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    Neuronpedia

    Language Model Interpretability Team, Google DeepMind
    โš ๏ธ Rolling Release
    Neuronpedia is finalizing data uploads and feature label generation, a process which we expect to be completed by February 14, 2026.
    The artifacts in Gemma Scope 2 HuggingFace are complete and available for use.
    Gemma Scope 2
    Demo
    Examining Safety-Relevant Features and Circuits in Gemma 3
    ๐Ÿ‘‹ New Here?
    If you're new to interpretability (the science of understanding what happens inside AI), we recommend you start with the original "Exploring Gemma Scope", which has more beginner-friendly interactive demos and content.
    This Gemma Scope 2 demo focuses on exploring safety-relevant features in Gemma 3 27B-IT, the largest model in the new Gemma 3 model series. Since the Gemma Scope 2 release also includes transcoders, cross-layer transcoders, and crosscoders, Neuronpedia is also adding support for circuit tracing with those new artifacts.
    ๐Ÿ”ข Sections
    Do More
    Tutorial Notebook
    A Colab notebook for loading and using Gemma Scope 2 artifacts.
    Hugging Face
    Download the Gemma Scope 2 SAEs and transcoders.
    DeepMind Blog
    Read the official blog post announcement for Gemma Scope 2.