Compare GPT-5 Nano by OpenAI against Claude Opus 4.1 by Anthropic, in 4 community votes, claude opus 4.1 wins 75% of head-to-head duels, tested across 25 shared challenges. Updated February 2026.
In 4 community votes, Claude Opus 4.1 wins 75% of head-to-head duels. Based on blind community voting from the RIVAL open dataset of 4+ human preference judgments for this pair.
25 challenges
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
Tests an AI's randomness and creativity
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 SVG art of a randomly chosen animal in a setting of its choosing.
Generate a unique and simple recipe with common ingredients.
Create a starter plan for improving long-term health.
