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Building Your First Custom GPT

🧩 Custom GPTs & GPT Store 20 min 200 BASE XP

What is a Custom GPT?

A Custom GPT is a tailored version of ChatGPT designed for a specific purpose. You don't need to write code to build one; you just configure it using natural language.

The Configuration Panel

  • Instructions: The core prompt that dictates the GPT's behavior, tone, and constraints.
  • Conversation Starters: Suggested prompts to help users get started.
  • Knowledge Base: Upload files (PDFs, docs, CSVs) that the GPT can reference via Retrieval-Augmented Generation (RAG).
  • Capabilities: Toggle Web Browsing, DALL-E Image Generation, and Code Execution on or off.

Writing Solid Instructions

A great Custom GPT instruction block uses markdown for structure. Define the Role, Rules, Workflow, and Output Format clearly.

# Role
You are an expert technical reviewer.

# Rules
- Never rewrite the code automatically.
- Only point out security vulnerabilities and performance bottlenecks.
- Be concise and direct.

# Output Format
Always respond with a bulleted list of issues.
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How does a Custom GPT use uploaded files in its Knowledge Base?
It fine-tunes the base model on them
It uses Retrieval-Augmented Generation (RAG) to search the documents when answering
It memorizes them permanently
It translates them into Python code