An AI taken apart into the simplest switches, running on your computer

We rebuilt an open-source AI model entirely out of logic gates: nothing but on and off. Open the page and it works out answers bit by bit on your own graphics card, and every step can be checked.

Try it on my computer Is my computer good enough?

Free · no wallet · nothing goes on chain · needs desktop Chrome or Edge

Phones can’t run this model. To try it yourself, open 21nand.bem.city in Chrome or Edge on a computer.

A general-knowledge question
The capital of France is Paris.
A real answer, identical bit for bit to the original model · about 0.5–1.5 s per word

Straight answers first

It runs only on your computerTrying the gate brain puts nothing on chain and creates no on-chain asset for you.
Tokens carry no rightsHolders get no dividends or share of the circuits, tool income or future chips.
The chip is designed, not yet madeThe Bard passed the factory’s rule checks; which fab and when are not decided. See progress
Full layout of the Bard chip; the three rows of strips at the bottom hold what it has learned
OUR FIRST CHIP · BARD

The Bard

An AI that tells short stories, made directly into a chip. There is no processor and no program inside: what it learned is carved into the silicon, and it starts talking as soon as it powers on. Its complete blueprint is already on chain, where anyone can fetch and check it and no one can change it.

15 mm²smaller than a little fingernail
~1 millionparameters carved into the chip
$0spent on design software; all open source

On 2026-10-12 the design passed every manufacturing-rule check and its blueprint was stored on X Layer. It has not been sent to a fab yet.

Read its story Fetch the blueprint from chain and check it

What would you like to do?

TRY · 5 MINUTES

Watch it answer a question

Open the page, let it build the circuit on your computer, then ask anything. Afterwards you can submit your computer’s speed in one click to help us cover more devices.

Try it →
BUILD · FROM 1 HOUR

Make a small circuit of your own

Put a circuit of tens to thousands of gates on chain with TapeOut. Our 3,800-gate tapeout cost about 0.0023 OKB net.

See the steps and costs →
VERIFY · FOR EXPERTS

Check what we say yourself

Contract addresses, transactions and file fingerprints for everything we have on chain, plus the 21-gate driving arena.

Open the verify page →

How big is it?

260 billiongates to produce one wordAs if every person on Earth flipped a switch more than 30 times for each word.
~25,000gates fit in one on-chain circuitTen million times too small, so the whole model can’t go on chain; only small circuits do.
0 differencescompared bit by bit with the originalEvery bit the gates compute matches the original model.
For experts: the raw numbers

Model BitCPM4-1B · 261,022,627,596 NAND + 109,052,458 LATCH per token · gate-by-gate on WebGPU · token-for-token identical to the RefB reference · BSC block gas limit about 70 million