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Accounts, API Keys & Limits

You can use most of Neuronpedia without an account. Sign in to save your work and to use some tools.

Sign In​

Click Sign In at the top right. You can sign in with Google, GitHub, Apple, or an email link. Accounts are free.

With an account, you can:

  • Save and share lists of features.
  • Add bookmarks, explanations, comments, and votes.
  • Make auto-interp explanations with your own AI provider key.
  • Keep the graphs and vectors that you make in your account.
  • Upload features, vectors, and graphs with the API.

Account Settings​

Go to neuronpedia.org/account to change these settings:

  • Username - Public. Use only letters, numbers, and dashes.
  • Neuronpedia API Key - Private. Use this key to call the API and the Python library.
  • Auto-Interp Keys - Private. Your API keys for OpenAI, Anthropic, Google, or OpenRouter. Neuronpedia uses them to make auto-interp explanations for you.
  • Email Settings - Subscribe to the newsletter, or unsubscribe from all emails.

Use Your API Key​

Put your API key in the x-api-key header:

curl -X POST https://www.neuronpedia.org/api/steer \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_NEURONPEDIA_API_KEY" \
  -d '{ ... }'

For the Python library, set the NEURONPEDIA_API_KEY environment variable.

Many GET endpoints do not need a key. Endpoints that write data, or that are connected to your account, need a key.

Rate Limits​

Neuronpedia limits the number of requests in each 60-minute window. Some examples of the default limits:

EndpointRequests per hour
Steering (/api/steer*)240
Test activations (/api/activation/new)1000
Search explanations (/api/explanation/search)200
Search TopK by token (/api/search-topk-by-token)500
Search via inference (/api/search-all)1600
Generate a graph (/api/graph/generate)30
Jacobian Lens prompts (/api/lens/prompt)240
NLA explanations (/api/nla/explain)120
All other endpoints25000

If you go over a limit, the API returns HTTP status 429. The response tells you the endpoint and its limit. The x-limit-remaining header shows how many requests you have left.

Need higher limits for research? Email us with your use case. We can give your API key higher limits.