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AI reference

Clear AI definitions and model data you can check.

A glossary written for practitioners, research summaries, and language models compared on price, limits and capabilities, with a source and a date next to every number.

257glossary terms
180articles
62models priced
next-token-prediction.py

Glossary

257 terms · A–Z

Definitions first, then how it works, worked examples, formulas and code.

LLM API pricing

62 models · 5 vendors

Per-token prices from each vendor's own page, with cache, batch and long-context rates.

Models

7 model cards · 6 comparisons

Context windows, limits and capabilities, with the source behind each value.

Tools

Token counter · cost calculator

Count the tokens in your prompt, then see what a month of traffic costs on every model.

LLM changelog

20 changes · last Sep 15, 2026

Model launches, price changes and retirements, each linked to the vendor's notice.

News and research

180 articles

Pricing news, research summaries and applied machine learning explainers.

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All 257 terms, A–Z

Latest articles

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AI Education

Prompt Engineering: What It Is, Techniques and Examples (2026)

Prompt engineering is the practice of designing and testing the instructions you give an AI model so that it consistently produces the output you need. Models in 2026 are far better at guessing intent than the GPT-3 of 2020, but they are…