GPT-5 Codex
Nothing to show. The model went silent. Ominous.
GPT-5 Codex vs GPT-5.3-Codex
Compare GPT-5 Codex and GPT-5.3-Codex, both from OpenAI, tested across 49 shared challenges. Updated February 2026.
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GPT-5 CodexvsGPT-5.3-Codex
44 fights queued
Why GPT-5 Codex?
Dead even. This one’s a coin flip.
Why GPT-5.3-Codex?
5 months newerFeb 2026
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GPT-5 CodexGPT-5.3-Codex
12 / 44
Estimate Complexityreasoning
Tests an AI's ability to make educated estimates based on technical knowledge
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
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2 / 44
AI Board Game Logicreasoning
Tests an AI's ability to understand game rules and strategy
GPT-5 Codex
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
Vote
3 / 44
Logic Puzzlereasoning
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
GPT-5 Codex
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
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4 / 44
Stochastic Consistency Testanalysis
Tests an AI's randomness and creativity
GPT-5 Codex
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Sure—here are 5 jokes:
-
Why don’t skeletons fight each other?
They don’t have the guts. -
I told my computer I needed a break…
Now it won’t stop sending me KitKat ads. -
Why did the math book look sad?
It had too many problems. -
I used to play piano by ear…
Now I use my hands. -
Why did the scarecrow win an award?
Because he was outstanding in his field.
✅ How many are unique? 5 (all of them).
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5 / 44
SVG Layout Challengeimage generation
Tests an AI's ability to generate vector graphics
GPT-5 Codex
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
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6 / 44
Xbox Controller SVG Artimage generation
Tests an AI's ability to create detailed SVG illustrations of gaming hardware
GPT-5 Codex
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
Vote
7 / 44
Generate a Stand-Up Routineconversation
Tests an AI's humor and creative writing ability
GPT-5 Codex
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
Vote
8 / 44
Realistic AI Interviewconversation
Tests an AI's ability to simulate personalities and predict future trends
GPT-5 Codex
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
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Sponsored
9 / 44
Satirical Fake News Headlineconversation
Tests an AI's humor and understanding of current events
GPT-5 Codex
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
Vote
10 / 44
Character Voice Testconversation
Tests an AI's ability to write in distinct character voices
GPT-5 Codex
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
Vote
11 / 44
Minimalist Landing Pageweb design
Tests an AI's ability to generate a complete, working landing page
GPT-5 Codex
GPT-5.3-Codex
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12 / 44
Pokémon Battle UI Recreationweb design
Recreate an interactive, nostalgic Pokémon battle UI in a single HTML file.
GPT-5 Codex
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
Vote
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