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Developer finds LLMs treat system prompts as data, not instructions

A developer discovered that large language models, specifically the Flash Onyx model, interpret system prompts not as instructions but as data that influences their output. This means that examples or phrases within the prompt can be directly incorporated into the model's responses, even if intended as negative examples or rules. The developer found that deleting problematic phrases or examples from the prompt was more effective than explicitly instructing the model not to use them. Additionally, the developer emphasizes the importance of testing prompts across multiple random seeds to distinguish genuine model behavior from random chance, and suggests that concrete examples are more effective than abstract principles for guiding model output. AI

IMPACT Understanding how LLMs process system prompts can lead to more effective prompt engineering and better control over model outputs.

RANK_REASON Developer's personal discovery and methodology for prompt engineering.

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Developer finds LLMs treat system prompts as data, not instructions

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Developer's personal discovery and methodology for prompt engineering.
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39 days old
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  1. dev.to — LLM tag TIER_1 English(EN) · Nathan C. ·

    Your system prompt isn't instructions. It's data.

    <p>My system prompt had an example of a good Slack message in it. It opened with "Morning all, quick one:".</p> <p>The model started opening real Slack drafts with that exact phrase. Then it started saying "Morning." when I typed "hey", which is a small lie, because it cannot see…