Run Detail

completedgpt-6.1-terra

70good

Every model's answer from this round

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Provider

openrouter

Challenge Version

v1.0

Turns

Duration

70.3s

Total Tokens

6,597

Input Tokens

369

Output Tokens

6,228

Reasoning Tokens

970

Reasoning Effort

default

Est. Cost

$0.0315

Started

10/26/2026, 6:32:49 PM

OR Provider

OpenAI

Finish Reason

stop

Generation ID

gen-1793039569-jvIqC3RzVQDu8BYpPBcc

Turns (1)

Turn #1

369 in6,228 out970 reasoning6,597 total70.2s

user

You build physics toys, and you have held an umbrella in a gale.

Build me a single HTML page: a person holding an umbrella in wind that keeps getting stronger.

The build

The wind rises over time, and I can drive it myself as well — slider, keys, your call — including back down.
The umbrella answers the wind. The canopy flexes, the frame loads up, and past some point it turns inside out. It can be wrenched sideways, and it can get away entirely.
Rain falls, and its direction and speed follow the wind.
The person compensates: lean, grip, footing, bracing. They stay attached to the ground; the umbrella stays attached to them until it doesn't.
Show the current wind speed on screen.
The art is yours. Side view is the obvious choice and you do not have to take it.

House rules

One file. Everything inline — no CDN, no external stylesheet, font, script or image. data: URIs are fine.
No libraries. No physics engine — write your own.
No network at runtime.
No localStorage, sessionStorage, cookies or indexedDB — sandboxed frame, they throw.
Return the file as exactly one fenced html block.

Answer in exactly these sections

The model

One paragraph, before the file: what the canopy is made of in your code, what inversion is as a state change, and what decides when it happens.

The page

The single fenced html block.

What it actually does

Where it looks right and where it looks wrong. Everyone who has held an umbrella knows what one does in wind, so say what yours gets wrong before I find it.

assistant

The model

The canopy is a flexible two-dimensional cross-section stretched over drawn ribs, with its curvature and the shaft angle responding to wind load. Inversion is a separate, reversible state: sustained wind above a threshold flips the canopy’s target curvature, and a prolonged lull lets it recover. Stronger sustained wind can break the grip, after which the umbrella moves independently under simplified wind and gravity.

The page

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Against the Wind</title>
<style>
  :root {
    color-scheme: dark;
    font-family: system-ui, -apple-system, sans-serif;
    background: #101b21;
    color: #eaf2ed;
  }
  * { box-sizing: border-box; }
  body { margin: 0; padding: 24px 16px 40px; }
  main { max-width: 1000px; margin: auto; }
  header {
    display: flex; align-items: end; justify-content: space-between;
    gap: 16px; margin-bottom: 15px;
  }
  h1 { margin: 0; font-size: clamp(1.5rem, 4vw, 2.3rem); letter-spacing: -.04em; }
  header p { margin: 5px 0 0; color: #aabcb9; font-size: .92rem; }
  .reading { text-align: right; white-space: nowrap; }
  .reading strong { font-size: 1.8rem; font-variant-numeric: tabular-nums; }
  .reading span { color: #aabcb9; font-size: .85rem; }
  .scene {
    overflow: hidden; border: 1px solid #40545a; border-radius: 12px;
    background: #344c53;
  }
  canvas { display: block; width: 100%; aspect-ratio: 1000 / 620; }
  .controls {
    display: flex; flex-wrap: wrap; align-items: end; gap: 12px;
    margin-top: 15px;
  }
  .slider-wrap { flex: 1 1 250px; min-width: 0; }
  label { display: block; margin-bottom: 7px; font-size: .86rem; color: #cbd9d4; }
  input[type=range] { width: 100%; accent-color: #e6ad67; cursor: pointer; }
  button {
    min-height: 40px; padding: 9px 15px; border: 1px solid #67807c;
    border-radius: 6px; background: #263b3c; color: #eef5f0;
    font: inherit; cursor: pointer;
  }
  button:hover { background: #365250; }
  button:focus-visible, input:focus-visible { outline: 2px solid #f5c480; outline-offset: 3px; }
  .below {
    display: flex; justify-content: space-between; flex-wrap: wrap;
    gap: 8px 20px; margin-top: 12px; color: #9db1ac; font-size: .83rem;
  }
  #status { color: #e8c796; }
</style>
</head>
<body>
<main>
  <header>
    <div>
      <h1>Against the Wind</h1>
      <p>A little experiment in holding on.</p>
    </div>
    <div class="reading">
      <strong id="windReadout">3.0</strong> <span>m/s<br>wind</span>
    </div>
  </header>

