AI glossary · Chatbots and assistants
Custom GPT
A custom GPT is a version of ChatGPT set up for one purpose, with its own instructions, files and tools, that you can build without coding and share.
Also called GPTs, custom chatbot
In more detail
You give it a name, a system prompt that describes how it should behave, optional reference files and actions it can take. Others can then use it from the GPT store or a link.
Other assistants offer similar features, such as Gems in Gemini and Projects in Claude.
Example
A teacher builds a custom GPT that quizzes students on a textbook chapter without giving away the answers.
Related terms
ChatGPTChatGPT is OpenAI’s AI chatbot. You type or speak a request and it answers, writes, explains, analyses files or creates images.System promptA system prompt is a set of background instructions that shapes how an AI behaves in every reply, such as its role, tone and rules. Users often don’t see it.Custom instructionsCustom instructions are standing preferences you give a chatbot, like your job or preferred style, so it applies them to every conversation.AI assistantAn AI assistant is an AI tool that helps you get things done, such as answering questions, writing, planning or managing tasks, usually through chat or voice.
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