@AlphaSignalAI: This free interactive explainer just exposed how GPT actually works. Most people treat Transformers like magic. You typ…
Summary
A free interactive tool called Transformer Explainer runs a live GPT-2 model in the browser, visualizing the internal workings of Transformers with a Sankey diagram and live inference.
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Cached at: 05/18/26, 10:29 AM
This free interactive explainer just exposed how GPT actually works.
Most people treat Transformers like magic. You type something in, words come out.
What happens inside stays a black box for almost everyone.
Transformer Explainer cracks that box wide open. It runs a live GPT-2 model in your browser.
The tool gives you three things at once:
Live inference on any text A visual map of every step A working temperature slider
A Sankey diagram traces your words through the full pipeline.
You see embeddings, attention heads, and the final token ranking.
You can collapse and expand each operation to control the depth.
Move the slider and the probability distribution shifts instantly.
High values spread predictions wide, low values sharpen them.
The whole thing runs locally using ONNX runtime and HuggingFace.
The frontend uses Svelte and D3 for animations.
The project is open-source and free.
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