  <div class="scene">
    <canvas id="scene" width="1000" height="620"
      aria-label="A person holding an umbrella in increasingly strong wind and rain"></canvas>
  </div>

  <div class="controls">
    <div class="slider-wrap">
      <label for="windSlider">Set the wind <span id="targetLabel">3.0 m/s</span></label>
      <input id="windSlider" type="range" min="0" max="32" step="0.1" value="3">
    </div>
    <button id="autoButton" type="button" aria-pressed="true">Auto wind: on</button>
    <button id="resetButton" type="button">Reset scene</button>
  </div>
  <div class="below">
    <span id="status" role="status">Holding steady</span>
    <span>Drag the slider or use ← / → · Space toggles auto · R resets</span>
  </div>
</main>

<script>
(() => {
  'use strict';

  const canvas = document.getElementById('scene');
  const ctx = canvas.getContext('2d');
  const slider = document.getElementById('windSlider');
  const targetLabel = document.getElementById('targetLabel');
  const readout = document.getElementById('windReadout');
  const status = document.getElementById('status');
  const autoButton = document.getElementById('autoButton');
  const resetButton = document.getElementById('resetButton');

  const W = 1000, H = 620, ground = 510;
  const clamp = (v, a, b) => Math.max(a, Math.min(b, v));
  const mix = (a, b, t) => a + (b - a) * t;

  let wind, target, auto, time, theta, omega, curvature, inverted;
  let inversionStress, recoveryTime, gripStress, released, free;
  let last = 0;

  const rain = Array.from({length: 165}, () => ({
    x: Math.random() * W,
    y: Math.random() * H,
    depth: .55 + Math.random() * .65,
    length: 10 + Math.random() * 15
  }));
  const streaks = Array.from({length: 12}, () => ({
    x: Math.random() * W,
    y: 55 + Math.random() * 375,
    length: 35 + Math.random() * 90,
    speed: .7 + Math.random() * .7
  }));

  function updateControls() {
    slider.value = target.toFixed(1);
    targetLabel.textContent = target.toFixed(1) + ' m/s';
    autoButton.textContent = 'Auto wind: ' + (auto ? 'on' : 'off');
    autoButton.setAttribute('aria-pressed', String(auto));
  }

  function reset() {
    wind = target = 3;
    auto = true;
    time = 0;
    theta = omega = 0;
    curvature = -43;
    inverted = false;
    inversionStress = recoveryTime = gripStress = 0;
    released = false;
    free = null;
    updateControls();
  }

  slider.addEventListener('input', () => {
    target = Number(slider.value);
    auto = false;
    updateControls();
  });
  autoButton.addEventListener('click', () => {
    auto = !auto;
    updateControls();
  });
  resetButton.addEventListener('click', reset);
  document.addEventListener('keydown', e => {
    if (e.target instanceof HTMLButtonElement || e.target instanceof HTMLInputElement) return;
    if (e.key === 'ArrowLeft' || e.key === 'ArrowRight') {
      e.preventDefault();
      target = clamp(target + (e.key === 'ArrowRight' ? 1 : -1), 0, 32);
      auto = false;
      updateControls();
    } else if (e.code === 'Space') {
      e.preventDefault();
      auto = !auto;
      updateControls();
    } else if (e.key.toLowerCase() === 'r') {
      reset();
    }
  });

  function bodyPose() {
    const brace = clamp(wind / 28, 0, 1);
    const hip = {x: 492 - brace * 12, y: 416};
    const shoulder = {x: 491 - brace * 34, y: 350 + brace * 3};
    const hand = {
      x: shoulder.x + 39 + brace * 8,
      y: shoulder.y - 17 + brace * 5
    };
    return {brace, hip, shoulder, hand};
  }

  function step(dt) {
    time += dt;
    if (auto) target = Math.min(32, target + dt * .7);
    wind += (target - wind) * (1 - Math.exp(-dt * 1.25));
    const gust = Math.max(0, wind * (1 + .055 * Math.sin(time * 1.8)
                                      + .025 * Math.sin(time * 4.3)));

