How language models actually work, the vocabulary you need, and what the jargon really means.
Paste any text to estimate how many tokens it uses, and see what that text would cost to send to each major model.
A plain-English tour of tokens, training, context and hallucination — what a language model is really doing when it answers you.
Clear definitions of the terms you actually encounter — LLM, token, context window, RAG, fine-tuning, agent, multimodal — and what each one means for choosing a tool.