Over 100 tech companies signed an open letter warning of a limited window to prepare for AI-enabled cyberattacks on critical infrastructure.

On August 27, 2026, more than 100 technology companies including OpenAI, Anthropic, Google, and Microsoft signed an open letter urging collective action to strengthen cyber defenses against AI-enabled cyberattacks. The letter called for organizations, cybersecurity companies, governments, and frontier AI companies to raise security standards, share threat intelligence, fund cyber defense, and provide access to AI-powered defense tools for critical infrastructure operators. The signatories warned that AI-enabled cyberattacks will become more widespread and sophisticated within months.