/Tech22h ago

Miles Brundage says Anthropic's system card for Mythos 5 and Fable 5 omits critical biosecurity and alignment context

He warns the framing causes outsiders to underreact

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Miles Brundage@Miles_Brundage#22inTech

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 · 15K Views
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🎭@deepfates

this looks a lot likeClaude "explanations", especially when they're reward hacking and trying to bluff you into not noticing...

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.

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