Compare Claude 3 Haiku by Anthropic against GPT-5.1-Codex by OpenAI, context windows of 200K vs 400K, tested across 33 shared challenges. Updated February 2026.
28 challenges
Tests an AI's randomness and creativity
Here are 5 jokes:
Why can't a bicycle stand up on its own? It's two-tired!
Why do cows wear bells? Their horns don't work!
Why can't a bike stand up by itself? It's two-tired!
Why do cows wear tags? Because their horns don't work!
Why do cows have hooves? Because they lactose!
Out of these 5 jokes, only 4 are unique. The first and third jokes are the same, just with a slight variation in wording.
Here are 5 jokes:
All 5 jokes are unique.
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
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 create smooth web animations
Tests an AI's ability to engage in philosophical discourse about AI rights
Tests an AI's ability to create a detailed world map in SVG format
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.
Generate a unique and simple recipe with common ingredients.