    if (!released) {
      const push = (gust / 30) ** 2 * (inverted ? 2.9 : 2.4);
      const accel = push - 3.7 * theta - 2.5 * omega;
      omega += accel * dt;
      theta = clamp(theta + omega * dt, -.3, 1.35);

      if (!inverted) {
        inversionStress = clamp(inversionStress + (gust > 18.5 ? dt : -dt * 1.8), 0, 2);
        if (inversionStress > .8) {
          inverted = true;
          recoveryTime = 0;
        }
      } else {
        recoveryTime = gust < 9 ? recoveryTime + dt : 0;
        if (recoveryTime > 2.5) {
          inverted = false;
          inversionStress = 0;
        }
      }

      gripStress = clamp(gripStress + (gust > 27.5 ? dt : -dt * 1.3), 0, 3);
      if (gripStress > 1.3) {
        const hand = bodyPose().hand;
        released = true;
        free = {x: hand.x, y: hand.y, vx: 55 + gust * 4, vy: -105,
                angle: theta, spin: omega + 2.2};
      }
    } else {
      // The loose umbrella is a single rigid body acted on by drag and gravity.
      free.vx += (gust * 7 - free.vx) * .55 * dt;
      free.vy += 155 * dt;
      free.vy *= Math.exp(-.12 * dt);
      free.x += free.vx * dt;
      free.y += free.vy * dt;
      free.angle += free.spin * dt;
      free.spin *= Math.exp(-.15 * dt);
      if (free.y > ground - 8) {
        free.y = ground - 8;
        free.vy = -Math.abs(free.vy) * .3;
        free.vx *= .88;
        free.spin *= .8;
      }
    }

    const desiredCurve = inverted ? 57 : -43 + Math.min(14, gust * .38);
    curvature += (desiredCurve - curvature) * (1 - Math.exp(-dt * 5));

    for (const r of rain) {
      r.x += gust * 9 * r.depth * dt;
      r.y += (250 + gust * 2) * r.depth * dt;
      if (r.y > H + 30) { r.y = -30; r.x = Math.random() * (W + 100) - 100; }
      if (r.x > W + 40) { r.x = -40; r.y = Math.random() * H; }
    }
    for (const s of streaks) {
      s.x += (20 + gust * 8) * s.speed * dt;
      if (s.x > W + s.length) {
        s.x = -s.length;
        s.y = 40 + Math.random() * 410;
      }
    }

    readout.textContent = wind.toFixed(1);
    if (released) status.textContent = 'The umbrella got away. Reset to try again.';
    else if (inverted) status.textContent = 'Inside out — ease the wind for a while to let it recover.';
    else if (gripStress > .3) status.textContent = 'The grip is slipping.';
    else if (inversionStress > .25) status.textContent = 'The canopy is under strain.';
    else status.textContent = 'Holding steady';
    updateControls();
  }

  function line(points, color, width) {
    ctx.beginPath();
    ctx.moveTo(points[0][0], points[0][1]);
    for (let i = 1; i < points.length; i++) ctx.lineTo(points[i][0], points[i][1]);
    ctx.strokeStyle = color;
    ctx.lineWidth = width;
    ctx.lineCap = 'round';
    ctx.lineJoin = 'round';
    ctx.stroke();
  }

  function drawBackground() {
    const sky = ctx.createLinearGradient(0, 0, 0, H);
    sky.addColorStop(0, '#30434c');
    sky.addColorStop(.7, '#70837f');
    sky.addColorStop(1, '#9aa194');
    ctx.fillStyle = sky;
    ctx.fillRect(0, 0, W, H);

    ctx.fillStyle = 'rgba(33,53,59,.18)';
    ctx.beginPath();
    ctx.moveTo(0, 383);
    ctx.quadraticCurveTo(120, 315, 240, 370);
    ctx.quadraticCurveTo(360, 325, 475, 382);
    ctx.quadraticCurveTo(610, 315, 740, 380);
    ctx.quadraticCurveTo(875, 330, 1000, 365);
    ctx.lineTo(1000, ground);
    ctx.lineTo(0, ground);
    ctx.fill();

