Sony and Universal Music Group (UMG) have once again taken legal action against the AI music startup Suno. The two major music labels are accusing Suno of continuing to violate their copyrights with its latest v6 model. Their claim centers on the idea that Suno’s new model is still using data that originally came from unlicensed music, which was scraped from platforms like YouTube. This data was used to train earlier versions of Suno’s AI, and now, the labels argue, the company is using outputs from those models to train the latest one—without proper licensing. The lawsuit, detailed in a complaint obtained by The Verge, introduces a new term: "model laundering." Sony and UMG argue that simply training a new AI model on the outputs of a previously infringing model doesn’t erase the copyright violations. Instead, they say it shifts the value of the original music—without permission—into a new form of AI-generated content. The labels are essentially saying that the infringement is just being passed along, or "laundered," through successive AI models. Sony and UMG are among the few major record labels that have not signed a licensing agreement with Suno. Many other labels have reached deals with the company to allow the use of their music in AI-generated content. However, these two labels remain firm in their stance that Suno’s use of their music—either directly or indirectly through AI training—violates their rights. The legal battle highlights the growing tension between AI developers and traditional copyright holders. As AI tools become more advanced, the question of how to fairly compensate artists and rights holders for their work in training these models continues to be a contentious issue. With Suno’s latest model now under scrutiny, the case could set a precedent for how such disputes are handled in the rapidly evolving world of AI and music.