Anthropic published a 244-page Alignment Risk Update for Claude Mythos Preview on 7 April 2026, formally abandoning its AI Safety Level (ASL) capability-threshold framework in favour of autonomy-focused threat models. The same update expanded Project Glasswing to add Broadcom, CrowdStrike, Nvidia, Palo Alto Networks and Cisco alongside the original twelve founding partners announced on 8 April. The Glasswing Programme is backed by $100 million in model usage credits, distributing restricted Mythos access to selected partner organisations under coordinated-disclosure terms.
The ASL framework classified risk by capability thresholds: a model crossed a line when it demonstrated a specified skill, and escalating mitigations followed. Its autonomy-focused replacement measures risk by sustained multi-step execution, aligning with the attack-chaining dimension AISI separately confirmed. All Glasswing partners therefore have to rewrite the internal risk frameworks they were running under ASL, mid-deployment, during live coordinated disclosure.
The update discloses that over 99% of the vulnerabilities Mythos discovered during its vulnerability research programme remain unpatched, with coordinated disclosure still in progress. For the Glasswing partners, that means the security posture of the operating systems and browsers their staff use daily is currently weaker than it was before Mythos began running, because Mythos has a list of undisclosed paths into software they all depend on. CrowdStrike and Palo Alto Networks, newly added as of 7 April, are among the security vendors most directly affected by that exposure.
The methodology shift also changes what frontier AI risk governance looks like. Capability thresholds produced discrete pass/fail tests that could be regulated; autonomy thresholds require ongoing observation of how a model behaves across time and tasks, which is closer to financial-market supervision than to product certification. The Bank of England's April directive to the FCA on agentic AI in payments, carried elsewhere in this update, proceeds from the same premise.
