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How ChatGPT learns and why it sometimes gets things wrong

June 7, 2025•Becca Caddy•Original Link•2 minutes
Artificial Intelligence
ChatGPT
Machine Learning

Exploring the sources of ChatGPT's knowledge and the reasons behind its occasional inaccuracies

An AI face in profile against a digital background. (Image credit: Shutterstock / Ryzhi)

ChatGPT, OpenAI's large language model (LLM), often appears to know everything—but it doesn't. While it can generate fluent, informed responses, it lacks true understanding and sometimes produces incorrect or fabricated information, a phenomenon known as hallucinating.

How ChatGPT Works

At its core, ChatGPT functions like an advanced autocomplete tool. It predicts the next word in a sequence based on patterns learned from vast amounts of training data, including books, articles, websites, and public forums like Reddit. However, its knowledge is limited to the data it was trained on, and some models don't access real-time information unless they have browsing capabilities.

Sources of ChatGPT's Knowledge

ChatGPT's training data includes:

  • Books and academic papers
  • Publicly available websites and forums
  • Wikipedia pages
  • Open-source code repositories

Despite its broad training, ChatGPT hasn't read private or restricted content. However, ethical concerns persist about the use of shadow libraries and copyrighted material in AI training.

Why ChatGPT Sounds Convincing

ChatGPT excels at mimicking human language patterns, making its responses sound natural and authoritative. This fluency, combined with its ability to remember past conversations, creates the illusion of deep knowledge. Yet, it can also reflect biases and inaccuracies present in its training data.

Limitations and Risks

  • Outdated Information: Some models have knowledge cutoffs (e.g., GPT-4o's data ends in June 2024).
  • Confidence Without Accuracy: ChatGPT often delivers answers with unwavering confidence, even when incorrect.
  • Bias Propagation: It may replicate societal biases found in its training data.

Using ChatGPT Wisely

While ChatGPT is a powerful tool for drafting, summarizing, and brainstorming, users should:

  • Verify facts independently
  • Be aware of its limitations
  • Understand that it doesn't "think" like a human

For more on AI hallucinations, visit this link.

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  • Replacing to-do lists with ChatGPT

By Becca Caddy, TechRadar contributor

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About the Author

Dr. Emily Wang

Dr. Emily Wang

AI Product Strategy Expert

Former Google AI Product Manager with 10 years of experience in AI product development and strategy formulation. Led multiple successful AI products from 0 to 1 development process, now provides product strategy consulting for AI startups while writing AI product analysis articles for various tech media outlets.

Expertise

AI Product Management
User Experience
Business Strategy
Market Analysis
Experience
10 years
Publications
65+
Credentials
2
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