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model-organisms

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Can a useful KV-cache Cartridge hide a working backdoor trigger, and can a defender catch it? Toy-scale model organism: joint training hides it, the trigger over-fires a lexical zone, and an activation monitor catches it in the act but never at rest. Qwen3-4B, single GPU.

  • Updated Aug 9, 2026
  • Python

Detection audit of three Qwen2.5-7B "secret loyalty" organisms (Apart Research, Jul 2026). One is byte-identical to base; the other two carry a rank-16, attention-only delta. Ten arms tested for a covert principal — none survived a second control. What we found instead: a replicated safety regression in B model organism.

  • Updated Jul 27, 2026
  • Jupyter Notebook

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