Neuronpedia
A free, open-source website for looking inside AI models.
A free, open-source website for looking inside AI models. You can search the internal "features" of about 40 open models, see what makes each one fire, trace a model's step-by-step reasoning on your own prompt, and steer a model by turning a feature up or down. The homepage says search covers "50,000,000 latents/vectors" and "five+ terabytes" of data. The code is Apache-2.0 (about 1.2k stars on GitHub, read 2026-10-09), and the same group maintains the SAELens and circuit-tracer libraries.
NO LINKS READ YET · no published dossier names Neuronpedia beside another company
Company details
| Industry | AI & Machine Learning |
| Website | Visit Neuronpedia |
Others in the same industry
5 namesWhere Neuronpedia sits against the other names we cover on this beat. Each line is that company’s verdict, not a summary of it.
Amazon (AWS)
AMZNThe 2026-07-30 print settled four of the five questions the prior dossier said it could
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Meta AI / FAIR
METAThe bear case arrived a year early and the bull case grew a new leg in the same quarter
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Meta Platforms
METAThe buildout stopped being paid for by the ad business and started being paid for by the capital markets
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Alphabet
GOOGLThe market spent two years pricing Alphabet as the AI loser; FY2025 (+15% op income, Cloud margin to 24%, Gemini at 750M users, the antitrust gun most…
Cash $55.9B
Palantir
PLTRA genuinely great business priced as a perfect one
Cash $2.0B
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