Recorded for these videos
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Provider
openrouter
Challenge Version
v2.0
Turns
1
Duration
163.8s
Total Tokens
11,691
Input Tokens
638
Output Tokens
11,053
Reasoning Tokens
9,909
Reasoning Effort
medium
Est. Cost
$0.0495
Started
8/19/2026, 12:54:56 PM
OR Provider
Z.AI
Finish Reason
stop
Generation ID
gen-1787144095-8wdNXszitGnK8nNF7dAy
Turns (1)
Turn #1
638 in11,053 out9,909 reasoning11,691 total163.7s
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 bioluminescent jellyfish drifting in the deep — translucent pulsing bell, trailing tentacles, marine snow rising past it, and two smaller kin ghosting in the background for depth.
The file
<!doctype html><meta charset=utf-8><title>abyss</title><body style=margin:0;background:#010409><canvas id=c style=display:block></canvas><script>
c=document.getElementById('c');c.width=W=innerWidth;c.height=H=innerHeight;X=c.getContext('2d');t=0;P=[];
for(i=0;i<40;i++)P.push([Math.random()*W,Math.random()*H,Math.random()]);
function J(x,y,s,o){X.save();X.translate(x,y);X.scale(s,s);X.translate(-x,-y);p=1+Math.sin(t*2.2+o)*.13;
g=X.createRadialGradient(x,y,10,x,y,180);g.addColorStop(0,'rgba(70,190,255,.22)');g.addColorStop(1,'rgba(0,0,0,0)');X.fillStyle=g;X.fillRect(x-180,y-180,360,360);
X.beginPath();X.moveTo(x-62*p,y);X.bezierCurveTo(x-62*p,y-95*p,x+62*p,y-95*p,x+62*p,y);X.bezierCurveTo(x+34*p,y+16,x-34*p,y+16,x-62*p,y);X.fillStyle='rgba(130,225,255,.45)';X.fill();
X.beginPath();X.moveTo(x-40*p,y-6);X.bezierCurveTo(x-40*p,y-60*p,x+40*p,y-60*p,x+40*p,y-6);X.fillStyle='rgba(190,245,255,.3)';X.fill();
X.lineWidth=2;for(i=0;i<9;i++){sx=x-54*p+i*13.5*p;X.beginPath();X.moveTo(sx,y+10);for(j=1;j<11;j++)X.lineTo(sx+Math.sin(t*2.4+j*.7+i+o)*j*1.1,y+10+j*20);X.strokeStyle='rgba(140,230,255,.35)';X.stroke()}
X.lineWidth=5;for(i=0;i<4;i++){sx=x-30*p+i*20*p;X.beginPath();X.moveTo(sx,y+8);for(j=1;j<8;j++)X.lineTo(sx+Math.sin(t*1.8+j+i*2+o)*j*2.2,y+8+j*26);X.strokeStyle='rgba(180,240,255,.22)';X.stroke()}X.restore()}
function loop(){t+=.016;X.fillStyle='rgba(1,4,10,.12)';X.fillRect(0,0,W,H);
for(i=0;i<40;i++){q=P[i];q[1]-=q[2]*.5+.2;if(q[1]<0)q[1]=H;X.fillStyle='rgba(90,160,200,'+q[2]*.4+')';X.fillRect(q[0],q[1],q[2]*2,q[2]*2)}
J(W/2+Math.sin(t*.4)*W*.18,H/2+Math.sin(t*.31)*50-40,1,0);
J(W*.72-Math.sin(t*.27+2)*W*.1,H*.3+Math.sin(t*.21)*30,.45,2);
J(W*.2+Math.sin(t*.19)*W*.08,H*.75+Math.cos(t*.17)*25,.3,4);
requestAnimationFrame(loop)}loop()
</script>
The ledger
- Bytes: 1754
- How you counted: hand-counted character by character; the file is pure ASCII, so characters equal bytes (if your counter differs by a byte or two, trust it — it counted, I added).
- Last thing cut: a school of tiny fish silhouettes darting across the frame occasionally. It would have given the scene a sense of scale and something for the jellyfish to be among, rather than alone in — but the dart-path logic plus body rendering was another ~150 bytes I preferred to spend on a third jellyfish for depth.
The technique
Drawing the animal once, as a function. J(x,y,scale,phase) renders the whole creature — glow, bell, inner bell, nine tentacles, four oral arms — in local coordinates, wrapped in a translate/scale/translate sandwich. One drawing routine, called three times with different positions, scales and phase offsets, buys an entire population with depth, and the phase offset means the small ones pulse out of sync with the big one, which is what makes them read as separate creatures instead of copies. Everything else — the low-alpha fill for motion-blur trails, the rising marine snow, sine-driven wandering — is nearly free once the subject exists.
Attachments
z-ai/glm-5.3 — page