{
  "schema_version": "1.0",
  "id": "archive:https://www.anthropic.com/news/redeploying-fable-5",
  "slug": "redeploying-fable-5-165048y",
  "url": "https://feed7.dev/p/redeploying-fable-5-165048y",
  "title": "Announcements",
  "why_included": "Fable 5 is back globally as of July 1 after US export controls (June 12–30) triggered by an Amazon-discovered jailbreak; a new classifier blocks the technique in over 99% of cases.",
  "summary": "**The gist** Anthropic restored global access to **Fable 5 on July 1, 2026**, after US export controls suspended it on **June 12** — three days post-launch. Amazon researchers had jailbroken it into producing exploit-demonstration code for a software vulnerability; Anthropic's testing found **Opus 4.8, GPT-5.5, and Kimi K2.7** could produce the same demonstration. A new classifier blocks the technique in **over 99%** of cases.",
  "practical_implication": "**Why it matters** If Fable 5 vanished from your stack mid-June, this is why, and it is back: Pro, Max, and Team plans get it within up to **50% of weekly limits through July 7**, then via usage credits. The episode also shows how fast a government can pull a frontier model — a fallback model in any production harness is no longer paranoia.",
  "agent_context": "**The gist** Anthropic restored global access to **Fable 5 on July 1, 2026**, after US export controls suspended it on **June 12** — three days post-launch. Amazon researchers had jailbroken it into producing exploit-demonstration code for a software vulnerability; Anthropic's testing found **Opus 4.8, GPT-5.5, and Kimi K2.7** could produce the same demonstration. A new classifier blocks the technique in **over 99%** of cases.\n\n**Why it matters** If Fable 5 vanished from your stack mid-June, this is why, and it is back: Pro, Max, and Team plans get it within up to **50% of weekly limits through July 7**, then via usage credits. The episode also shows how fast a government can pull a frontier model — a fallback model in any production harness is no longer paranoia.\n\n**Watch out** **Mythos 5**, the fewer-safeguards variant, stays restricted to approved **US organizations** under the Glasswing program, and Fable 5's enlarged safety margin — more false-positive refusals on security-adjacent work — remains in place.",
  "source": {
    "name": "Anthropic",
    "url": "https://www.anthropic.com/news/redeploying-fable-5",
    "published_at": null
  },
  "source_class": "blog_post",
  "content_type": "Engineering Post",
  "layer": "model",
  "domains": [
    "security"
  ],
  "topics": [
    "model-selection"
  ],
  "verification": {
    "status": "official_source",
    "label": "Official Source",
    "method": "source_feed",
    "verified_at": null
  },
  "uncertainty": [
    "**Mythos 5**, the fewer-safeguards variant, stays restricted to approved **US organizations** under the Glasswing program, and Fable 5's enlarged safety margin — more false-positive refusals on security-adjacent work — remains in place."
  ],
  "lifecycle": "Current",
  "published_at": null,
  "modified_at": null,
  "supersedes": [],
  "expires_at": null,
  "formats": {
    "html": "https://feed7.dev/p/redeploying-fable-5-165048y",
    "json": "https://feed7.dev/p/redeploying-fable-5-165048y.json",
    "markdown": "https://feed7.dev/p/redeploying-fable-5-165048y.md"
  }
}