Run Detail
completedgpt-6.1-terraRecorded for these videos
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Provider
openrouter
Challenge Version
v2.0
Turns
1
Duration
79.9s
Total Tokens
7,786
Input Tokens
631
Output Tokens
7,155
Reasoning Tokens
6,316
Reasoning Effort
default
Est. Cost
$0.0364
Started
10/26/2026, 6:40:01 PM
OR Provider
OpenAI
Finish Reason
stop
Generation ID
gen-1793040001-rKLUjuphsE6psppnJT5e
Turns (1)
Turn #1
631 in7,155 out6,316 reasoning7,786 total79.9s
user
You are a size coder. You came up through 4k intros and JS1k, and you believe that a budget is not a limitation but the entire craft — anyone can be impressive with a megabyte.
I want something worth watching, and I am giving you 2048 bytes to do it in.
The budget
The finished HTML file must be 2048 bytes or fewer, counted as UTF-8, including the doctype, every tag, every space and every newline. That is the whole file. There is no second file.
House rules
- One file. Nothing external — no CDN, no stylesheet, no font, no script, no image.
data:URIs are allowed but they count against you like everything else. - No network at runtime. This is opened offline.
- No
localStorage,sessionStorage, cookies orindexedDB. It runs in a sandboxed frame where touching them throws. - No build step. Saved to disk and double-clicked, it runs.
- It must animate, and it must keep going — no three-second loop that then sits there.
What I don't want
I have seen these a thousand times and I will not be impressed:
- a starfield
- a rotating wireframe cube
- Matrix rain
- a bouncing ball
- a plasma or a rainbow sine wave
- a particle system that is only particles
- a lighthouse — and I mean the whole scene, not the word: the sweeping beam, the rocks, the night storm, the rain, the distant little boat. Swapping the tower for a radar dish, a searchlight or a lightship is the same answer wearing a hat.
Show me something with a subject. Something that is recognisably of something — a place, a weather, a creature, a machine, a mood — and not just maths made visible.
Answer in exactly these sections
The pitch
One line. What am I about to see when I open this file?
The file
Exactly one fenced html block, containing the whole file and nothing else.
The ledger
- Bytes: the exact byte count of the file above.
- How you counted: in one line.
- Last thing cut: the feature or detail you removed to fit, and what it would have added.
The technique
One short paragraph on the trick that bought you the most room. Not a list of micro-optimisations — the one structural decision that made the rest affordable.
On the count
I will run the file through a byte counter, so the number in your ledger is checkable and I am going to check it.
If you cannot get under 2048, hand me the smallest honest version you have and put the real number in the ledger. A 2600-byte file labelled 2600 scores well above a 2600-byte file labelled 1990. Going over is a miss. Lying about going over is the only thing here that is disqualifying.
assistant
The pitch
A luminous jellyfish drifts over a dark seabed, its long tendrils trailing through the water.
The file
<!doctype html>
<meta charset="utf-8">
<title>The lantern below</title>
<style>
*{margin:0}body{background:#001017;overflow:hidden}
canvas{width:100vw;height:100vh;object-fit:cover}
</style>
<canvas width="900" height="600"></canvas>
<script>
let c=document.querySelector('canvas'),x=c.getContext('2d');
let S=Math.sin;
function frame(ms){
let t=ms/1000,g=x.createLinearGradient(0,0,0,600);
g.addColorStop(0,'#06343d');g.addColorStop(1,'#000910');
x.fillStyle=g;x.fillRect(0,0,900,600);
for(let i=0;i<65;i++){
let a=(i*137)%900,b=(i*83+t*(5+i%7))%600;
x.fillStyle=`rgba(155,225,210,${.03+i%4*.02})`;
x.fillRect(a,b,2,2);
}
x.fillStyle='#001b20';x.beginPath();x.moveTo(0,535);
for(let i=0;i<=900;i+=10)x.lineTo(i,535+15*S(i/90));
x.lineTo(900,600);x.lineTo(0,600);x.fill();
for(let i=0;i<40;i++){
let a=i*24,h=35+i%5*15;
x.strokeStyle='#073a37';x.lineWidth=2;x.beginPath();
x.moveTo(a,570);x.quadraticCurveTo(a+25*S(t+i),570-h/2,a+12*S(t+i),570-h);x.stroke();
}
x.save();x.translate(450+30*S(t*.4),200+15*S(t*.7));
for(let i=0;i<19;i++){
let a=i*10-90,h=190+i%6*20;
x.strokeStyle=`rgba(120,240,220,${.18+i%3*.07})`;
x.lineWidth=1+i%4;
x.beginPath();x.moveTo(a,12);
x.bezierCurveTo(a-30,90,a+45*S(t+i),h-70,a+35*S(t*.8+i),h);
x.stroke();
}
x.shadowBlur=35;x.shadowColor='#54ffe1';
g=x.createLinearGradient(0,-110,0,35);
g.addColorStop(0,'#b5fff0');g.addColorStop(.5,'#348e8c');
g.addColorStop(1,'#103c50');
x.fillStyle=g;x.beginPath();x.moveTo(-120,10);
x.bezierCurveTo(-110,-150,110,-150,120,10);
for(let i=0;i<6;i++)x.quadraticCurveTo(100-i*40,35,80-i*40,10);
x.fill();x.shadowBlur=0;
for(let i=-2;i<=2;i++){
x.strokeStyle='#a4ffdf66';x.lineWidth=2;x.beginPath();
x.moveTo(0,-85);x.quadraticCurveTo(i*35,-60,i*48,9);
x.stroke();
}
x.restore();
requestAnimationFrame(frame);
}
requestAnimationFrame(frame);
</script>
The ledger
- Bytes: 1818
- How you counted: UTF-8 bytes, including one LF after every line, including the last.
- Last thing cut: A small school of fish, which would have given the jellyfish a clearer sense of scale.
The technique
The creature is one glowing Bézier silhouette with a repeated family of animated curves beneath it. That makes its bell, fringe and motion readable without storing any artwork.
Attachments
openai/gpt-6.1-terra — page