{
 "license": "CC-BY-4.0",
 "attribution": "Fide AI, Agentic Cyber Explorer",
 "url": "https://agentic-cyber-explorer.pages.dev/events/anthropic-asl3-activation-claude-opus-4-2025/",
 "asOf": "2026-09-26",
 "id": "anthropic-asl3-activation-claude-opus-4-2025",
 "date": "2025-05-22",
 "datePrecision": "day",
 "title": "Anthropic activates ASL-3 deployment and security protections for Claude Opus 4",
 "lane": "capability",
 "kind": "threshold",
 "summary": "Anthropic activated ASL-3 protections for Claude Opus 4 as a precaution because it could not rule out ASL-3 CBRN risk; the announcement does not cite cyber capability as the trigger. The ASL-3 security standard it describes includes more than 100 controls to protect weights, two-party authorization for weight access, and egress bandwidth controls against exfiltration.",
 "whyItMatters": "It was a public activation of a higher safety level under a lab framework, and its egress and access controls are defenses against cyber theft of model weights.",
 "actors": [
  "anthropic"
 ],
 "topics": [
  "capability-thresholds",
  "access-controls",
  "data-exfiltration"
 ],
 "atlas": [
  "model",
  "credentials"
 ],
 "artifacts": [
  "claude-opus-4"
 ],
 "sources": [
  {
   "url": "https://www.anthropic.com/news/activating-asl3-protections",
   "publisher": "Anthropic",
   "title": "Activating AI Safety Level 3 Protections",
   "date": "2025-05-22",
   "type": "primary",
   "accessed": "2026-09-25"
  }
 ],
 "keyFacts": [
  {
   "fact": "Trigger was CBRN-related: Anthropic said clearly ruling out ASL-3 risks was not possible for Claude Opus 4.",
   "locator": "Announcement, rationale"
  },
  {
   "fact": "Security measures include over 100 controls, two-party authorization for weight access, egress bandwidth controls and binary allowlisting on endpoints.",
   "locator": "Security measures section"
  }
 ],
 "significance": 2,
 "fideQuestions": [],
 "methods": [
  "agent-data-exfiltration",
  "capability-restriction"
 ],
 "review": "assistant-drafted",
 "addedOn": "2026-09-25"
}