Over 100 Companies Including OpenAI, Google, Anthropic Sign Open Letter Warning of Imminent AI Cyber Attacks

OpenAI, Google, Anthropic, AWS, Microsoft, Cloudflare, CrowdStrike, and over 100 other companies signed an open letter on August 27, 2026, warning that "AI-enabled cyber attacks will become far more widespread and sophisticated" within months. Published at openai.com/collective-cyberdefense, the letter calls for collective defense but sets no enforcement mechanism or technical specification.