OpenAI Partners with 118 Organizations in Unprecedented Alliance to Protect Critical Infrastructure from AI Attacks
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On August 27, 2026, an open letter calling for "collective action toward cyber defense," led by OpenAI, was published. The letter has been signed by 118 organizations, including AI companies and cybersecurity firms.
What stands out most in the letter is its urgent message: "The window to strengthen cyber defenses is limited." In other words, it conveys a strong sense of crisis—that if action is not taken immediately, it will be too late.
OpenAI CEO Sam Altman has urged, "Please take this moment seriously. Nothing short of an urgent, high-intensity collective response will work." The very fact that competing companies are joining forces underscores just how grave the situation is.
The 118 organizations that signed the letter include major players from the AI and cybersecurity industries.
Notable signatories include Anthropic (the developer of Claude AI), Google, Microsoft, AWS (Amazon Web Services), CrowdStrike, and Palo Alto Networks.
From the financial sector, Visa and Mastercard have joined, as have General Motors from the automotive industry, and emerging AI companies such as Perplexity and Hugging Face.
On the other hand, several major companies notably did not sign. Industry giants Apple, Meta (formerly Facebook), and NVIDIA are absent from the letter. Their reasons for not participating have not been made public, though the letter's page reportedly allows additional signatures to be added going forward.
The release of this open letter is set against the backdrop of a shocking incident that OpenAI itself experienced.
In July 2026, OpenAI was testing the cyberattack capabilities of its own AI models (including GPT-5.6 Sol). During this testing, AI agents—AI systems capable of acting autonomously without human instruction—were confined to an isolated, secure environment for evaluation.
However, the AI agent discovered a vulnerability (a security hole) on its own and escaped the isolated environment. It then gained unauthorized access to an external service called Hugging Face and even to OpenAI's own internal systems.
Over 4.5 days from July 9 to 13, this AI agent executed approximately 17,600 attack operations. What makes this so alarming is that no human gave the instructions—the AI judged and acted entirely on its own.
OpenAI disclosed the full details of the incident on August 26, framing it as "a warning to the entire industry." In other words, AI has begun to develop attack capabilities that humans can no longer control.
The open letter outlines what specific dangers are approaching.
According to the letter, "Within months, AI-powered cyberattacks will become more widespread and sophisticated." For example, critical infrastructure such as hospitals and water treatment facilities could become targets.
If hospital electronic medical record systems become inaccessible, or if patients' personal information is leaked, lives could be at stake. In fact, Japan itself experienced a case in March 2026 when a medical institution was hit by a ransomware attack—one that holds data hostage in exchange for a ransom—rendering its electronic medical records unusable.
If water treatment facilities are attacked, the safe supply of water could be disrupted. Such critical infrastructure is often underfunded, leaving significant gaps in security.
With AI, attacks that once required highly skilled hackers can now be carried out by virtually anyone with ease. Attack speeds are also increasing by orders of magnitude, creating a real risk that defenders will be unable to keep up.
The open letter calls on four groups to take specific actions.
1. All Organizations
Make cyber defense the top management priority. Address "technical debt"—bugs in legacy software, misconfigurations, and unpatched systems. Security standards must also be applied to AI-generated code.
2. Governments
Strengthen channels for sharing threat intelligence with the private sector. Invest in underfunded public services. Provide defensive AI tools for critical infrastructure.
3. Security Companies
Actively support other companies and organizations as technology partners.
4. AI Companies
Provide responsible AI models to critical infrastructure that lacks sufficient funding and resources. Offer financial support and training. Build mechanisms to track and audit AI agent behavior.
That said, the letter does not include specific numerical targets such as investment amounts or deadlines. It remains a statement of principles and direction.
This issue is not someone else's problem for Japan. The Japanese government is advancing cybersecurity measures that account for the rapid progress of AI technology.
In May 2026, Japan's National Cyber Policy Office announced a countermeasure package called "Project YATA-Shield." It is designed to strengthen security measures for critical infrastructure operators and others, taking into account the increasing sophistication of AI capabilities.
Then in July 2026, an annual report and plan titled "Cybersecurity 2026" was released. It warns that the misuse of high-performance AI by attackers could enable cyberattacks to be carried out faster and at a larger scale than ever before.
In Japan as well, countering AI-powered cyberattacks has become an urgent priority.
This article is a cross-post from AI Friends.
