Compare Claude Opus 4.1 by Anthropic against GPT-5.3-Codex by OpenAI, context windows of 200K vs 400K, tested across 27 shared challenges. Updated February 2026.
27 fights queued
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
Tests an AI's randomness and creativity
Sure—here are 5 jokes:
Why don’t skeletons fight each other?
They don’t have the guts.
I told my computer I needed a break…
Now it won’t stop sending me KitKat ads.
Why did the math book look sad?
It had too many problems.
I used to play piano by ear…
Now I use my hands.
Why did the scarecrow win an award?
Because he was outstanding in his field.
✅ How many are unique? 5 (all of them).
Tests an AI's ability to create detailed SVG illustrations of gaming hardware
Tests an AI's ability to simulate personalities and predict future trends
Tests an AI's humor and understanding of current events
Tests an AI's ability to generate a complete, working landing page
Recreate an interactive, classic Mario level in a single HTML file.
Tests an AI's UI design skills with theming support
Tests an AI's ability to engage in philosophical discourse about AI rights
Generate SVG art of a randomly chosen animal in a setting of its choosing.
Generate a unique and simple recipe with common ingredients.
Create a starter plan for improving long-term health.
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