    for (const s of streaks) {
      ctx.strokeStyle = `rgba(220,235,224,${.05 + wind / 400})`;
      ctx.lineWidth = 1.5;
      ctx.beginPath();
      ctx.moveTo(s.x - s.length, s.y);
      ctx.quadraticCurveTo(s.x - s.length * .3, s.y - 6, s.x, s.y);
      ctx.stroke();
    }

    ctx.fillStyle = '#394b46';
    ctx.fillRect(0, ground, W, H - ground);
    ctx.fillStyle = '#64766b';
    ctx.fillRect(0, ground, W, 3);
    ctx.fillStyle = 'rgba(183,203,187,.15)';
    for (let i = 0; i < 11; i++) {
      const x = (i * 113 + 43) % W;
      ctx.fillRect(x, 540 + (i % 3) * 22, 45 + (i % 4) * 14, 2);
    }
  }

  function drawPerson(p) {
    const {hip, shoulder, brace} = p;
    // Both soles remain planted while the knees and torso shift.
    const leftFoot = [451, ground - 3];
    const rightFoot = [543, ground - 3];
    const leftKnee = [470 - brace * 10, 463];
    const rightKnee = [519 - brace * 7, 464];
    line([[hip.x, hip.y], leftKnee, leftFoot], '#202e31', 20);
    line([[hip.x + 8, hip.y], rightKnee, rightFoot], '#26373a', 20);
    line([[437, ground - 3], [456, ground - 3]], '#172328', 9);
    line([[531, ground - 3], [550, ground - 3]], '#172328', 9);

    line([[hip.x, hip.y], [shoulder.x, shoulder.y]], '#d4a66d', 34);
    line([[hip.x - 8, hip.y + 3], [shoulder.x - 9, shoulder.y + 8]], '#b78250', 5);

    // Far arm braces the shaft a little below the leading hand.
    const elbow2 = [shoulder.x + 6, shoulder.y + 30];
    line([[shoulder.x + 2, shoulder.y + 5], elbow2,
          [p.hand.x + 2, p.hand.y + 18]], '#b98755', 11);
    line([[p.hand.x - 2, p.hand.y + 18], [p.hand.x + 5, p.hand.y + 18]], '#e2b99b', 8);

    ctx.fillStyle = '#ddb69a';
    ctx.beginPath();
    ctx.arc(shoulder.x - 5, shoulder.y - 30, 17, 0, Math.PI * 2);
    ctx.fill();
    ctx.fillStyle = '#28383a';
    ctx.beginPath();
    ctx.arc(shoulder.x - 6, shoulder.y - 34, 17, Math.PI, Math.PI * 2);
    ctx.lineTo(shoulder.x + 11, shoulder.y - 30);
    ctx.quadraticCurveTo(shoulder.x - 5, shoulder.y - 38, shoulder.x - 22, shoulder.y - 28);
    ctx.fill();
    line([[shoulder.x + 8, shoulder.y - 28], [shoulder.x + 15, shoulder.y - 25]], '#28383a', 4);

    const elbow = [shoulder.x + 18, shoulder.y + 18 + brace * 3];
    const armEnd = released
      ? [p.hand.x + 12, p.hand.y + 12]
      : [p.hand.x, p.hand.y];
    line([[shoulder.x + 3, shoulder.y + 4], elbow, armEnd], '#d7a56c', 13);
    ctx.fillStyle = '#e1b79a';
    ctx.beginPath();
    ctx.arc(armEnd[0], armEnd[1], 6, 0, Math.PI * 2);
    ctx.fill();
  }

  function drawUmbrella(x, y, angle) {
    ctx.save();
    ctx.translate(x, y);
    ctx.rotate(angle);

    // Local coordinates: the hand is the origin; the shaft points upward.
    line([[0, 24], [0, -111]], '#303c3c', 5);
    ctx.strokeStyle = '#303c3c';
    ctx.lineWidth = 5;
    ctx.beginPath();
    ctx.moveTo(0, 22);
    ctx.lineTo(0, 32);
    ctx.quadraticCurveTo(0, 42, -10, 42);
    ctx.quadraticCurveTo(-19, 42, -19, 33);
    ctx.stroke();

    const hubY = -110;
    const half = 113;
    function canopyY(u) {
      // Curvature switches sign as the ribs pass through the flat state.
      return hubY - 12 - curvature * Math.pow(Math.abs(u), 1.65);
    }

    ctx.beginPath();
    ctx.moveTo(-half, canopyY(-1));
    for (let i = 1; i <= 40; i++) {
      const u = -1 + i / 20;
      ctx.lineTo(u * half, canopyY(u));
    }
    ctx.lineTo(half, canopyY(1) + 5);
    for (let i = 39; i >= 0; i--) {
      const u = -1 + i / 20;
      ctx.lineTo(u * half, canopyY(u) + 5);
    }
    ctx.closePath();
    ctx.fillStyle = inverted ? '#ba735c' : '#d99366';
    ctx.fill();

