Transformer Explainer: LLM Transformer Model Visually Explained

Transformer Explainer, from Polo Chau's group at the Georgia Institute of Technology, runs a live GPT-2 model in your browser: you type your own text and watch, in real time, how the transformer's internal components and operations work together to predict the next tokens. It has been online since 2024, and the paper behind it appears in the proceedings of CHI 2026. The model is GPT-2, so what you see is the transformer as GPT-2 has it, not a current frontier model.

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