Cybersecurity — 2026-04-19

White House Chief of Staff, Treasury Secretary meet Anthropic on Mythos cyber model; Pentagon risk designation still in dispute

Treasury Secretary Scott Bessent and Chief of Staff Susie Wiles met Anthropic CEO Dario Amodei Friday on the Mythos model, which the company and the UK's AI Security Institute say represents a meaningful step-up in the model's ability to find and exploit software vulnerabilities, already rolled out to roughly 40 major firms under Project Glasswing. The meeting marks a reset from the Pentagon's unprecedented supply-chain risk designation and Trump's February directive barring federal use of Claude; Judge Rita Lin blocked the latter in March. Both sides described the conversation as productive and constructive, with cybersecurity, AI-race leadership, and safety as shared priorities. Central banks in the US, UK, and Canada are separately briefing bank executives on Mythos-related risk.

Analysis
The Friday meeting, confirmed productive by both sides with sources converging, is a de facto administrative climbdown on the Anthropic blacklist: Mythos's step-up capability in finding and exploiting software vulnerabilities, validated externally by UK AISI, makes federal exclusion operationally untenable for cyber-defense. The simultaneous US-UK-Canadian central bank briefings of major financial institutions confirm that Glasswing-class access is being coordinated as a near-term patch on critical-infrastructure cyber posture, not a generic research arrangement. The shift from Fortune's April 17 preview is that both Bessent and Wiles attended, raising the meeting's principal weight, and that bank-level briefings are now in motion, moving the dispute from posture to operational re-engagement. The federal-use ban is very likely rescinded in some form within 45 days, framed as a limited-use authorization tied to cyber-defense workloads; the administration may instead be extracting autonomous-weapons guardrail concessions as the price of restored access, in which case Anthropic's safety posture, not the Pentagon designation, becomes the next flashpoint.
2 sources
  1. White House Meets AI Firm Amid Cyber Fears - Sharecafe
  2. White House chief of staff to meet with Anthropic CEO about dangerous new Mythos model - Fortune/AP

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