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Prompts have evil twins

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abstract

We discover that many natural-language prompts can be replaced by corresponding prompts that are unintelligible to humans but that provably elicit similar behavior in language models. We call these prompts "evil twins" because they are obfuscated and uninterpretable (evil), but at the same time mimic the functionality of the original natural-language prompts (twins). Remarkably, evil twins transfer between models. We find these prompts by solving a maximum-likelihood problem which has applications of independent interest.

fields

cs.CL 1

years

2026 1

verdicts

CONDITIONAL 1

representative citing papers

Prompt Compression via Activation Aggregation

cs.CL · 2026-07-09 · conditional · novelty 6.0

A learned weighted sum of intermediate-layer activations compresses an instruction prompt into a single patch vector that, injected at an early layer, recovers task accuracy within ~2% of the full prompt.

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  • Prompt Compression via Activation Aggregation cs.CL · 2026-07-09 · conditional · none · ref 14 · internal anchor

    A learned weighted sum of intermediate-layer activations compresses an instruction prompt into a single patch vector that, injected at an early layer, recovers task accuracy within ~2% of the full prompt.