Audit at the Precision You Deploy: Quantization Reshapes a Subliminally Learned Preference

Md Rayhanul Masud, Mst Suraiya Akter Shefa

Subliminal learning allows AI models to inherit hidden preferences from seemingly unrelated training data, such as number sequences. Safety audits may evaluate models at standard 16-bit precision, while deployments may use compressed, quantized weights. We ask whether quantization changes the expression of a subliminal preference and what drives any resulting change. To investigate, we implant a "favourite animal: panda" preference into Qwen2.5-7B-Instruct. We define its net strength as the difference in mean panda-answer probability between subliminal models and neutrally trained controls under the same quantization setting. Applying this metric across different compression levels reveals a stark contrast. While behaviour remains stable at 8 bits, 4-bit quantization triggers severe, opposing shifts depending on the quantizer. Half-Quadratic Quantization (HQQ) amplifies the preference, raising the subliminally trained model's panda probability from roughly 55% at 16 bits to 64% at 4 bits, while the controls stay near 17%. This raises the trait's net strength ~1.3 times its 16-bit value. In contrast, NormalFloat (NF4) at 4-bit suppresses it, shrinking the net strength to just ~0.3…