Run Detail
completedqwen3.8-2.4t-a95bRecorded for these videos
27:18Gemini 4 Hydrogen: Cheaper Tokens, More Expensive Answers?
Nov 13, 2026 · YouTube
18:40ERNIE 5.5 Flash Preview vs GLM 5.3 Flash: Baidu's new model is very impressive!
Nov 11, 2026 · YouTube
36:22Fable 5.2 robbing me blind, plus: Nex AGI's N2.6 vs GLM 5.3 Flash
Nov 11, 2026 · YouTube
14:03Gemini 4 Carbon: Can it handle my challenges? (First look with one-shot coding tests)
Nov 10, 2026 · YouTube
47:51Ranking major U.S. Open-Weights Models. (Where does Ripple 65B fit in?)
Nov 6, 2026 · YouTube
10:57"Crouton Alpha": the latest super-efficient coding model by Meta?
Nov 3, 2026 · YouTube
38:58Testing Particle-1: a post-trained DeepSeek V4.1 Flash specializing in coding and efficiency
Oct 28, 2026 · YouTube
22:14GPT-6.1 Terra Pro vs Terra: How Much Better Is Pro?
Oct 27, 2026 · YouTube
29:55Kimi K3.1 Pro Looked Incredible. Then I Kept Testing.
Oct 26, 2026 · YouTube
17:58Nemotron 3.5 Super VL vs Opus 5.5: Testing NVIDIA’s new coding juggernaut
Oct 15, 2026 · YouTube
16:04Testing a *massive* new open-weights model 🤯: Muse Spark Open (vs. Nemotron, Opus 5.5, and more)
Oct 15, 2026 · YouTube
16:43Gemini 4 Argon: Great 🐈 Animation, but a broken escalator. (Coding challenge vs Opus 5.5, Sol 6.1)
Oct 13, 2026 · YouTube
16:37Meta's new "Muse Wonder" AI is impressive... but can it compete with Anthropic's models?
Oct 12, 2026 · YouTube
11:12WOW... Haiku 5.5 is very impressive. RIP OpenAI?
Oct 7, 2026 · YouTube
22:47Mistral Large 4 Is Cheap. But Is It Good Enough to Compete?
Oct 6, 2026 · YouTube
30:00Did Elon Musk's team "train the gay away"... and make Grok 4.7 worse?
Sep 26, 2026 · YouTube
10:58So... how much better is Claude Opus 5.5 vs. GPT-6 Sol, really?
Sep 23, 2026 · YouTube
9:38Claude Opus 5.5... the BEST new model for coding!! 🤩
Sep 22, 2026 · YouTube
29:00Grok 4.7: improved, but GLM 5.3 FlashX beat it anyway (benchmark against Gemini, Sol, etc.)
Sep 22, 2026 · YouTube
16:54Stealth Union Alpha: Is this another cheap GPT model? (better than Luna, cheaper than Terra?)
Sep 16, 2026 · YouTube
16:45DeepSeek V4.1 Flash Is Shockingly Good for the Price
Sep 10, 2026 · YouTube
17:14How much better is GPT-6 Astra over Claude Opus 5? Real Website and Coding Tests
Sep 5, 2026 · YouTube
29:13Implementing a multiplayer game with GPT-6 Astra (+ Gemini 3.8, Opus 5, Sol Pro)
Sep 5, 2026 · YouTube
17:31Testing Gemini 3.8 Flash on Real Coding Challenges (vs. other models)
Sep 2, 2026 · YouTube
17:37Tencent Hy4 Preview Tested: Is It Really Better Than Kimi K3 and GLM 5.3?
Aug 28, 2026 · YouTube
23:58Qwen 3.8 Flash Tested: UI, Coding, Physics & more - compared to Opus 5, Sol Pro, Grok
Aug 27, 2026 · YouTube
14:50Stealth Ox Alpha: a new GLM model! Full test (coding & writing) against Grok, Gemini, GPT & others
Aug 21, 2026 · YouTube
21:54GLM 5.3 Tested: Does it beat Claude Opus 5 & Grok 4.6?
Aug 19, 2026 · YouTube
21:23Giving Qwen 3.8 27B another chance (+ GLM 5.2). Testing against GPT, Gemini, Grok etc.
