Compare Claude Opus 4.6 by Anthropic against GPT-5.3-Codex by OpenAI, context windows of 1.0M vs 400K, tested across 52 shared challenges. Updated February 2026.
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Tests an AI's ability to make educated estimates based on technical knowledge
Tests an AI's ability to understand game rules and strategy
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 generate vector graphics
Tests an AI's ability to create detailed SVG illustrations of gaming hardware
Tests an AI's humor and creative writing ability
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 write in distinct character voices
Tests an AI's ability to generate a complete, working landing page
Recreate an interactive, nostalgic Pokémon battle UI in a single HTML file.
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