very likely Treblo' verdict with 'high confidence.' CEO Ryan Tremblay told The Verge that this makes 'Rubberz' the first known AI-generated song to reach the Billboard Hot 100, adding fuel to an already heated controversy.

Fenix Flexin has publicly denied using AI to create 'Rubberz' and posted low-quality clips he claims are the original project files. However, musician Medasin countered that those clips appear to be faked using an AI stem separator—a tool that splits existing audio into separate tracks, making it look like a genuine recording session. Treblo seems to embrace the attention, with Tremblay noting that someone used their model to create a sound millions connected with. The incident highlights the growing tension between AI music tools, artist accountability, and the difficulty of proving provenance in an era of synthetic media.