Publié : 11 December 2025
Actualisé : 5 hours ago
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📋 Table of Contents
Tired of ChatGPT’s imprecise and lengthy answers? Discover how structured prefixes can radically transform the quality and format of responses, making you a true AI architect.
✨ Prompt Engineering for Everyone
ChatGPT’s effectiveness largely depends on the quality of your prompts. However, few users fully exploit the potential of structured prefixes. These natural language instructions act as tags, guiding the model towards the desired type of reasoning, format, and level of detail.
The idea is simple: instead of asking a raw question, frame it with a prefix that explicitly states your expectation. This is a form of “prompt engineering” accessible to all, which allows you to obtain more relevant and tailored answers.
Key Point: Structured prefixes are natural language instructions that improve the quality of ChatGPT’s responses.
Of course, the effectiveness of these prefixes may vary. It depends on the context, the complexity of your question, and the overall wording of your prompt. Experimentation is therefore essential to find what works best in your specific use case.
✍️ Reformatting Responses: A Practical Guide
Fed up with answers that are too long or poorly structured? These prefixes allow you to impose a specific format from the start, avoiding unnecessary back and forth.
- /ELI5: Explain in a very simple and accessible way (Explain Like I’m 5). Ideal for popularizing a complex concept. Example:
/ELI5: How does string theory work? - /FORMAT AS: Impose a specific format (table, JSON, etc.). Example:
/FORMAT AS JSON: List the currencies of the world - /CHECKLIST: Transform the answer into a checklist. Example:
/CHECKLIST: Preparing a colleague's retirement party - /EXEC SUMMARY: Presents a structured summary, perfect for a professional report. Example:
/EXEC SUMMARY: Trends in French ecommerce in 2025 - /COMPARE: Places two or more elements side by side to facilitate comparison. Example:
/COMPARE: Symfony vs Laravel as PHP frameworks - /STEP-BY-STEP: Breaks down into clear and sequenced steps. Example:
/STEP-BY-STEP: How to create a viral Instagram post? - /TLDL: Summarizes in a few essential lines (Too long, didn’t listen). Example:
/TLDL: Explain the formation of black holes - /SCHEMA: Generates a structured plan or model. Example:
/SCHEMA: Structure of the process of stocking an item - /BRIEFLY: Forces a very concise answer. Example:
/BRIEFLY: Summarize this concept - /BEGIN WITH or /END WITH: Forces a specific beginning or end. Example:
/BEGIN WITH: "Hello" / END WITH: "Sincerely"
🧠 Pushing Reflection Further
When faced with technical or strategic questions, ChatGPT can sometimes offer answers that are too quick or lack depth. These commands force the model to slow down, break down the problem, and explore different perspectives.
/ELI5
📊 Summary Table of Useful Prefixes
| Prefix | Description | Example of use |
|---|---|---|
| /ELI5 | Simple explanation | /ELI5: How does an internal combustion engine work? |
| /FORMAT AS JSON | JSON format | /FORMAT AS JSON: List of the 10 largest cities in the world |
| /EXEC SUMMARY | Executive summary | /EXEC SUMMARY: Analysis of the electric vehicle market in Europe |
Note: The use of these prefixes is not a 100% guarantee of success. Experiment and adapt the prompts to your context.
The key to getting quality answers from ChatGPT lies in the precision and clarity of your instructions.
By mastering the art of prefixes, you will transform ChatGPT into a powerful and personalized tool, capable of precisely meeting your needs. So, to your prompts!
❔ Frequently Asked Questions
What is a prefix in ChatGPT and why is it important?
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