Compare GPT-5.1 Codex Max by OpenAI against Gemini 2.5 Pro (I/O Edition) by Google AI, tested across 35 shared challenges. Updated February 2026.
35 challenges
Tests an AI's ability to make educated estimates based on technical knowledge
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
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 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, nostalgic Pokémon battle UI in a single HTML file.
Recreate an interactive, classic Mario level in a single HTML file.