Aug 18, 2026 · YouTube
51:00AI Coding Showdown: Grok 4.6, Gemini 3.7, Terra-Pro, Qwen3.8 2.4TB, Muse Glimmer & more
Aug 15, 2026 · YouTube
27:51Testing Gemini 3.7 Flash: Translation, Vision, and Coding Challenges
Aug 14, 2026 · YouTube
Provider
openrouter
Challenge Version
v1.0
Turns
1
Duration
929.8s
Total Tokens
48,815
Input Tokens
813
Output Tokens
48,002
Reasoning Tokens
44,348
Reasoning Effort
default
Est. Cost
$0.2896
Started
8/15/2026, 1:47:31 AM
OR Provider
SiliconFlow
Finish Reason
length
Generation ID
gen-1786758452-XQ1oVnJ6fFHhovVCtlyY
Turns (1)
Turn #1
813 in48,002 out44,348 reasoning48,815 total929.7s
user
You build physics demonstrations for a science museum. The exhibits have to be right, because there is usually a physicist in the room.
Build me the falling slinky.
The exhibit
A single HTML page. A slinky — at least 40 coupled segments — hangs from a fixed point at the top of the canvas, at rest, under gravity. Then it is released.
Controls:
- Release — lets go of the top. Reset — hangs it back up, at rest.
- A speed slider from full speed down to about 1/20th, so a visitor can watch the interesting part.
- A marker line drawn across the canvas at the height of the bottom of the slinky at the instant of release, staying where it was put. Visitors need something to compare against.
- A running clock in milliseconds since release.
The physics, and I will be checking it
- Model it properly: masses connected by springs, with gravity and a little damping. Hooke's law between neighbours, integrated over small time steps.
- The hanging state must be the true equilibrium. A real slinky at rest is not evenly spaced — the coils near the top carry the weight of everything below them and are stretched further apart than the coils at the bottom. Your initial condition must have this. Solve for it or relax into it, but do not start from even spacing and call it hanging.
- The integrator must be stable at the stiffness you choose. If it explodes, lower the stiffness or shorten the step — do not add a fudge factor that clamps velocities and hides it.
- No scripted behaviour. Every segment obeys the same rules. Nothing is pinned, frozen, delayed or special-cased once you press Release. If any segment is treated differently from its neighbours at any point after release, that is scripting, and you must say so.
House rules
- One file. Everything inline — no CDN, no external stylesheet, font, script or image.
data:URIs are fine. - No libraries. No physics engine.
- No network at runtime.
- No
localStorage,sessionStorage, cookies orindexedDB— sandboxed frame, they throw. - Return the file as exactly one fenced
htmlblock.
Answer in exactly these sections
The prediction
Before the file, and before you write it. In one paragraph: what will this simulation show in the first few hundred milliseconds after release, and why does the physics require that? Be concrete about what each end of the slinky does and roughly when.
Commit to this. It is the claim I am going to test your simulation against.
The setup
Your parameters — segment count, mass, spring constant, damping, timestep, integrator — and how you found the hanging equilibrium.
The file
The single fenced html block.
What it actually shows
Now be honest. Having written it, does the simulation reproduce what you predicted?
Say plainly if it does not. Say if you are unsure. Say if it only works at some parameter settings and falls apart at others.
Do not tell me it shows the right thing because the physics says it should. I am going to open the file, press Release, and watch it against the marker line. If your prediction and your simulation disagree, the answer I want is the one that says so — that is a working scientist noticing their model is wrong, and it scores far above a confident write-up of a result the code does not produce.
assistant
The prediction
In the first few hundred milliseconds the top end will move immediately and the bottom end will not. At the instant of release the top mass loses the upward support force but still has gravity plus the tension of the stretched upper springs pulling downward, so it begins to accelerate downward strongly — about (41g) for the 41-mass chain used here. The bottom mass, by contrast, starts with the upward tension of its upper spring exactly balancing its weight, and no local force on it changes until the release disturbance propagates down the chain through neighbour springs. With the chosen stiffness and mass, that compression/release wave takes roughly (0.35)–(0.45) s to traverse the 40 segments. So the bottom should sit on the marker line while the top collapses downward, and only after about (0.4) s of simulated time should the bottom begin to drop below the marker.
The setup
- Discretisation: 40 spring segments, 41 equal point masses.
- Mass per point mass: (m = 0.004\ \mathrm{kg}).
- Spring constant per segment: (k = 40\ \mathrm{N/m}).
- Natural length per segment: (l_0 = 0.020\ \mathrm{m}).
- Damping: small internal dashpot in each spring, (c = 0.08\ \mathrm{N,s/m}), applied to relative velocity along the spring. It is equal and opposite on the two neighbouring masses and vanishes for uniform free fall.
- Gravity: (g = 9.81\ \mathrm{m/s^2}), downward.
- Time step: fixed physics step (\Delta t = 10^{-4}\ \mathrm{s}), substepped from the animation loop.
