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TransformerLens
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TransformerLens

A library for mechanistic interpretability of GPT-style language models

by TransformerLensOrg · GitHub
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Analyze and understand how GPT-style language models work by examining their internal processes.

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3.8k3.7k
2026-07-122026-08-31
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📄 About

A library for mechanistic interpretability of GPT-style language models

TransformerLens has 3.8k stars on GitHub. It has been forked 677 times. TransformerLens is written mainly in Python. It has been in active development since 2022. TransformerLens is available under the MIT license.

Frequently asked questions

What is TransformerLens?

A library for mechanistic interpretability of GPT-style language models

Is TransformerLens open source?

TransformerLens is an open-source project. It is released under the MIT license.

Is TransformerLens free?

Yes. TransformerLens is free and open source — you can use, modify and self-host it.

What license does TransformerLens use?

TransformerLens is available under the MIT license.

What language is TransformerLens written in?

TransformerLens is written mainly in Python.

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