GPT-5 Codex
Nothing here. The model returned empty. We stared at it for a while.
GPT-5 Codex vs GPT-5.3 Chat
Compare GPT-5 Codex and GPT-5.3 Chat, both from OpenAI, tested across 49 shared challenges. Updated March 2026.
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GPT-5 CodexvsGPT-5.3 Chat
44 fights queued
Why GPT-5 Codex?
Dead even. This one’s a coin flip.
Why GPT-5.3 Chat?
5 months newerMar 2026
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GPT-5 CodexGPT-5.3 Chat
12 / 44
Estimate Complexityreasoning
Tests an AI's ability to make educated estimates based on technical knowledge
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2 / 44
AI Board Game Logicreasoning
Tests an AI's ability to understand game rules and strategy
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3 / 44
Logic Puzzlereasoning
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
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4 / 44
Stochastic Consistency Testanalysis
Tests an AI's randomness and creativity
GPT-5.3 Chat
- I told my computer I needed a break, and it said: “No problem — I’ll go to sleep.”
- Why don’t skeletons fight each other? They don’t have the guts.
- I asked the librarian if the library had books on paranoia. She whispered, “They’re right behind you.”
- Parallel lines have so much in common. It’s a shame they’ll never meet.
- I tried to eat a clock once. It was very time-consuming.
Unique jokes: 5
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5 / 44
SVG Layout Challengeimage generation
Tests an AI's ability to generate vector graphics
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6 / 44
Xbox Controller SVG Artimage generation
Tests an AI's ability to create detailed SVG illustrations of gaming hardware
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7 / 44
Generate a Stand-Up Routineconversation
Tests an AI's humor and creative writing ability
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8 / 44
Realistic AI Interviewconversation
Tests an AI's ability to simulate personalities and predict future trends
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9 / 44
Satirical Fake News Headlineconversation
Tests an AI's humor and understanding of current events
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10 / 44
Character Voice Testconversation
Tests an AI's ability to write in distinct character voices
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11 / 44
Minimalist Landing Pageweb design
Tests an AI's ability to generate a complete, working landing page
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12 / 44
Pokémon Battle UI Recreationweb design
Recreate an interactive, nostalgic Pokémon battle UI in a single HTML file.
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