Microgpt is a GPT you can visualize in the browser
very much inspired by karpathy's microgpt of the same name. it's (by default) a 4000 param GPT/LLM/NN that learns to generate names. this is sorta an educational tool in that you can visualize the activations as they pass through the network, and click on things to get an explanation of them.
In plain words
Microgpt is a browser-based educational tool that visualizes a small 4000-parameter neural network trained to generate names. Users can watch activations flow through the network in real time and click on components to understand how they work. Inspired by Karpathy's original MicroGPT, it makes the inner workings of language models transparent and interactive for learning purposes.
written from the facts on this page · September 2026
Does the same job
all alternatives →- FCFully client-side GPT2 prediction visualizer2023 · perplexity.vercel.app · ▲153
Hi HN! I've found this visualization tool immensely helpful over the years for getting an intuition for how an LLM "sees" some piece of text, and with a bit of elbow grease decided to move all compute to client side so I could make it publicly available. I've found it particularly useful for - Understanding exactly how repetition and patterns affect a small LM's ability to predict correctly - Understanding different tokenization patterns and how it affects model output - Getting a general sense of how "hard" different prediction tasks are for GPT-style models Known problems (that I probably…
- MIMicroGPT in 243 Lines – Demystifying the LLM Black BoxFeb 2026 · ▲10
The release of microgpt by Andrej Karpathy is a foundational moment for AI transparency. In exactly 243 lines of pure, dependency-free Python, Karpathy has implemented the complete GPT algorithm from scratch. As a PhD scholar investigating AI and Blockchain, I see this as the ultimate tool for moving beyond the "black box" narrative of Large Language Models (LLMs). The Architecture of Simplicity Unlike modern frameworks that hide complexity behind optimized CUDA kernels, microgpt exposes the raw mathematical machinery. The code implements: The Autograd Engine: A custom Value class that…
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