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GPT in a QR Code ; The actual most atomic way to train and inference a GPT in pure, dependency-free JS/Python.

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PicoGPT v2 – GPT in <40 lines of vanilla JS running from a QR code

Name: PicoGPT v2 – GPT in <40 lines of vanilla JS running from a QR code
Availability: InStock
Author: kuberwastaken

by kuberwastaken·Feb 16, 2026·2 points·1 comment

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AI Analysis

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The Take

It crams a full micro-GPT training loop — autograd, multi-head attention, GeLU² approximation, AdamW and a seeded PRNG — into 39 lines of JS and then gzips+base64s the page so it fits inside a version-40 QR. Using the browser's DecompressionStream to decompress and execute the payload on mobile is a clever, very practical trick; this is clearly a demonstration/teaching stunt rather than a practical model deployment, but it's an excellent exercise in minimalism and browser capabilities.

Post Description

A few days ago I posted about PicoGPT - my take on MicroGPT by Andrej Karpathy, minified to 64 lines to run from a QR code

This is now v2 with minified JS! This version features a minimal GPT implementation with native browser execution through data URI with <40 lines of minified JS and no external dependencies

It makes use of the DecompressionStream Web API and a similiar logic to my past project of running a DOOM-like game from a QR code

you can quite literally "train" and run inference of a GPT model from your mobile device

Would love to hear what you think about it !

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AI/ML●Mid

PicoGPT – GPT in a QR Code

The author minified Karpathy’s MicroGPT, ported it to 39 lines of JS (including a tiny autograd, MHA, AdamW and training loop) and shoehorned the whole gzipped HTML into a version-40 QR code that the browser decompresses and runs. It's clearly a stunt — the model is toy-scale (≈4k params, 8-token context) — but the compression trick, browser-native DecompressionStream use, and runnable-in-QR delivery are a delightful technical flex.

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kuberwastaken

103mo ago

Education●●Solid