A report by 404 Media revealed that OpenAI uses human reviewers, called prompt reviewers, to assess anonymized ChatGPT conversations under an internal project named Project Lily. Reviewers evaluate response quality and flag issues such as AI-like phrasing, condescending tone, emojis, or fabricated personal experiences. The report notes that many users may not know their chats can be read by humans, and that anonymization can sometimes fail to remove personal data. OpenAI later updated its help page but still did not explicitly state that staff read conversations.