More than 100 companies and organizations, including OpenAI, Anthropic, Google, Microsoft and Amazon Web Services, have signed an open letter calling for a global effort to improve cybersecurity defenses as artificial intelligence capabilities advance.
The letter, published Thursday, argues that the timeframe to strengthen defenses before AI-enabled attacks become more widespread and complex is rapidly dwindling. Conversely, the letter says the same advances can give defenders new ways to find and fix vulnerabilities that have accumulated over years, a period the signatories call a “defenders’ window.”
“Each of us can reduce risk now,” the letter reads. “All organizations, cybersecurity companies, technology partners, governments, and AI frontier companies have an important role: accelerate defenders’ priorities with tools, funding, and hands-on support, especially for critical infrastructure organizations with limited budgets.”
Aside from AI-centric companies, financial institutions like Capital One, Mastercard and Visa, and cybersecurity firms like CrowdStrike, Palo Alto Networks, and Proofpoint, also signed the letter. Organizers describe the effort as ongoing, with more organizations expected to join over time.

The letter states that “status quo security won’t be enough.” It cites longstanding bugs, excessive permissions, misconfigurations, unpatched software, weak authentication and technical debt in legacy systems as sources of exposure. Security teams, particularly those protecting critical infrastructure, have been historically under-resourced, the letter says, and need what it describes as a surge in tools, resources and hands-on support.
In a conversation with CyberScoop Wednesday, top brass from Palo Alto networks said they had seen enough from internal frontier AI model testing and malicious in-the-wild use of commercially available AI tools to be genuinely concerned.