Universal and Sony sued Suno a second time over 60,202 recordings, calling v6 "fruit of the same poisoned tree."

UMG and Sony filed in the District of Massachusetts after a judge refused to let them amend the original June 2024 suit, naming 60,202 specific recordings surfaced by forensic analysis of training data. The novel argument is that Suno's licensed v6 models are tainted because they were trained partly on user outputs from the earlier unlicensed models. At the $150,000 willful-infringement ceiling the named works carry a theoretical maximum above $9B. The distillation-taint theory threatens any model whose clean successor was trained on the dirty one's outputs, which is a lot of models.