LLM-as-a-Discriminator: When Synthetic Tables Still Look Real

In three linesPrivacy audit method for synthetic tabular data using LLMs (LLaMA, Gemini) as REAL/SYNTHETIC discriminators. Tests on CTGAN, TVAE, Gaussian Copula with UCI Adult and ACS Census datasets (451 trials). LLaMA reaches 0% DRS on Adult, Gemini 100% for CTGAN/TVAE. Code released.

Summary generated by Claude — human-verified