Compare GPT-5 Codex by OpenAI against Inception: Mercury by Inception, in 7 community votes, gpt-5 codex wins 100% of head-to-head duels, tested across 28 shared challenges. Updated February 2026.
In 7 community votes, GPT-5 Codex wins 100% of head-to-head duels. GPT-5 Codex leads in Image Generation, Web Design. Based on blind community voting from the RIVAL open dataset of 7+ human preference judgments for this pair.
23 challenges
Tests an AI's randomness and creativity
Unique jokes: 5
Here are five jokes for you:
Why don't skeletons fight each other? Because they don't have the guts.
I told my wife she was drawing her eyebrows too high. She looked surprised.
Why did the scarecrow win an award? Because he was outstanding in his field.
What do you call a fake noodle? An impasta.
Why don't we ever tell secrets on a farm? Because the potatoes have eyes, the corn has ears, and the beans stalk.
All five jokes are unique in their setup and punchline.
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
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 a detailed world map in SVG format
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.
Design a simple interactive virtual pet.
