Compare Claude Opus 4.1 by Anthropic against o3 Mini by OpenAI, context windows of 200K vs 64K, tested across 21 shared challenges. Updated February 2026.
21 challenges
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
Let me work through this step-by-step.
Sally has 3 brothers.
Each of Sally's brothers has 2 sisters.
Since Sally is a girl, she is one of the sisters that each brother has.
If each brother has 2 sisters total, and Sally is one of them, then there must be 1 other sister besides Sally.
Therefore, Sally has 1 sister.
Tests an AI's randomness and creativity
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 each other up!
All 5 jokes are unique - each one has a different setup and punchline with no repeats.
Why did the math book look sad?
Because it had too many problems.
What do you call an alligator in a vest?
An investigator.
What did the zero say to the eight?
Nice belt!
Why did the bicycle fall over?
Because it was two-tired.
How does a penguin build its house?
Igloos it together.
Each of these five jokes is unique, so there are 5 unique jokes.
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 a unique and simple recipe with common ingredients.
Create a starter plan for improving long-term health.
Recreate a classic, retro, macOS Desktop UI — make it interactive and nostalgic, make it as interactive as you can, you can be creative.. Feel free to showcase your skills. The entire application must be a single-page self-contained HTML file.
