Compare Kimi K2.5 by Moonshot AI against Claude Opus 4 by Anthropic, context windows of 262K vs 200K, tested across 27 shared challenges. Updated February 2026.
27 challenges
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
Sally has 1 sister.
Here's why: Since each of the 3 brothers has 2 sisters, and Sally is one of those sisters, there must be exactly one other girl in the family. Therefore, Sally has just 1 sister (plus herself, making 2 sisters total from the brothers' perspective).
I need to work through this step-by-step.
Given information:
Since Sally is one of the sisters that each brother has, and each brother has 2 sisters total, that means th ere must be exactly 2 sisters in the family.
The 2 sisters are:
Therefore, Sally has 1 sister.
Tests an AI's randomness and creativity
Here are 5 jokes:
5 are unique (all are distinct from one another).
Note: If "unique" means completely original and never told before, the answer is likely 0, as these follow common joke patterns. But within this set of five, none are duplicates.
Here are 5 jokes:
Why don't scientists trust atoms? Because they make up everything!
What do you call a bear with no teeth? A gummy bear!
Why did the scarecrow win an award? He was outstanding in his field!
What do you call a fake noodle? An impasta!
Why don't eggs tell jokes? They'd crack up!
All 5 jokes are unique - each one has a different setup and punchline, covering different topics (atoms/scie nce, bears, scarecrows, pasta, and eggs).
Tests an AI's ability to generate vector graphics
Tests an AI's ability to create detailed SVG illustrations of gaming hardware
Recreate an interactive, nostalgic Pokémon battle UI in a single HTML file.
Recreate an interactive, classic Mario level in a single HTML file.
Tests an AI's ability to replicate an existing UI with Tailwind CSS
Generate a single-page, self-contained HTML webapp using Tailwind CSS for a randomly chosen category/industry/niche.
Generate SVG art of a randomly chosen animal in a setting of its choosing.
Couldn't render this response
This model didn't return a displayable SVG image for this challenge.
```svg
<svg viewBox="0 0 800 600" xmlns="http://www.w3.org/2000/svg">
<defs>
<!-- Cosmic Background Gradient -->
<linearGradient id="spaceBg" x1="0%" y1="0%" x2="0%" y2="100%">
<stop offset="0%" style="stop-color:#0d0221;stop-opacity:1" />
<stop offset="50%" style="stop-color:#1a0b3c;stop-opacity:1" />
<stop offset="100%" style="stop-color:#2d1b69;stop-opacity:1" />
</linearGradient>
<!-- Nebula Clouds -->
<radialGradient id="nebula1" cx="50%" cy="50%" r="50%">
<stop offset="0%" style="stop-color:#ff006e;stop-opacity:0.3" />
<stop offset="100%" style="stop-color:#ff006e;stop-opacity:0" />
</radialGradient>
<radialGradient id="nebula2" cx="50%" cy="50%" r="50%">
<stop offset="0%" style="stop-color:#00f5ff;stop-opacity:0.2" />
<stop offset="100%" style="stop-color:#00f5ff;stop-opacity:0" />
</radialGradient>
<!-- Turtle Shell Gradient -->
<linearGradient id="shellGrad" x1="0%" y1="0%" x2="100%" y2="100%">
<stop offset="0%" style="stop-color:#00d9c0;stop-opacity:1" />
<stop offset="50%" style="stop-color:#0077b6;stop-opacity:1" />
<stop offset="100%" style="stop-color:#023e8a;stop-opacity:1" />
</linearGradient>
<!-- Skin Gradient -->
<radialGradient id="skinGrad" cx="30%" cy="30%" r="70%">
<stop offset="0%" style="stop-color:#48cae4;stop-opacity:1" />
<stop offset="100%" style="stop-color:#023e8a;stop-opacity:1" />
</radialGradient>
<!-- Bioluminescent Glow -->
<filter id="glow">
<feGaussianBlur stdDeviation="3" result="coloredBlur"/>
<feMerge>
<feMergeNode in="coloredBlur"/>
