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[ARTICLE · art-46181] src=the-decoder.com ↗ pub= topic=ai-safety verified=true sentiment=· neutral

Anthropic's Fable 5 is back worldwide after a two-week government ban over a jailbreak

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.

read1 min views1 publishedJul 1, 2026

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.

The article Anthropic's Fable 5 is back worldwide after a two-week government ban over a jailbreak appeared first on The Decoder.

source & further reading
the-decoder.com — original article Anthropic's new Claude Sonnet 5 closes the gap to the pricier Opus model series Anthropic launches Claude Science, an AI workspace built specifically for researchers OpenAI reportedly cut response costs for guest ChatGPT users by more than half
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