OpenAI GPT-5.3 Spark (xhigh)

OpenAIFebruary 2026

open raw ↗pit it against…

What it wrote

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1.0"
    />
    <title>Neon Pulse Engine</title>
    <link rel="stylesheet" href="styles.css" />
  </head>
  <body>
    <div class="aurora" aria-hidden="true"></div>
    <main class="shell">
      <header class="title-card">
        <p class="kicker">Incremental Console</p>
        <h1>Neon Pulse Engine</h1>
        <p class="subtitle">
          Build a glowing production empire. Tap, automate, upgrade, and ascend.
        </p>
      </header>

      <section class="layout">
        <section class="panel primary">
          <div class="stats-grid">
            <article class="stat">
              <p>Pulse</p>
              <h2 id="energyAmount">0</h2>
            </article>
            <article class="stat">
              <p>All-Time Pulse</p>
              <h2 id="totalEnergyAmount">0</h2>
            </article>
            <article class="stat">
              <p>Clicks</p>
              <h2 id="clickAmount">0</h2>
            </article>
            <article class="stat">
              <p>Stars</p>
              <h2 id="starAmount">0</h2>
            </article>
            <article class="stat">
              <p>Per Click</p>
              <h2 id="perClickAmount">1.00</h2>
            </article>
            <article class="stat">
              <p>Per Second</p>
              <h2 id="perSecondAmount">0.00</h2>
            </article>
          </div>

          <div class="click-zone">
            <button id="pulseButton" class="pulse-button" aria-label="Generate pulse energy">
              <span id="pulseValue">+1</span>
              <span>PULSE!</span>
            </button>
            <p id="nextPulse">Click to convert energy</p>
          </div>

          <div id="floatLayer" aria-hidden="true"></div>

          <div class="action-row">
            <button id="ascendButton" class="action-button">Ascend</button>
            <button id="saveButton" class="action-button">Save</button>
            <button id="resetButton" class="action-button danger">New Universe</button>
          </div>
          <p id="ascendHint" class="hint"></p>
        </section>

        <section class="panel generators">
          <h2>Generators</h2>
          <div id="generators" class="list"></div>
        </section>

        <section class="panel upgrades">
          <h2>Upgrades</h2>
          <div id="upgrades" class="list"></div>
        </section>

        <section class="panel achievement-list">
          <h2>Achievements</h2>
          <div id="achievements" class="list achievement-list"></div>
        </section>
      </section>
    </main>

    <div id="toastZone" aria-live="polite"></div>
    <script src="script.js" defer></script>
  </body>
</html>