Definition
Plain language
A trick where the AI first writes a short old-fashioned paragraph, then rewrites the real text to match that style.
As stated in the literature
A two-call evasion attack that generates a period-register template paragraph and rewrites the target text in that register, pushing it out of a detector's training distribution.
Also called: synth anchor
Why it matters: It shows how shifting text into an unusual style can push it into a detector's blind spots, revealing a weakness in tools that assume a familiar writing register.
For example, the AI first writes a paragraph in flowery Victorian style, then rewrites a modern passage to imitate that same style so it no longer reads as machine-written.
Heard on the show
“The main attack — they call it synth-anchor — is two API calls.”Episode 220 — Write Like It's 1923: The One-Prompt Trick That Beats AI Detectors