Can you tell Claude from GPT? Prove it and win AI credits.
Every round shows you an answer with the signature covered, and you name the model that wrote it. The fewer lines you need, the more the round pays — ×5 if you call it on the first line, ×1 if you wait for the last. Ten rounds a day are free, and the prizes are inference credits you can spend on any model.
It works like an eye chart. The top line is the hard one.
An optician covers one eye and asks how far down you can read. We cover the signature and ask how early you can tell. Same idea, better prizes.
You get a prompt and one line of the answer
The prompt is always visible. The answer arrives one line at a time, and the other three lines stay out of focus until you ask for them. The model's name sits under a black bar at the bottom of the card.
Call it now, or pay for another line
Each extra line makes the author easier to spot and the round cheaper to win. The multiplier drops from ×5 to ×3, then ×2, then ×1. A base round is worth $0.05 in credits, so a first-line call pays $0.25.
The bar slides off and the card settles
Right answers pay straight into your credit balance, and every correct call in a row adds another $0.05 on top, up to $0.20. Wrong answers pay nothing and break the streak, which is the whole reason not to guess on line one every time.
After ten rounds you get your acuity
The day ends with a score written the way an optician would write it, from 20/200 up to 20/10. It comes as a card you can post, because telling people you can spot Grok in one line is most of the fun.
Line one is a single sentence, often a greeting. Line four is the sign-off, where most models give themselves away. The chart pays you for not needing it.
Every model has a tell. Here is the examiner's cheat sheet.
Eight models are in the line-up. Open a card to see the kind of sentence that usually gives each one away.
The prize pool refills itself from trading fees.
80% of every $BLIND fee buys $ORBIO and stakes it. Staked $ORBIO earns CREDIT every hour, and that CREDIT is what the rounds pay out. The stake is never sold, so the pool grows for as long as the token trades.
The yield slider is an assumption you set, not a forecast. The chart keeps the $ORBIO price flat and compares credits earned per day (green) with prizes paid per day (red) at an average of $0.62 per player.
The board ranks eyesight, not luck.SAMPLE BOARD
Ranking is by acuity first and credits second, so one lucky ×5 does not beat a week of clean reads. Finish your ten rounds and your row shows up here.
| # | PLAYER | ACUITY | AVG LINE | CORRECT | CREDITS |
|---|
$BLIND buys you more rounds and a second look.
Playing is free and needs no wallet. Holding the token gives you more rounds a day and tools that make a hard card easier, and every trade of it refills the pool.
Walk-in
- Ten rounds a day, every day, with full multipliers and streak bonuses.
- Your acuity card and a place on the daily board.
- Unlimited practice rounds that pay nothing and cost nothing.
Regular
- Twenty rounds a day instead of ten, so a bad first card does not ruin the score.
- One Second Look per day, which removes two wrong models from a card.
- The weekly board, where the prize is paid from that week's pool yield.
Examiner
- Forty rounds a day and three Second Looks.
- Submit your own prompts. If a prompt of yours fools more than half the players, you earn a cut of that round's credits.
- A seat in the monthly final, played live on one shared set of cards.
The larger share buys $ORBIO and stakes it for good, and the CREDIT it earns is the only source of prizes. The smaller share buys $BLIND on the open market and burns it. Both wallets are public, and the pool wallet plays by the same rules as everybody else: it cannot sell its stake.
Connect a wallet on Robinhood Chain to check which tier you are in. Connecting only shares your address. The game itself never needs a signature, and credits are claimed with Sign in with X once live rounds open.
Connect a wallet on Robinhood Chain to see your $BLIND.
What is live today and what comes next.
The preview set
Thirty cards play on this page with full scoring, streaks, acuity and practice mode. The answers in the preview set are style samples written for the demo, and credits shown are preview credits.
Token and fee router
$BLIND goes live on Pons on Robinhood Chain. The router starts splitting fees 80/20 from the first trade, and the pool wallet makes its first stake in public.
Live rounds
Answers are generated at play time by the real models through one Orbio key. After each round the prompt, the model and a hash of the raw output are published. Sign in with X, and wins land in your playground balance.
Holder rounds and sponsors
Regular and Examiner tiers switch on with the weekly board. Model labs can sponsor a day by filling the pool with their own credits, which puts their model on more cards.
Everyone says they can tell. Ten cards a day will settle it.
You have read thousands of these answers already. Find out whether any of it stuck.