GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex vs OpenAI o4-mini
Compare GPT-5.3-Codex and OpenAI o4-mini, both from OpenAI, tested across 34 shared challenges. Updated February 2026.
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GPT-5.3-CodexvsOpenAI o4-mini
34 fights queued
Why GPT-5.3-Codex?
10 months newerFeb 2026
Why OpenAI o4-mini?
3x cheaper overall$1.10/M in · $4.40/M out
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GPT-5.3-CodexOpenAI o4-mini
12 / 34
Estimate Complexityreasoning
Tests an AI's ability to make educated estimates based on technical knowledge
OpenAI o4-mini
Nothing to show. The model went silent. Ominous.
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2 / 34
Logic Puzzlereasoning
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
OpenAI o4-mini
Nothing to show. The model went silent. Ominous.
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3 / 34
Stochastic Consistency Testanalysis
Tests an AI's randomness and creativity
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).
OpenAI o4-mini
Nothing to show. The model went silent. Ominous.
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4 / 34
SVG Layout Challengeimage generation
Tests an AI's ability to generate vector graphics
GPT-5.3-Codex
OpenAI o4-mini
Nothing to show. The model went silent. Ominous.
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5 / 34
Xbox Controller SVG Artimage generation
Tests an AI's ability to create detailed SVG illustrations of gaming hardware
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
OpenAI o4-mini
Nothing to show. The model went silent. Ominous.
Vote
6 / 34
Generate a Stand-Up Routineconversation
Tests an AI's humor and creative writing ability
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
OpenAI o4-mini
Nothing to show. The model went silent. Ominous.
Vote
7 / 34
Realistic AI Interviewconversation
Tests an AI's ability to simulate personalities and predict future trends
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
OpenAI o4-mini
Nothing to show. The model went silent. Ominous.
Vote
8 / 34
Satirical Fake News Headlineconversation
Tests an AI's humor and understanding of current events
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
OpenAI o4-mini
Nothing to show. The model went silent. Ominous.
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Sponsored
9 / 34
Minimalist Landing Pageweb design
Tests an AI's ability to generate a complete, working landing page
GPT-5.3-Codex
OpenAI o4-mini
Vote
10 / 34
Pokémon Battle UI Recreationweb design
Recreate an interactive, nostalgic Pokémon battle UI in a single HTML file.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
OpenAI o4-mini
Nothing to show. The model went silent. Ominous.
Vote
11 / 34
Mario Level UI Recreationweb design
Recreate an interactive, classic Mario level in a single HTML file.
GPT-5.3-Codex
OpenAI o4-mini
Nothing to show. The model went silent. Ominous.
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12 / 34
Linear App Cloneweb design
Tests an AI's ability to replicate an existing UI with Tailwind CSS
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
OpenAI o4-mini
Nothing to show. The model went silent. Ominous.
Vote
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