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<title>Why CDN Imports Matter in LLM Benchmarks - Lynchmark Analysis</title>
<meta name="description" content="Most LLM benchmarks test code in isolation. Lynchmark tests real-world skills: finding correct CDN URLs and making code work in actual browsers.">
<meta property="og:title" content="Why CDN Imports Matter in LLM Benchmarks">
<meta property="og:description" content="Discover why testing LLMs with real CDN imports and browser execution reveals crucial practical skills that isolated benchmarks miss.">
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<meta property="og:url" content="https://lynchmark.com/blog/why-cdn-imports-matter">
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"@type": "BlogPosting",
"headline": "Why CDN Imports Matter in LLM Benchmarks",
"datePublished": "2024-06-15",
"author": {"@type": "Organization", "name": "Lynchmark"},
"description": "Testing LLMs with real CDN imports reveals practical skills that isolated benchmarks miss entirely."
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<a href="/" class="text-gray-500 hover:text-blue-600 transition">Lynchmark</a>
<span class="text-gray-300">/</span>
<a href="/blog" class="text-gray-500 hover:text-blue-600 transition">Blog</a>
<span class="text-gray-300">/</span>
<span class="font-medium text-gray-900">CDN Imports</span>
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<article class="bg-white rounded-2xl border border-gray-200 shadow-sm overflow-hidden">
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<div class="inline-flex items-center rounded-full border border-orange-200 bg-orange-50 text-orange-700 text-xs font-bold px-3 py-1 mb-4 uppercase tracking-wide">Technical Insight</div>
<h1 class="text-3xl md:text-4xl font-bold text-gray-900 mb-4">Why CDN Imports Matter in LLM Benchmarks</h1>
<p class="text-lg text-gray-600">
Most benchmarks test code in isolation. Lynchmark tests what actually matters: finding correct CDN URLs and making code work in real browsers.
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<h2 class="text-xl font-bold text-gray-900 mb-3">The Hidden Skill Gap</h2>
<p class="text-gray-600 leading-relaxed mb-4">
When you ask an LLM to "write a function that uses lodash," most benchmarks will accept any code that <em>looks</em> like it uses lodash. But in the real world, that code needs to:
</p>
<ul class="text-gray-600 leading-relaxed space-y-2 mb-6 pl-5 list-disc">
<li>Find the correct CDN URL for the library</li>
<li>Use the proper import syntax for that CDN</li>
<li>Handle the library's actual API (not just what the LLM thinks it should be)</li>
<li>Execute successfully in a browser environment</li>
</ul>
<p class="text-gray-600 leading-relaxed">
This is where many LLMs fail spectacularly. They might generate perfect-looking algorithm code, but use non-existent CDN URLs or incorrect import patterns.
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<h2 class="text-xl font-bold text-gray-900 mb-3">Real-World Example: The scrypt-js Test</h2>
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In Test #10, models must import <code>scrypt-js</code> from a CDN. Here's what separates passing from failing implementations:
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<h4 class="font-bold text-red-700 mb-2">❌ Common Failure</h4>
<pre class="mono text-xs text-red-800 bg-red-100 p-3 rounded overflow-x-auto">import { scrypt } from 'https://cdn.skypack.dev/scrypt-js';
// Wrong: Skypack doesn't export named 'scrypt' this way</pre>
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<h4 class="font-bold text-green-700 mb-2">✅ Correct Solution</h4>
<pre class="mono text-xs text-green-800 bg-green-100 p-3 rounded overflow-x-auto">const { scrypt } = await import('https://cdn.jsdelivr.net/npm/scrypt-js@3.0.1/+esm');
// Correct: Uses jsDelivr with proper destructuring</pre>
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<p class="text-gray-600 leading-relaxed">
The difference isn't just syntax—it's about knowing which CDNs work for which libraries, and how those libraries are actually packaged for browser use.
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<h3 class="font-bold text-gray-900 mb-2">What Traditional Benchmarks Miss</h3>
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Standard coding benchmarks test algorithmic thinking in isolation. They don't verify that the generated code can actually <em>run</em> in a real environment with real dependencies.
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<h3 class="font-bold text-gray-900 mb-2">What Lynchmark Captures</h3>
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Practical deployment knowledge: Which CDN hosts which libraries, how to import them correctly, and whether the resulting code executes successfully in a browser with no build step.
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<section class="border-t border-gray-200 pt-8">
<h2 class="text-xl font-bold text-gray-900 mb-4">The Takeaway</h2>
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<p class="text-blue-900 font-medium">
When evaluating LLMs for real-world coding tasks, test their ability to work with actual dependencies in real environments. Perfect algorithm implementation means nothing if the code can't import its required libraries.
</p>
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<p class="text-gray-600 mt-4">
This is why Lynchmark runs every generated solution in a real browser with real CDN imports—it's the only way to know if the code actually works.
</p>
</section>
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</article>
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