What Is ChatGPT? How It Works, What It Can Do and Its Limits
Kamran Liaquat Ali- posted on
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Quick answer: ChatGPT is an AI chatbot made by OpenAI. You type (or speak) a request in everyday language and it replies with text, code, summaries, images or analysis. It is built on large language models (LLMs) trained on vast amounts of text, which learn to predict and generate useful responses. It is excellent for drafting, explaining and brainstorming, but it can make mistakes, so important facts should always be checked.
How ChatGPT Works
- Pre-training: the underlying model learns patterns of language from a very large collection of text and code.
- Fine-tuning: it is then trained further, including with human feedback, to follow instructions and give helpful, safer answers.
- Generating a reply: when you send a message, the model predicts the response one piece (token) at a time, using your conversation as context.
- Tools: depending on your plan, ChatGPT can also search the web, read uploaded files, run code for data analysis and create images.
ChatGPT does not “look up” answers in a database by default. That is why it can sound confident while being wrong, a problem often called hallucination.
What You Can Use ChatGPT For
| Task | Example request |
|---|---|
| Writing | “Draft a polite email asking a client to approve the invoice.” |
| Learning | “Explain dependency injection in ASP.NET Core with a simple example.” |
| Coding | “Find the bug in this C# method and explain the fix.” |
| Summarising | “Summarise this PDF report in five bullet points.” |
| Planning | “Create a four-week study plan for learning SQL.” |
| Data | “Analyse this CSV and chart monthly sales.” |
Developers often use it alongside dedicated tools; see our comparison of AI coding assistants.
Free and Paid Plans
ChatGPT has a free tier with access to capable models and usage limits, and paid plans for individuals, teams and enterprises that add higher limits, more advanced models and extra features. Plan names, prices and limits change regularly, so check OpenAI’s pricing page for current details.
Limitations to Know
- Errors and hallucinations: it can invent facts, quotes or references. Verify anything important.
- Out-of-date knowledge: without web search it only knows what was in its training data.
- Privacy: avoid pasting passwords, personal data or confidential business information; review the data and memory settings.
- Bias: responses can reflect biases in training data.
- Not a professional: it is not a substitute for a doctor, lawyer or financial adviser.
Tips for Better Results
- Give context: who you are, the goal and the audience.
- Be specific about format, for example “a table with three columns” or “under 150 words”.
- Provide examples of what you want.
- Ask it to show its reasoning or list assumptions, then check them.
- Iterate: refine the answer with follow-up instructions instead of starting over.
ChatGPT and Other AI Assistants
ChatGPT competes with assistants such as Google Gemini, Anthropic’s Claude and Microsoft Copilot. They differ in strengths, integrations and pricing, but all are based on large language models. Newer “agentic” features let these assistants carry out multi-step tasks; read our guide to agentic AI to learn how that works.
Frequently Asked Questions
Who created ChatGPT?
ChatGPT was created by OpenAI and launched to the public in November 2022.
Is ChatGPT free?
Yes, there is a free plan with limits. Paid plans offer more usage and advanced features.
Can ChatGPT replace programmers or writers?
It speeds up many tasks, but people are still needed to define problems, check accuracy and take responsibility for the final work. Our article on how AI is changing jobs looks at this in more detail.
Does ChatGPT remember my conversations?
It remembers the current conversation, and with memory features turned on it can recall some details across chats. You can view and manage this in the settings.
Explore more in our technology and AI guide.
