Concord, Universal, and ABKCO asserted that Anthropic concealed these torrenting violations during discovery in an earlier case, Concord Music Group, Inc., et al. v. Anthropic PBC (Concord I), which addressed the exploitation of 499 musical compositions in Claude AI models. The publishers alleged that Anthropic’s new AI models, including Claude 4.5 Sonnet, Claude 4.5 Haiku, and Claude 4.5 Opus, were trained to memorize the publishers’ works. The publishers are pursuing relief on multiple counts, including direct copyright infringement, contributory and vicarious copyright infringement, and DMCA violations. Instead, Anthropic gathered training data that included the publishers’ copyrighted works and provided the site and facilities necessary for users of its AI models to commit direct infringement.