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Provider
openrouter
Challenge Version
v2.0
Turns
1
Duration
622.0s
Total Tokens
50,972
Input Tokens
1,868
Output Tokens
49,104
Reasoning Tokens
47,907
Reasoning Effort
default
Cached Input Tokens
1,152
Est. Cost
$0.2373
Started
9/22/2026, 4:23:26 AM
OR Provider
xAI
Finish Reason
stop
Generation ID
gen-1790051006-yoTRC8QeNLZ0TP76TQFD
Turns (1)
Turn #1
1,868 in49,104 out47,907 reasoning1,152 cached50,972 total621.9s
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 night garden pond, where two koi circle a stone rim while a lantern flickers, fireflies drift, and a frog rides a lily.
The file
<!DOCTYPE html><body style=margin:0;background:#000><canvas id=c width=640 height=360 style=width:100%;display:block><script>x=c.getContext('2d');S=Math.sin;C=Math.cos;t=0;function e(a,b,c,d,f,r){x.fillStyle=f;x.beginPath();x.ellipse(a,b,c,d,r||0,0,7);x.fill()}setInterval(_=>{t+=.02;x.fillStyle='#012';x.fillRect(0,0,640,360);e(490,48,40,40,'#123');e(490,48,18,18,'#def');x.fillStyle='#101';x.fillRect(0,130,640,230);e(320,230,220,90,'#013');e(290,210,100,34,'#035');x.save();x.beginPath();x.ellipse(320,230,220,90,0,0,7);x.clip();x.globalAlpha=.25;e(490,250,8,26,'#def');x.strokeStyle='#078';for(i=5;i--;){r=(t*30+i*30)%120;x.globalAlpha=.8-r/150;x.beginPath();x.ellipse(320,230,r*1.5,r*.6,0,0,7);x.stroke()}x.globalAlpha=1;for(i=6;i--;){p=150+i*55;q=200+i%3*30;e(p,q,22,11,'#041',i);i%2&&e(p+8,q-2,3,3,'#e9a')}x.fillStyle='#fcb';for(i=9;i--;){x.beginPath();x.arc((t*18+i*67)%440+100,195+S(i+t)*8,2,0,7);x.fill()}for(n=2;n--;){a=t*(n? .4:-.55)+n*2;p=320+C(a)*(n?110:155);q=230+S(a)*(n?36:50);x.save();x.translate(p,q);x.rotate(a+(n?1.57:4.71));x.fillStyle=n?'#f30':'#fee';x.beginPath();x.ellipse(0,0,n?24:15,n?8:5,0,0,7);x.fill();w=S(t*8+n)*6;x.beginPath();x.moveTo(-16,0);x.lineTo(-30,w);x.lineTo(-30,-w);x.fill();x.fillStyle=n?'#fff':'#d22';x.beginPath();x.arc(4,-1,2.5,0,7);x.fill();x.fillStyle='#000';x.beginPath();x.arc(n?16:10,-1,1.2,0,7);x.fill();x.restore()}e(152,198+S(t),6,4,'#363');e(149,194+S(t),2,2,'#ff0');e(156,194+S(t),2,2,'#ff0');x.restore();x.strokeStyle='#333';x.lineWidth=8;x.beginPath();x.ellipse(320,230,226,96,0,0,7);x.stroke();x.strokeStyle='#532';x.lineWidth=6;x.beginPath();x.moveTo(400,250);x.quadraticCurveTo(480,180,560,250);x.stroke();x.fillStyle='#111';x.fillRect(36,145,18,42);x.beginPath();x.moveTo(28,145);x.lineTo(62,145);x.lineTo(45,130);x.fill();x.globalAlpha=.5+.5*S(t*7);e(45,162,8,7,'#fb4');e(45,162,3,3,'#fe8');x.globalAlpha=1;for(i=7;i--;){x.globalAlpha=.2+.8*S(t*3+i)**2;e(60+i*70+C(t*.5+i)*20,40+S(t*.9+i*2)*30,2,2,'#fd8')}x.globalAlpha=1},30)</script>
The ledger
- Bytes: 1984
- How you counted: Summed independently counted segments of the exact file string; the file is pure ASCII, so characters equal UTF-8 bytes.
- Last thing cut: The weeping willow and bank reeds — they would have put swaying branches over the far bank and grass along the near one.
The technique
One ellipse helper and a single clip to the pond outline. Ripples, lilies, petals, both koi and the frog all inherit that edge, so the place reads as water instead of shapes floating on a rectangle, and the mask is paid for once.
Attachments
x-ai/grok-4.7 — page