Sometimes AI Makes Up Code That Doesn't Actually Work
AI can invent function names that look real but aren't — always test the code.
5 min · Reviewed 2026
The big idea
AI is so confident that it sometimes invents code that LOOKS right but won't run. It might call a function that doesn't exist or use a tool the wrong way.
Some examples
AI says 'use the magicSort() function' — but no such function exists.
Code looks perfect but throws an error the second you run it.
AI might mix up two different programming languages.
Always run the code to see if it actually works.
Try it!
Ask AI for a tiny program. Try to run it. If it errors, ask AI to fix it. Try again.
End-of-lesson check
15 questions · take it digitally for instant feedback at tendril.neural-forge.io/learn/quiz/end-explorers-ai-coding-AI-and-spotting-fake-code
What is the core idea behind "Sometimes AI Makes Up Code That Doesn't Actually Work"?
AI can invent function names that look real but aren't — always test the code.
monorepo
AI chatbots can't actually run your code — they pattern-match what code usually …
Copilot Chat suggests two extra tests you didn't think of when you ask 'what edg…
Which term best describes a foundational idea in "Sometimes AI Makes Up Code That Doesn't Actually Work"?
testing
hallucination
verification
monorepo
A learner studying Sometimes AI Makes Up Code That Doesn't Actually Work would need to understand which concept?
hallucination
verification
testing
monorepo
Which of these is directly relevant to Sometimes AI Makes Up Code That Doesn't Actually Work?
hallucination
testing
monorepo
verification
Which of the following is a key point about Sometimes AI Makes Up Code That Doesn't Actually Work?
AI says 'use the magicSort() function' — but no such function exists.
Code looks perfect but throws an error the second you run it.
AI might mix up two different programming languages.
Always run the code to see if it actually works.
Which of these does NOT belong in a discussion of Sometimes AI Makes Up Code That Doesn't Actually Work?
AI says 'use the magicSort() function' — but no such function exists.
Code looks perfect but throws an error the second you run it.
monorepo
AI might mix up two different programming languages.
What is the key insight about "The rule" in the context of Sometimes AI Makes Up Code That Doesn't Actually Work?
monorepo
AI chatbots can't actually run your code — they pattern-match what code usually …
Looks real isn't the same as IS real — always test!
Copilot Chat suggests two extra tests you didn't think of when you ask 'what edg…
Which statement accurately describes an aspect of Sometimes AI Makes Up Code That Doesn't Actually Work?
monorepo
AI chatbots can't actually run your code — they pattern-match what code usually …
Copilot Chat suggests two extra tests you didn't think of when you ask 'what edg…
AI is so confident that it sometimes invents code that LOOKS right but won't run.
What does working with Sometimes AI Makes Up Code That Doesn't Actually Work typically involve?
Ask AI for a tiny program. Try to run it. If it errors, ask AI to fix it. Try again.
monorepo
AI chatbots can't actually run your code — they pattern-match what code usually …
Copilot Chat suggests two extra tests you didn't think of when you ask 'what edg…
Which best describes the scope of "Sometimes AI Makes Up Code That Doesn't Actually Work"?
It is unrelated to ai-coding workflows
It focuses on AI can invent function names that look real but aren't — always test the code.
It applies only to the opposite professional tier
It was deprecated in 2024 and no longer relevant
Which section heading best belongs in a lesson about Sometimes AI Makes Up Code That Doesn't Actually Work?
monorepo
AI chatbots can't actually run your code — they pattern-match what code usually …
Some examples
Copilot Chat suggests two extra tests you didn't think of when you ask 'what edg…
Which section heading best belongs in a lesson about Sometimes AI Makes Up Code That Doesn't Actually Work?
monorepo
AI chatbots can't actually run your code — they pattern-match what code usually …
Copilot Chat suggests two extra tests you didn't think of when you ask 'what edg…
Try it!
Which of the following is a concept covered in Sometimes AI Makes Up Code That Doesn't Actually Work?
hallucination
testing
verification
monorepo
Which of the following is a concept covered in Sometimes AI Makes Up Code That Doesn't Actually Work?
hallucination
testing
verification
monorepo
Which of the following is a concept covered in Sometimes AI Makes Up Code That Doesn't Actually Work?