Research Training And DistillationResearch Item

Prompt injection into LLM judges for grades and evaluation

April 5, 2026Ethan Mollick

Ethan Mollick reports tests where hidden prompts in letters and papers can manipulate LLM graders on older and smaller models but not most frontier models. The implication is evaluation pipelines need model-aware defenses.

“Can you prompt inject your way to an “A”?”
“people are inserting AI prompts into letters, CVs & papers.”
“It does on older & smaller models, but not on most frontier AI”
Ethan Mollick
evaluationsecurityllm

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