Major tech companies including OpenAI, Anthropic, Microsoft, Alphabet, and Amazon are calling for a society-wide defensive surge to defeat what they describe as an impending wave of hacks driven by artificial intelligence.

In a joint letter issued Thursday, the companies — along with more than 100 others including Broadcom, Capital One, Cloudflare, CrowdStrike, General Motors, IBM, Mastercard, Oracle, Robinhood, Shopify, and Visa — said there was a limited time “to make our digital world much more secure” ahead of the AI threat.

“We have a limited window to strengthen cyber defenses,” the letter said. “In the coming months, AI-enabled cyber attacks will become far more widespread and sophisticated as models around the world become increasingly capable.”

Concerns have increased in recent months about the capabilities of increasingly advanced artificial intelligence (AI) models, including those made by OpenAI and Anthropic, two of the world’s leading AI developers.

In June, the world’s “Five Eyes” intelligence alliance — composed of the US, Britain, Canada, Australia and New Zealand — issued a rare joint statement warning that the AI revolution was poised to “fundamentally transform” cybersecurity.