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WorkshopyOfficial9 stepsQuiz8 interactiveDiagram~65 min
gitversion controlbeginners
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- Official
- Beginner
- English
- About 75 min
- 10 steps · 2 quizzes
How ChatGPT Works — Tokens, Predictions & Hallucinations
A hands-on first look inside large language models (LLMs) like ChatGPT, Claude and Gemini — no maths, no code. Each step adds one idea, and each idea comes with
- Free
- No account needed
- Stop any time, pick up where you left off
WorkshopyOfficial
9 lessons · used by 2 teachers
For teachers
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- Students join with a code — no accounts
- See who’s done and who’s stuck, step by step
- It’s your copy — change anything before class
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Your path
10 steps · 2 quizzes · about 75 minutes · open any step
- It's a very good autocompleteStart hereYour phone's keyboard guesses your next word.InteractiveHands-on · 6 min
- Text becomes tokensA model can't read letters.InteractiveHands-on · 6 min
- Tokens become a map of meaningEach token ID is turned into a long list of numbers called an embedding — its address on a giant map of meaning.InteractiveHands-on · 6 min
- Attention: words look at each otherThe same word can mean different things: a river bank isn't a money bank.InteractiveHands-on · 6 min
- The output: a chance for every tokenAfter all that, the model gives every token it knows (about 100,000) a chance of coming next.InteractiveHands-on · 6 min
- Temperature: how bold is the pick?Always taking the tallest bar is safe but dull.InteractiveHands-on · 6 min
- Check: tokens and predictionsQuiz · 4 questions
- One token at a time: the loopNow put the pieces together.InteractiveHands-on · 8 min
- How it learned: guess, check, adjustWhere do the chances come from?InteractiveHands-on · 7 min
- Hallucinations: fluent isn't trueThe model writes the most plausible-sounding next token — even when it has no idea.InteractiveHands-on · 7 min
Using it
Workshopy shares this lesson under CC BY 4.0. Anyone may use and change it, with credit to you. Anyone can learn it here, free. A copy in your workspace is yours to change and run live; your students never need an account.
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