Frontier LLMs leak prompted secret information thematically in generated stories at rates up to 79% above chance in binary discrimination tests, even when told to hide it, with leakage scaling by model size and vanishing for short-form outputs.
Has my system prompt been used? Large language model prompt membership inference.arXiv preprint arXiv:2502.09974
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Can You Keep a Secret? Involuntary Information Leakage in Language Model Writing
Frontier LLMs leak prompted secret information thematically in generated stories at rates up to 79% above chance in binary discrimination tests, even when told to hide it, with leakage scaling by model size and vanishing for short-form outputs.