⚡ Where RawWeights Began

Atomic GPT Playground

Train a real Transformer entirely in your browser. A "glass box" educational tool based on Andrej Karpathy's makemore — demonstrating how LLMs learn from data. No Python, no GPU required.

1. Training Data

State: Idle

2. Save / Load Model

Save your trained "brain" to your browser so you don't have to retrain later.

3. Generate Text

Logs will appear here...
Based on the "minGPT" and "makemore" work by Andrej Karpathy.  ·  View Original Repo  ·  Karpathy.ai
This playground is a simplified educational tool demonstrating the core algorithm of a Decoder-Only Transformer.