{"slug": "anthropic-s-fable-5-is-back-worldwide-after-a-two-week-government-ban-over-a", "title": "Anthropic's Fable 5 is back worldwide after a two-week government ban over a jailbreak", "summary": "Anthropic's Fable 5 is back on the global market after a two-week ban by the US government over a jailbreak exploit discovered by Amazon researchers. Anthropic claims smaller models like Claude Haiku 4.5 could also execute the exploit, but a new safety classifier blocks it in over 99% of cases, albeit with increased false positives.", "body_md": "After a two-week ban, the US government is letting Anthropic ship Fable 5 globally again. Amazon researchers had found a jailbreak, but Anthropic says even much smaller models like Claude Haiku 4.5 could pull off the same exploit. A new safety classifier blocks the technique in over 99 percent of cases, though it also flags more harmless requests in the process.\n\nThe article [Anthropic's Fable 5 is back worldwide after a two-week government ban over a jailbreak](https://the-decoder.com/anthropics-fable-5-is-back-worldwide-after-a-two-week-government-ban-over-a-jailbreak/) appeared first on [The Decoder](https://the-decoder.com).", "url": "https://wpnews.pro/news/anthropic-s-fable-5-is-back-worldwide-after-a-two-week-government-ban-over-a", "canonical_source": "https://the-decoder.com/anthropics-fable-5-is-back-worldwide-after-a-two-week-government-ban-over-a-jailbreak/", "published_at": "2026-07-01 07:40:29+00:00", "updated_at": "2026-07-01 07:57:07.090758+00:00", "lang": "en", "topics": ["ai-safety", "large-language-models", "ai-policy"], "entities": ["Anthropic", "Fable 5", "Amazon", "Claude Haiku 4.5", "US government"], "alternates": {"html": "https://wpnews.pro/news/anthropic-s-fable-5-is-back-worldwide-after-a-two-week-government-ban-over-a", "markdown": "https://wpnews.pro/news/anthropic-s-fable-5-is-back-worldwide-after-a-two-week-government-ban-over-a.md", "text": "https://wpnews.pro/news/anthropic-s-fable-5-is-back-worldwide-after-a-two-week-government-ban-over-a.txt", "jsonld": "https://wpnews.pro/news/anthropic-s-fable-5-is-back-worldwide-after-a-two-week-government-ban-over-a.jsonld"}}