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AI Glossary

Know Before You Use

10 posts

On-Device AI — AI That Runs Without the Internet

What on-device AI, where a smartphone's or laptop's own chip handles AI computation without an internet connection, actually is, how it differs from cloud AI, and how practical it is, based on 2026 chipset specs and market data.

Know Before You Use· 5 min

Benchmarks — Can You Trust "#1 in AI Performance"?

A number-one benchmark score may come from a model that saw the exam in advance, or from an exam unrelated to your work. Through the 2026 retirement of SWE-bench and the LM Arena controversy, here are six principles for reading scores.

Know Before You Use· 7 min

Parameters — 70B, 405B… What Do These Numbers Mean?

The B after a model's name is not a report card; it is closer to a hardware requirements sheet. Read this number as a performance ranking and your model choice is almost guaranteed to be wrong.

Know Before You Use· 10 min

What is AI hallucination?

Hallucination is not the result of AI 'breaking'. It is closer to a structural side effect: today's training and evaluation methods award more points for a plausible guess than for saying 'I don't know'. Once you understand the mechanism, the way you deal with it changes too.

Know Before You Use· 9 min

Context window — why AI forgets what you just said

"I just told you that." If you have ever said this to an AI, you have met the context window. AI does not have a bad memory; it never remembers in the first place. Here is why this happens.

Know Before You Use· 8 min

Tokens — AI isn't priced by the character

The unit on AI price lists is neither 'characters' nor 'words' but 'tokens'. Because of this difference, the same content costs more in Korean than in English, and your actual bill can rise even when the price list stays the same. Here is the rundown, with real price lists as of August 2026.

Know Before You Use· 8 min