/Tech22h ago

Anthropic System Card Flags High Bio Weapon Risks In Mythos And Fable Models

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Miles Brundage@Miles_Brundage#22inTech

https://www-cdn.anthropic.com/d00db56fa754a1b115b6dd7cb2e3c342ee809620.pdf

Miles Brundage@Miles_Brundage

People outside of AI don't freak out quite enough in response to new system cards because, even if they do read them, there is a lot of unstated context missing...

For example, here is some context on one paragraph in the executive summary of today's Fable/Mythos card.

5:09 PM · Jun 9, 2026 · 1.9K Views
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Miles Brundage@Miles_Brundage

(this is not a criticism of the system card, which is not primarily intended for a mass audience - it's 300 pages long. And Anthropic has gotten better about having clear/concise, if still expert-oriented, executive summaries. Just noting the situation)

Miles Brundage@Miles_Brundage

https://www-cdn.anthropic.com/d00db56fa754a1b115b6dd7cb2e3c342ee809620.pdf

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Miles Brundage@Miles_Brundage

Yep, I used the short version because since per Ant they are close enough/they framed this as a minor change, but for the record re: official version, see:

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Violeta Insights@violetainsights

@Miles_Brundage Usually nobody reads 300 pages. The exec summary is what gets pasted into the procurement memo and sent up the approval chain.

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