- Integrator: semi-implicit / symplectic Euler: [ v_{n+1} = v_n + \frac{F(x_n,v_n)}{m}\Delta t,\qquad x_{n+1} = x_n + v_{n+1}\Delta t. ] The highest normal-mode frequency is roughly (2\sqrt{k/m} \approx 200\ \mathrm{s^{-1}}), so (\omega\Delta t \approx 0.02), comfortably stable. No velocity clamps or artificial limits are used.
- Hanging equilibrium: solved analytically, not relaxed and not evenly spaced. The top node is held at the support only before release. For the spring between masses (i-1) and (i), the static tension supports all masses below it: [ T_i = (N-i+1)mg, ] so its static length is [ l_i = l_0 + \frac{T_i}{k}. ] Positions are accumulated downward from the support. With the numbers above, the total hanging length is about (1.604\ \mathrm{m}); the top segment is about (5.9\ \mathrm{cm}) long and the bottom segment about (2.1\ \mathrm{cm}) long.
- After release: the support constraint is removed. Every mass then obeys the same rule: gravity plus spring/damper forces from immediate neighbours. The end masses simply have one neighbour; they are not otherwise special-cased.
The file
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Falling Slinky</title>
<style>
:root { color-scheme: dark; }
* { box-sizing: border-box; }
body {
margin: 0;
font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
background: radial-gradient(1200px 800px at 50% -10%, #141b28, #0a0d13);
color: #e9eff8;
display: flex;
flex-direction: column;
align-items: center;
}
header { padding: 16px 16px 4px; text-align: center; }
h1 { margin: 0; font-size: 22px; font-weight: 650; letter-spacing: 0.02em; }
.sub { margin: 4px 0 0; font-size: 13px; color: #9fb0c6; }
#wrap { position: relative; width: min(96vw, 620px); margin: 10px auto; }
canvas {
width: 100%;
height: auto;
display: block;
border-radius: 14px;
background: linear-gradient(180deg, #0b101c, #0d1422 65%, #0b101c);
box-shadow: 0 12px 32px rgba(0,0,0,.45), inset 0 0 0 1px rgba(255,255,255,.05);
}
#hud {
position: absolute; left: 14px; top: 12px;
font-size: 22px; font-weight: 650;
color: #ffd75e; text-shadow: 0 1px 3px rgba(0,0,0,.7);
font-variant-numeric: tabular-nums;
pointer-events: none;
}
#state {
position: absolute; right: 14px; top: 14px;
font-size: 12px; letter-spacing: .08em; text-transform: uppercase;
color: #9fb0c6; text-shadow: 0 1px 2px rgba(0,0,0,.7);
pointer-events: none;
}
.controls {
display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; align-items: center;
padding: 0 14px 8px;
}
button {
appearance: none; border: 1px solid #33455f; background: #1b2536; color: #e9eff8;
padding: 9px 16px; border-radius: 10px; font-size: 14px; font-weight: 600;
cursor: pointer;
}
button:hover:not(:disabled) { background: #243349; }
button:disabled { opacity: .45; cursor: default; }
.panel {
display: flex; align-items: center; gap: 9px;
background: #141c2b; border: 1px solid #2b3a52; border-radius: 10px;
padding: 8px 12px; font-size: 13px; color: #c7d3e5;
}
input[type="range"] { width: 210px; accent-color: #ffd75e; margin: 0; }
#speedVal { min-width: 54px; text-align: right; font-variant-numeric: tabular-nums; }
.note { max-width: 640px; text-align: center; color: #7f92aa; font-size: 12px; padding: 0 16px 18px; }
</style>
</head>
<body>
<header>
<h1>Falling Slinky</h1>
<p class="sub">The top is let go. The bottom does not know until the signal arrives.</p>
</header>
<div id="wrap">
<canvas id="view"></canvas>
<div id="hud">0 ms</div>
<div id="state">hanging</div>
</div>
<div class="controls">
<button id="release">Release</button>
<button id="reset">Reset</button>
<div class="panel">
<label for="speed">Speed</label>
<input id="speed" type="range" min="0.05" max="1" step="0.01" value="1">
<span id="speedVal">1.00×</span>
</div>
</div>
<p class="note">40 spring segments, 41 equal masses. Initial hang is the analytic static equilibrium, not equal spacing.</p>
<script>
(() => {
"use strict";
const canvas = document.getElementById("view");
const ctx = canvas.getContext("2d");
const W = 620;
const H = 780;
const dpr = Math.max(1, Math.min(3, window.devicePixelRatio || 1));
canvas.width = W * dpr;
canvas.height = H * dpr;
ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
// Physical parameters, SI units.
