Anthropic’s Mythos Preview and Project Glasswing have redrawn the cyber threat landscape. This brief explains what changed, what it means for risk selection and pricing, and what the insurance market can do to respond. 

INSIDE THIS BRIEF

A concise, human-written briefing on what Anthropic’s Claude Mythos Preview and Project Glasswing mean for cyber underwriting, and what the insurance market can do to respond before the next renewal cycle.

Executive Summary
Why the hard cyber insurance market arrives by Christmas

01 The Glasswing Announcements
Anthropic’s Mythos Preview and the industry coalition

02 Notes for Cyber Underwriting: Four Big Shifts
N-day collapse · expert-attacker ceiling · open-source supply chain · AI as attack surface

03 Why the Guardrails Aren’t Enough
Model weights, disclosure volume, and the democratization problem

04 What The Insurance Market Can Do About It
Consolidated action plan with rationale and timeframes

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