116 companies including Visa, Mastercard, Shopify, Capital One and GM signed a joint call for AI cyber defense.

OpenAI published "A call for collective action on cyber defense" on August 27, co-signed by Anthropic, Google, Microsoft, Amazon, Cisco, Oracle, Cloudflare, CrowdStrike and Palo Alto Networks, plus non-tech signatories including Capital One, Mastercard, Visa, General Motors and Shopify. The letter argues there's a limited window, possibly months, before AI-enabled attacks scale against hospitals, water treatment and core internet infrastructure, and sets three principles: current security practice is insufficient, defenders need cyber-capable AI, and the response has to be collective. (CNBC) The signature list is the signal. Payments and commerce platforms don't normally co-sign frontier-lab policy documents.