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[ARTICLE · art-34049] src=thezvi.substack.com ↗ pub= topic=ai-safety verified=true sentiment=↓ negative

Claude Fable 5 and Mythos 5: Capabilities

Anthropic was forced by the United States Government to take Claude Fable 5 offline just three days after its release, following the discovery of a jailbreak. The government intervention marked a shift from previous stances where jailbreaks were considered inevitable by experts.

read1 min views1 publishedJun 19, 2026

Only three days after the release of Claude Fable 5, Anthropic was forced by the United States Government to make it unavailable, when a jailbreak was brought to its attention, rather than the previous situation of ‘yes obviously experts can jailbreak anything if they care enough’ and ‘yes obviously you can ask Fable to fix your code.’

source & further reading
thezvi.substack.com — original article American Government Takes Down Claude Fable
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