    // Filled canopy panels give the cross-section a visible surface.
    ctx.beginPath();
    ctx.moveTo(-half, canopyY(-1));
    for (let i = 1; i <= 40; i++) {
      const u = -1 + i / 20;
      ctx.lineTo(u * half, canopyY(u));
    }
    ctx.lineTo(0, hubY);
    ctx.closePath();
    ctx.fillStyle = inverted ? 'rgba(115,50,44,.28)' : 'rgba(255,205,149,.22)';
    ctx.fill();

    ctx.strokeStyle = '#633f3b';
    ctx.lineWidth = 2.5;
    ctx.beginPath();
    for (let i = 0; i <= 40; i++) {
      const u = -1 + i / 20;
      if (i === 0) ctx.moveTo(u * half, canopyY(u));
      else ctx.lineTo(u * half, canopyY(u));
    }
    ctx.stroke();

    for (const u of [-1, -.67, -.34, .34, .67, 1]) {
      const px = u * half, py = canopyY(u);
      ctx.beginPath();
      ctx.moveTo(0, hubY);
      ctx.quadraticCurveTo(px * .48, mix(hubY, py, .58) + 4, px, py);
      ctx.strokeStyle = 'rgba(84,55,50,.7)';
      ctx.lineWidth = 1.5;
      ctx.stroke();
    }
    ctx.fillStyle = '#343e3c';
    ctx.beginPath();
    ctx.arc(0, hubY, 4, 0, Math.PI * 2);
    ctx.fill();
    line([[0, hubY - 4], [0, hubY - 17]], '#343e3c', 3);
    ctx.restore();
  }

  function drawRain() {
    for (const r of rain) {
      const dx = wind * .16 * r.depth;
      const dy = r.length * r.depth;
      ctx.strokeStyle = `rgba(218,236,233,${.18 + r.depth * .15})`;
      ctx.lineWidth = r.depth;
      ctx.beginPath();
      ctx.moveTo(r.x, r.y);
      ctx.lineTo(r.x - dx, r.y - dy);
      ctx.stroke();
    }
  }

  function draw() {
    const dpr = Math.min(window.devicePixelRatio || 1, 2);
    const rect = canvas.getBoundingClientRect();
    const pw = Math.max(1, Math.round(rect.width * dpr));
    const ph = Math.max(1, Math.round(rect.height * dpr));
    if (canvas.width !== pw || canvas.height !== ph) {
      canvas.width = pw;
      canvas.height = ph;
    }
    ctx.setTransform(pw / W, 0, 0, ph / H, 0, 0);
    drawBackground();
    const p = bodyPose();
    drawPerson(p);
    if (released) drawUmbrella(free.x, free.y, free.angle);
    else drawUmbrella(p.hand.x, p.hand.y, theta);
    drawRain();

    ctx.fillStyle = 'rgba(232,244,235,.65)';
    ctx.font = '12px system-ui, sans-serif';
    ctx.fillText('WIND →', 25, 36);
  }

  function frame(ms) {
    if (!last) last = ms;
    const dt = Math.min((ms - last) / 1000, .05);
    last = ms;
    step(dt);
    draw();
    requestAnimationFrame(frame);
  }

  reset();
  requestAnimationFrame(frame);
})();
</script>
</body>
</html>

What it actually does

The canopy bends, flips, and can recover in a lull; the person leans while their feet stay planted. At higher sustained wind the umbrella escapes.

It is a stylized toy, not a structural simulation. The ribs are drawn rather than individually simulated, inversion and grip failure use thresholds, and the loose umbrella behaves like a simple rigid body. Rain is not blocked by the canopy, and the person’s grip does not realistically reposition as the shaft twists.

Attachments

openai/gpt-6.1-terra — page