Anthropic, as per several media reports, had already documented the evidence in February — three Chinese AI firms, DeepSeek, Moonshot AI, and MiniMax, had collectively generated over 16 million exchanges with Claude through roughly 24,000 fraudulent accounts. OpenAI reported similar theft of its ChatGPT models. By April, OpenAI, Anthropic, and Google, otherwise fierce commercial rivals, began sharing attack intelligence with each other to fight back.