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Prompt injection detection limits of perplexity

April 6, 2026Trend Micro Research

Trend Micro Research argues perplexity alone can miss prompt injections and that prompt representations improve pre-inference detection, pointing to more robust defenses for agentic and RAG systems.

Prompt injection is not always noisy.
TrendAI™ Research shows why perplexity, a measure of how predictable text is to an LLM, can fail on its own
and why prompt representations improve pre‑inference detection.
Trend Micro Research
prompt injectionsdetectionperplexityllmprompt injections

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