Artificial intelligence, in plain words.

No language model reads words. It reads tokens — fragments of text with a number attached. Understand that one thing and the rest starts falling into place.

o200k_baseGPT-4o · GPT-5

What is artificial intelligence?

Whatisartificialintelligence?

This is what the sentence looks like when a machine reads it. Each piece is one token.

token10346

Why token?

Because it is the smallest unit artificial intelligence works with — and the word “token” is itself exactly one token. Number 10346. That is where the name comes from, and where we start.

Measured in o200k_base, the encoding GPT-4o and GPT-5 use.

Estonian costs more in AI

The same meaning, three languages. The machine sees them at very different lengths — and tokens are what you pay for.

o200k_basecharacters per token · ×
Eesti
65
3.261.44×
English
45
5.001.00×
Русский
48
4.401.07×

The same content takes roughly one and a half times more tokens in Estonian than in English. That means a higher API bill and a context window that fills up sooner.

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Short answers

Do I need to understand AI in order to use it?

No. But knowing how it works makes you ask better and spot a wrong answer faster. Most disappointment with AI comes from wrong expectations rather than a bad tool.

What is a token, in one sentence?

A token is a piece of text — usually a word, part of a word, or a punctuation mark — that a language model turns into a number so it can compute with it.

Does ChatGPT speak Estonian?

Yes, and increasingly well. Estonian is simply more expensive for the machine: the same meaning costs more tokens than English, so you reach the limits sooner.

Does my data stay inside the AI?

It depends on the service and the settings. Free consumer versions often use conversations for training; business accounts usually do not. Sensitive information should never be pasted in blindly.