What is a Token in AI?

In AI, especially in language models like ChatGPT, Gemini a token is like a small piece of text that the AI uses to understand and generate language. Think of it as the building block of sentences. A token is a small piece of text that AI reads and processes. When you type a sentence, AI doesn’t read it all at once, it breaks it down into tokens to understand and generate responses.


Example

Let’s take this sentence:

1I love AI.

This might be broken into these tokens:

  • I
  • love
  • AI
  • .

👉 So, the sentence has 4 tokens.


Why Tokens Matter

AI models like ChatGPT don’t process full sentences directly. They break text into tokens and handle one token at a time. That’s how they "read" and "write."


What Can Be a Token?

A token can be:

  • A whole word (like hello)
  • A part of a word (like un, believ, able)
  • Punctuation (like . or !)
  • Spaces (sometimes)

Summary

A token is a small chunk of text (like a word or part of a word) that AI models use to understand and generate language. It’s how AI reads and communicates—one piece at a time.

Token Pricing Questions

If one million tokens cost $0.15 for input and $0.60 for output, and a 300 word essay uses about 300 tokens for the essay plus 10 tokens for the input prompt (ignoring cached tokens), how many essays can you create for $1?

Answer:
Let's break down the cost for one essay:

  1. Input Tokens:

    • Cost per million tokens: $0.15
    • Tokens used: 10
    • Cost = 10 × ($0.15 / 1,000,000) = $0.0000015
  2. Output Tokens:

    • Cost per million tokens: $0.60
    • Tokens used: 300
    • Cost = 300 × ($0.60 / 1,000,000) = $0.00018
  3. Total Cost per Essay:

    • Total = $0.0000015 + $0.00018 = $0.0001815
  4. Number of Essays for $1:

    • Essays = $1 / $0.0001815 ≈ 5500

So, for $1, you can create approximately 5500 essays.


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