Skip to content
AI IntelligenceAug 13, 2026Practical Tip
Article

Researchers can now reverse-engineer LLM prompts from output text with near-perfect accuracy

Frontier EditorialSource: The Decoder
01

Source Brief

Researchers can now reverse-engineer LLM prompts from output text with near-perfect accuracy

02

Practical Tip

Researchers at IIT Bombay and Adobe Research have built an inverse language model that reconstructs the original prompt from an LLM's output with near-perfect accuracy. Their method, called "Previous-Token Prediction," doesn't need access to model weights and works across different models. For companies relying on proprietary system prompts, this could be a serious security risk. The article Researchers can now reverse-engineer LLM prompts from output text with near-perfect accuracy appeared first on The Decoder .