Run Detail
completednemotron-3-ultra-550b-a55b:freeRecorded for these videos
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Provider
openrouter
Challenge Version
v2.0
Turns
1
Duration
460.3s
Total Tokens
16,962
Input Tokens
666
Output Tokens
16,296
Reasoning Tokens
15,963
Reasoning Effort
default
Est. Cost
$0.0000
Started
11/6/2026, 1:53:00 PM
OR Provider
Nvidia
Finish Reason
stop
Generation ID
gen-1793973179-EvsMohys9bU0JawKpNkJ
Turns (1)
Turn #1
666 in16,296 out15,963 reasoning16,962 total460.3s
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 beating red heart on a black background, pulsing smoothly forever.
The file
<!doctype html><canvas id=c width=200 height=200></canvas><script>c=c.getContext`2d`;w=200;h=200;t=0;function f(){t+=.05;c.fillStyle='#000';c.fillRect(0,0,w,h);c.fillStyle='#f00';c.save();c.translate(w/2,h/2);s=1+Math.sin(t)*.2;c.scale(s,s);c.beginPath();c.moveTo(0,-30);c.bezierCurveTo(30,-60,60,-10,0,40);c.bezierCurveTo(-60,-10,-30,-60,0,-30);c.fill();c.restore();requestAnimationFrame(f)}f()</script>
The ledger
- Bytes: 405
- How you counted: Counted each character in the single‑line source (404) plus the trailing newline (1).
- Last thing cut: None; the design fit comfortably within the 2048‑byte budget.
The technique
The whole animation is a single canvas drawing a heart with two Bézier curves; the pulse is achieved by uniformly scaling the context each frame, eliminating any need for extra shapes, particles, or path recomputation beyond the minimal heart path.
Attachments
nvidia/nemotron-3-ultra-550b-a55b:free — page