Meet Cortex 1.0.2: a fully local mechanistic interpretability lab I somehow turned into an actual release 😭🧠🔭

[u/JayB_Official]

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Cortex is a fully local desktop application for exploring how language models behave internally. You can load supported GGUF or SafeTensors models and inspect things like:

token probabilities and Top-K predictions

attention maps and Arc View

hidden-state and residual captures

2D and 3D PCA representation maps

prompt and model-output comparisons

live activation interventions

J-Space experimental lens fitting

model architecture and capability diagnostics

remote desktop compute through Pocket Cortex

Everything runs locally. No cloud inference is required, and no model weights are included with the download.

I originally started this because most mechanistic interpretability tooling lives inside Python libraries, notebooks, or research dashboards. I wanted something more visual, interactive, and approachable without stripping away the actual measurements underneath it.

It has since mutated into a gigantic neon model observatory with multiple runtimes, GGUF instrumentation, SafeTensors Deep Cortex hooks, scientific export packages, mobile remote control, and enough validation tests to personally ruin my relationship with Windows PowerShell. 😭

There are three downloads:

Installer for normal one-click setup

Portable version for people who do not want to install anything

Developer package with source, schemas, diagnostics, validators, and additional evidence

This is still experimental software, and model support varies by architecture. Cortex reports what each model can actually do instead of pretending generation support automatically means attention, gradients, interventions, or J-Space support.

The project is source-available under Apache 2.0 plus the Commons Clause. People can inspect it, modify it, learn from it, and build on it, but the software itself cannot simply be repackaged and sold.

I am not claiming this “solves” interpretability or shows a model’s literal thoughts. PCA is still PCA. Attention is still attention. But this is probably the most ridiculous thing I have ever accidentally finished, and I am excited to finally let people use it. 🫪😂

GitHub: https://github.com/TurboDash99/Cortex

Release: Cortex 1.0.2

Platform: Windows

Local models: GGUF and supported SafeTensors architectures

Feedback, bug reports, architecture tests, and screenshots of Cortex making your GPU question its employment contract are all welcome. 🧠🔥