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Fable 5 Pwned: Inside the First Mythos-Class Leak

Syed Ahmer Shah on June 12, 2026

The post hit X at some point on June 10, the morning after Anthropic's biggest launch in years. I was honestly expecting something like this. The ...
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Syed Ahmer Shah The Silicon Architect •

Precisely. If Pliny's prompt skipped the routing completely, the upstream classifier didn't even flag it as a risk. It shows that the entire multi-model defense architecture is completely reliant on a fragile frontend categorization step.

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Syed Ahmer Shah The Silicon Architect •

It looks like raw parameter scaling is hitting a point of diminishing returns for pure logic tasks, whereas Anthropic’s heavy focus on algorithmic routing and agentic reasoning loops is yielding massive dividends.