The ToxiGen dataset is a large-scale, machine-generated benchmark designed to improve the detection of implicit hate speech and subtly toxic language in artificial intelligence systems. Comprising approximately 274,000 toxic and benign statements across 13 demographic groups, the dataset was produced using a massive pretrained language model guided by demonstration-based prompting and an adversarial classifier-in-the-loop decoding framework. By generating nuanced toxic examples alongside benign statements that mention demographic groups, the dataset aims to overcome common machine learning vulnerabilities, such as over-relying on explicit slurs or incorrectly flagging neutral discussions of marginalized identities as toxic. It serves as a standardized resource for evaluating and training toxicity classifiers to recognize subtle hostility, reduce false-positive rates on identity terms, and better detect machine-generated toxic text.