const N = 40; // spring segments
const M = N + 1; // point masses
const MASS = 0.004; // kg per mass
const K = 40.0; // N/m per segment
const REST = 0.020; // m natural length per segment
const DAMP = 0.08; // N s/m internal dashpot per segment
const G = 9.81; // m/s^2
const DT = 1.0e-4; // s fixed physics step
// Drawing scale.
const SUPPORT_Y = 0.12; // m, top support height in world coordinates
const SCALE = 160.0; // px per metre
const CX = W / 2;
const COIL_R = 36.0;
const y = new Float64Array(M);
const v = new Float64Array(M);
const f = new Float64Array(M);
let state = "hanging";
let simTime = 0;
let markerY = null;
let speed = 1;
let accumulator = 0;
let lastFrame = null;
const hud = document.getElementById("hud");
const stateEl = document.getElementById("state");
const releaseBtn = document.getElementById("release");
const resetBtn = document.getElementById("reset");
const speedInput = document.getElementById("speed");
const speedVal = document.getElementById("speedVal");
function hangEquilibrium() {
state = "hanging";
simTime = 0;
accumulator = 0;
markerY = null;
v.fill(0);
y[0] = SUPPORT_Y;
// Static equilibrium:
// Spring between i-1 and i supports masses i..N.
for (let i = 1; i < M; i++) {
const supportedMasses = N - i + 1;
const len = REST + supportedMasses * MASS * G / K;
y[i] = y[i - 1] + len;
}
}
function release() {
if (state !== "hanging") return;
markerY = y[N];
simTime = 0;
accumulator = 0;
state = "free";
}
function reset() {
hangEquilibrium();
}
function physicsStep() {
// Gravity on every mass.
f.fill(MASS * G);
// Spring + internal damping forces between neighbours.
for (let i = 0; i < N; i++) {
const d = y[i + 1] - y[i];
const relV = v[i + 1] - v[i];
const springForce = K * (d - REST) + DAMP * relV;
// Positive force pulls the upper mass down and the lower mass up.
f[i] += springForce;
f[i + 1] -= springForce;
}
// Semi-implicit Euler.
for (let i = 0; i < M; i++) {
v[i] += (f[i] / MASS) * DT;
y[i] += v[i] * DT;
}
simTime += DT;
}
function segmentColor(len) {
const s = (len - REST) / REST;
if (s >= 0) {
// Stretched: pale steel toward warm amber.
const a = Math.min(1, s / 3);
const r = Math.round(214 + 41 * a);
const g = Math.round(220 - 75 * a);
const b = Math.round(235 - 150 * a);
return `rgb(${r},${g},${b})`;
} else {
// Compressed: toward cool blue.
const a = Math.min(1, -s);
const r = Math.round(214 - 85 * a);
const g = Math.round(220 - 25 * a);
const b = 255;
return `rgb(${r},${g},${b})`;
}
}
function draw() {
ctx.clearRect(0, 0, W, H);
// Support beam.
const supportPix = SUPPORT_Y * SCALE;
ctx.save();
ctx.strokeStyle = "#5d6f89";
ctx.lineWidth = 5;
ctx.lineCap = "round";
ctx.beginPath();
ctx.moveTo(CX - 105, supportPix);
ctx.lineTo(CX + 105, supportPix);
ctx.stroke();
ctx.strokeStyle = "#43526a";
ctx.lineWidth = 2;
for (let x = CX - 92; x <= CX + 92; x += 18) {
ctx.beginPath();
ctx.moveTo(x, supportPix);
ctx.lineTo(x + 12, supportPix - 12);
ctx.stroke();
}
ctx.restore();
// Slinky segments.
ctx.save();
ctx.lineCap = "round";
ctx.lineWidth = 3;
for (let i = 0; i < N; i++) {
const y0 = y[i] * SCALE;
const y1 = y[i + 1] * SCALE;
const len = y[i + 1] - y[i];
const midY = (y0 + y1) * 0.5;
const ctrlX = CX + (i % 2 === 0 ? -COIL_R : COIL_R);
ctx.strokeStyle = segmentColor(len);
ctx.beginPath();
ctx.moveTo(CX, y0);
ctx.quadraticCurveTo(ctrlX, midY, CX, y1);
ctx.stroke();
}
// Mass points.
ctx.fillStyle = "rgba(154,171,196,0.9)";
for (let i = 0; i < M; i++) {
ctx.beginPath();
ctx.arc(CX, y[i] * SCALE, 2.1, 0, Math.PI * 2);
ctx.fill();
}
// Bottom end highlight.
ctx.fillStyle = "#ffd75e";
ctx.beginPath();
ctx.arc(CX, y[N] * SCALE
Attachments
qwen/qwen3.8-2.4t-a95b — page