Run Detail
completedgpt-6.1-sol-proRecorded for these videos
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Provider
openrouter
Challenge Version
v2.0
Turns
1
Duration
267.6s
Total Tokens
36,285
Input Tokens
19,474
Output Tokens
16,811
Reasoning Tokens
14,832
Reasoning Effort
default
Est. Cost
$0.2071
Started
10/1/2026, 3:31:29 PM
OR Provider
OpenAI
Finish Reason
stop
Generation ID
gen-1790868689-JGOC9oSg0ItkNhzecj7x
Turns (1)
Turn #1
19,474 in16,811 out14,832 reasoning36,285 total267.6s
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
Six glass-belled jellyfish breathe and trail luminous silk through a dark, slant-lit sea.
The file
<!doctype html>
<body style="margin:0;background:#020d18;overflow:hidden">
<canvas id=c></canvas>
<script>
let a=c.getContext('2d'),S=Math.sin;
function f(t){
t/=1000;c.width=innerWidth;c.height=innerHeight;
a.scale(c.width/1000,c.height/700);
let g=a.createLinearGradient(0,0,0,700);
g.addColorStop(0,'#123d50');g.addColorStop(1,'#020713');a.fillStyle=g;a.fillRect(0,0,1000,700);
a.fillStyle='#8bdaca';
for(let i=0;i<7;i++){a.globalAlpha=.025;a.beginPath();a.moveTo(i*180-200,0);a.lineTo(i*180+20,0);a.lineTo(i*180+450+S(t*.2+i)*60,700);a.closePath();a.fill()}
a.globalAlpha=1;
for(let n=0;n<6;n++){
let z=.45+n*.14,x=100+n*170+S(t*.17+n)*70,y=270+S(t*.24+n*2)*140;
a.save();a.translate(x,y);a.scale(z,z);
a.strokeStyle='hsla('+(175+n*19)+',80%,80%,.5)';a.lineWidth=1;a.shadowColor=a.strokeStyle;a.shadowBlur=12;
for(let j=0;j<18;j++){a.beginPath();for(let k=0;k<25;k++){let v=k*9,w=(j-8.5)*6+S(k*.3-t*1.5+j*.5)*k*.9;k?a.lineTo(w,v+12):a.moveTo(w,12)}a.stroke()}
a.lineWidth=5;for(let j=-1;j<2;j++){a.beginPath();for(let k=0;k<18;k++){let y=k*8,x=j*18+S(y*.035-t*2+j)*12;k?a.lineTo(x,y+10):a.moveTo(x,10)}a.stroke()}a.lineWidth=1;
a.scale(1+S(t*2+n)*.1,1-S(t*2+n)*.12);
a.beginPath();a.moveTo(-70,10);a.bezierCurveTo(-65,-110,65,-110,70,10);a.quadraticCurveTo(0,38,-70,10);
g=a.createRadialGradient(-20,-65,1,0,-25,100);g.addColorStop(0,'#dff6');g.addColorStop(1,'#8ad0');a.fillStyle=g;a.fill();a.stroke();
for(let j=0;j<4;j++){a.beginPath();a.ellipse(S(j*1.57)*18,-25+Math.cos(j*1.57)*10,12,7,j*1.57,0,7);a.stroke()}
for(let j=-2;j<3;j++){a.beginPath();a.moveTo(0,-80);a.quadraticCurveTo(j*26,-45,j*25,18);a.stroke()}
a.beginPath();for(let j=0;j<=20;j++){let x=j*7-70,y=10+S(j*Math.PI/20)*14+S(j*2+t*2)*3;j?a.lineTo(x,y):a.moveTo(x,y)}a.stroke();
a.restore()}
requestAnimationFrame(f)}
requestAnimationFrame(f)
</script>
The ledger
- Bytes: 1823.
- How you counted: Counted 1794 ASCII characters plus 29 LF line endings, including the final LF; each is one UTF-8 byte.
- Last thing cut: Foreground kelp silhouettes, which would have given the open water a visible seabed.
The technique
One jellyfish drawing does all the work: scale, hue and phase turn it into six creatures at different depths. Its bell contracts independently of its trailing filaments, so a tiny shared drawing routine produces both anatomy and movement. Translucent gradients and Canvas shadows supply the apparent glass and bioluminescence without textures or stored geometry.
Attachments
openai/gpt-6.1-sol-pro — page