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.

Try Open AI Tokenizer

Types of Tokens

There are generally 3 types of tokens:

1. Input Tokens: Text or input that the AI model receives.
2. Cached Tokens: Text that the AI model has already processed.
3. Output Tokens: Text or output that the AI model generates.

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(Suppose) 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 ≈ 5509.64

So, for $1, you can create approximately 5509 essays.

Video Explanation

Watch a video on what is a token in AI to understand it better.

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