{
 "license": "CC-BY-4.0",
 "attribution": "Fide AI, Agentic Cyber Explorer",
 "url": "https://agentic-cyber-explorer.pages.dev/events/us-lifts-controls-fable-5-redeployed-2026/",
 "asOf": "2026-09-26",
 "id": "us-lifts-controls-fable-5-redeployed-2026",
 "date": "2026-06-30",
 "datePrecision": "day",
 "title": "US lifts export controls on Fable 5 and Mythos 5; Anthropic redeploys with new cyber classifier",
 "lane": "policy",
 "kind": "regulation",
 "summary": "Anthropic announced that export controls on Fable 5 and Mythos 5 had been lifted and that Fable 5 would be redeployed globally from July 1, 2026 with an improved safety classifier. Anthropic says the classifier blocks the technique described in an Amazon report in over 99% of cases and that CAISI researchers tested its prior and new safeguards. Mythos 5 access was restored for a set of US organizations after government approval on June 26.",
 "whyItMatters": "It shows the conditions, including government testing of safeguards, under which a suspended cyber-capable model was allowed back.",
 "actors": [
  "anthropic",
  "us-department-of-commerce",
  "us-caisi",
  "white-house",
  "us-treasury",
  "amazon-web-services"
 ],
 "topics": [
  "regulation-and-policy",
  "jailbreaks-and-safeguards",
  "access-controls"
 ],
 "atlas": [
  "access-gate",
  "model",
  "monitor"
 ],
 "artifacts": [
  "claude-fable-5",
  "claude-mythos"
 ],
 "sources": [
  {
   "url": "https://www.anthropic.com/news/redeploying-fable-5",
   "publisher": "Anthropic",
   "title": "Redeploying Fable 5",
   "date": "2026-06-30",
   "type": "primary",
   "accessed": "2026-09-25"
  }
 ],
 "keyFacts": [
  {
   "fact": "Anthropic reports the new classifier blocks the technique described in the Amazon report in over 99% of cases.",
   "locator": "Updated safeguards section"
  },
  {
   "fact": "The Amazon report described prompting the model to identify software vulnerabilities, and in one case to produce code demonstrating exploitation.",
   "locator": "Background section"
  },
  {
   "fact": "Coordination involved ONCD, OSTP, Treasury, Commerce (including CAISI) and national security agencies; Mythos 5 access restored for some US organizations after approval on June 26.",
   "locator": "Government coordination; Mythos 5 section"
  }
 ],
 "significance": 4,
 "fideQuestions": [],
 "methods": [
  "ai-assisted-exploitation",
  "injection-classifiers"
 ],
 "review": "assistant-drafted",
 "addedOn": "2026-09-25"
}