OpenAI, Anthropic, and Google began sharing threat intelligence through the Frontier Model Forum to detect and counter adversarial distillation by Chinese AI firms. Anthropic identified DeepSeek, Moonshot AI, and MiniMax as having generated over 16 million exchanges via approximately 24,000 fraudulent accounts to extract training signal from Claude. The collaboration is modeled on cybersecurity industry threat-sharing norms: when one lab detects an attack pattern it flags it for the others. The Japan Times and The Decoder confirmed this marks the first time the Forum has been activated as an active counter-intelligence operation against a named external adversary.