Who makes Neuronpedia J-space visualization?

Neuronpedia J-space visualization is made by Neuronpedia.

Does Neuronpedia J-space visualization work in the EU?

Available in the EU. It is a public web app on neuronpedia.org with no regional restrictions found, though no explicit EU statement was provided. Last verified 14 Nov 2026.

How much does Neuronpedia J-space visualization cost?

Free. No pricing information found; Neuronpedia is presented as an open-source platform and the tool appears freely usable in the browser.

Where was Neuronpedia J-space visualization shown?

In 1 creator video by Matthew Berman. Most recently by Matthew Berman on 8 Jul 2026, at 5:47 in "We just figured out how AI actually works (J-Space)".

Neuronpedia J-space visualization

by Neuronpedia

Try it Website

Interactive Neuronpedia visualization of J-space contents for a prompt, with editable concepts, built with Anthropic.

Available in EUResearch Platforms & InfraApp

Updated 14 Nov 2026EU status checked 14 Nov 2026Last shown 8 Jul 2026

Neuronpedia J-space visualization at a glance

What is Neuronpedia J-space visualization?: Neuronpedia J-space visualization is an app from Neuronpedia. Interactive Neuronpedia visualization of J-space contents for a prompt, with editable concepts, built with Anthropic.
Who makes Neuronpedia J-space visualization?: Neuronpedia J-space visualization is made by Neuronpedia.
Does Neuronpedia J-space visualization work in the EU?: Available in the EU. It is a public web app on neuronpedia.org with no regional restrictions found, though no explicit EU statement was provided. Last verified 14 Nov 2026.
How much does Neuronpedia J-space visualization cost?: Free. No pricing information found; Neuronpedia is presented as an open-source platform and the tool appears freely usable in the browser.
Where was Neuronpedia J-space visualization shown?: In 1 creator video by Matthew Berman. Most recently by Matthew Berman on 8 Jul 2026, at 5:47 in “We just figured out how AI actually works (J-Space)”.

Sources: the vendor's own pages (linked above) and creator videos at the linked timestamps. EU status is information, not legal advice; see how we check.

About

The J-space visualization is a tool on Neuronpedia, an open-source interpretability platform. According to a YouTube creator's walkthrough, it was built with Anthropic and shows the J-space contents associated with a given prompt, presented as an interactive visual.

Users can edit those contents and see how the model's output changes. In the creator's demo, replacing the concept "tennis" with "inference" altered the output. This makes it useful for exploring how internal representations relate to model behaviour.

It is accessed through the Neuronpedia website in a browser. Details such as supported models, exact release date, usage limits and documentation were not available in the provided material, and the description here relies mainly on a single third-party video.

Key features

Shows J-space contents for a given prompt
Lets users edit the displayed contents
Output changes reflect edits (e.g. swapping 'tennis' for 'inference')
Built in collaboration with Anthropic
Hosted on the Neuronpedia interpretability platform

1 moment

As seen on YouTube

Watch the moment: the exact second top creators show it. Videos load only when you press play, via youtube-nocookie.com.

Matthew Berman8 Jul 2026

Live demo

We just figured out how AI actually works (J-Space)

Interactive visual tool built with Anthropic that shows J-space contents for a prompt and lets users edit them. The creator swapped 'tennis' for 'inference' and the output changed.

5:47Open on YouTube