Compare Grok 3 by xAI against GPT-5.1-Codex by OpenAI, context windows of 128K vs 400K, tested across 28 shared challenges. Updated March 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 understanding of number representation
Tests an AI's randomness and creativity
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 generate a complete, working landing page
Recreate an interactive, classic Mario level in a single HTML file.
Tests an AI's ability to replicate an existing UI with Tailwind CSS
Tests an AI's ability to create smooth web animations
Tests an AI's ability to create interactive web elements
16+ head-to-head challenges. All of them judged by real people.
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