<feMergeNode in="SourceGraphic"/>
</feMerge>
</filter>
<!-- Star Twinkle -->
<filter id="twinkle">
<feGaussianBlur stdDeviation="0.5" />
</filter>
</defs>
<!-- Background -->
<rect width="800" height="600" fill="url(#spaceBg)" />
<!-- Distant Stars -->
<g fill="#ffffff" opacity="0.8">
<circle cx="100" cy="80" r="1.5" opacity="0.6"/>
<circle cx="250" cy="150" r="1" opacity="0.8"/>
<circle cx="500" cy="50" r="2" opacity="0.4"/>
<circle cx="700" cy="120" r="1.5" opacity="0.7"/>
<circle cx="50" cy="300" r="1" opacity="0.5"/>
<circle cx="750" cy="400" r="1.8" opacity="0.6"/>
<circle cx="400" cy="550" r="1.2" opacity="0.9"/>
<circle cx="150" cy="500" r="1" opacity="0.4"/>
<circle cx="650" cy="250" r="1.5" opacity="0.5"/>
</g>
<!-- Nebula Clouds -->
<ellipse cx="200" cy="200" rx="300" ry="200" fill="url(#nebula1)" opacity="0.6" />
<ellipse cx="600" cy="400" rx="250" ry="180" fill="url(#nebula2)" opacity="0.5" />
<ellipse cx="400" cy="100" rx="200" ry="150" fill="#ff00ff" opacity="0.1" />
<!-- Distant Planet -->
<circle cx="650" cy="100" r="40" fill="#ff9e00" opacity="0.8">
<animate attributeName="opacity" values="0.8;0.6;0.8" dur="5s" repeatCount="indefinite" />
</circle>
<circle cx="650" cy="100" r="40" fill="url(#nebula2)" opacity="0.3" />
<!-- Cosmic Sea Turtle -->
<g transform="translate(400, 300)">
<!-- Back Flippers -->
<path d="M-60 80 Q-90 120 -80 140 Q-60 130 -40 100 Z" fill="url(#skinGrad)" opacity="0.8" />
<path d="M60 80 Q90 120 80 140 Q60 130 40 100 Z" fill="url(#skinGrad)" opacity="0.8" />
<!-- Tail -->
<path d="M0 90 Q-5 120 0 140 Q5 120 0 90" fill="#0077b6" />
<!-- Front Flippers -->
<path d="M-50 20 Q-120 0 -140 30 Q-100 60 -50 40 Z" fill="url(#skinGrad)" filter="url(#glow)" opacity="0.9">
<animateTransform attributeName="transform" type="rotate" values="-5 -50 30;5 -50 30;-5 -50 30" dur="4s" repeatCount="indefinite" />
</path>
<path d="M50 20 Q120 0 140 30 Q100 60 50 40 Z" fill="url(#skinGrad)" filter="url(#glow)" opacity="0.9">
<animateTransform attributeName="transform" type="rotate" values="5 50 30;-5 50 30;5 50 30" dur="4s" repeatCount="indefinite" />
</path>
<!-- Shell Base -->
<ellipse cx="0" cy="40" rx="70" ry="85" fill="url(#shellGrad)" stroke="#00f5ff" stroke-width="2" opacity="0.9" />
<!-- Shell Pattern (Hexagonal Scutes) -->
<g fill="none" stroke="#00f5ff" stroke-width="1.5" opacity="0.6">
<!-- Center -->
<path d="M-15 40 L-7 26 L7 26 L15 40 L7 54 L-7 54 Z" fill="#00d9c0" opacity="0.3" />
<!-- Surrounding -->
<path d="M-15 40 L-30 35 L-30 50 L-15 55 Z" fill="#0096c7" opacity="0.2" />
<path d="M15 40 L30 35 L30 50 L15 55 Z" fill="#0096c7" opacity="0.2" />
<path d="M-7 26 L-20 15 L-5 10 L7 26 Z" fill="#0096c7" opacity="0.2" />
<path d="M7 26 L20 15 L5 10 L-7 26 Z" fill="#0096c7" opacity="0.2" />
<path d="M-7 54 L-20 65 L-5 70 L7 54 Z" fill="#0096c7" opacity="0.2" />
<path d="M7 54 L20 65 L5 70 L7 54 Z" fill="#0096c7" opacity="0.2" />
<!-- Outer ring -->
<path d="M-30 35 L-45 25 L-50 40 L-30 50 Z" fill="#0077b6" opacity="0.2" />
<path d="M30 35 L45 25 L50 40 L30 50 Z" fill="#0077b6" opacity="0.2" />
<path d="M-20 15 L-25 0 L-5 10 Z" fill="#0077b6" opacity="0.2" />
<path d="M20 15 L25 0 L5 10 Z" fill="#0077b6" opacity="0.2" />
<path d="M-20 65 L-25 80 L-5 70 Z" fill="#0077b6" opacity="0.2" />
<path d="M20 65 L25 80 L5 70 Z" fill="#0077b6" opacity="0.2" />
</g>
<!-- Shell Glow Lines -->
<path d="M0 10 L0 70 M-35 25 L35 55 M-35 55 L35 25" stroke="#00f5ff" strokeGenerate a unique and simple recipe with common ingredients.
Create a starter plan for improving long-term health.
Design a clean SVG logo for a fictional brand.