What Is an LLM Context Window? (Explained With Real Hallucination Examples)
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If you've ever had ChatGPT or Claude "forget" something you said earlier in a long chat, or confidently make up a fact that isn't true — you've hit the context window. Let's break down what it actually is, why it exists, and how it directly causes hallucinations. What Is a Context Window? A context window is the amount of text an LLM can "see" and reason about at one time. Think of it as the model's short-term memory or its desk space. Everything the model uses to generate a response — your…
1Key Takeaways
- If you've ever had ChatGPT or Claude "forget" something you said earlier in a long chat, or confidently make up a fact that isn't true — you've hit the context window.
- Let's break down what it actually is, why it exists, and how it directly causes hallucinations.
- A context window is the amount of text an LLM can "see" and reason about at one time.
- Think of it as the model's short-term memory or its desk space.
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. DEV — ML reports that if you've ever had ChatGPT or Claude "forget" something you said earlier in a long chat, or confidently make up a fact that isn't true — you've hit the context window.
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