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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.

256glossary terms
182articles
62models priced
next-token-prediction.py

Glossary

256 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

182 articles

Pricing news, research summaries and applied machine learning explainers.

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Fresh in the reference

Recently updated in the glossary

All 256 terms, A–Z

Latest articles

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Latest
Research

People Are Blurring Their Fingers in Selfies. Can AI Really Steal Your Fingerprints From a Photo?

Blur your fingertips before you post that peace-sign selfie: that advice has been circulating since a Chinese television show in April 2026 demonstrated how a celebrity’s V-sign photo could be enhanced to reveal fingerprint ridges. Within…