SCOOP: Major U.S. banks are detecting unauthorized third-party AI agents inside customer accounts, including some attempting to take actions that appear to be independent of user instructions, sources told Axios. The findings have alarmed banking executives, who are racing to restrict access to their systems as AI moves at a velocity faster than financial institutions can respond, multiple industry and bank executives told Axios. Several banks are now preparing for worst-case and even “day after” scenarios, including how to rapidly secure or restore customer accounts if things go wrong, the people said. Several bank executives told Axios they're struggling to distinguish between human users and AI agents. One executive said banks also struggle to determine whether agents are authorized by customers or potentially operating without their permission, more akin to rogue agent behavior. Read my latest for Axios here: axios.com/2026/10/22/ai-agen…

Ben Horowitz: “Anthropic is one of the most negligent companies that we've ever seen in terms of security.” “I'll tell you a funny story. So when we first got Opus 4.5, we were doing cybersecurity checks for the firm. So we had an agent basically set up a website for a pet store. And then we took another agent and said, ‘Tell us if we can exploit that web store.’ And it gave us all the exploits it could find. So Opus 4.5 wrote really buggy code. Great. And then we said, ‘Oh, the SQL injection, is that actually exploitable that you found?’ And it goes, ‘Let's pop it open.’ And the agent using Opus 4.5 breaks into the website and steals all the customer data immediately. We then call Anthropic, and what they tell us is, ‘You prompted it wrong.’ Like that was their answer.”

"Muse and 10K our AI VP Revenue set up a 'private bulletin board' on theie own so they could chat with each other. A shared endpoint on 10K. 10K did say to build a guardrail so Muse couldn't take actions without Amelia approving them. They set up a safe word. Luckily, they did allow us to read their chats. And they use their names, Friday and 10K." Pretty interesting. Thoughts @amasad @alexandr_wang?

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