GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex vs OpenAI o3
Compare GPT-5.3-Codex and OpenAI o3, both from OpenAI, tested across 50 shared challenges. Updated February 2026.
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GPT-5.3-CodexvsOpenAI o3
45 fights queued
Why GPT-5.3-Codex?
3.1x cheaper overall$1.75/M in · $14.00/M out
10 months newerFeb 2026
Why OpenAI o3?
Dead even. This one’s a coin flip.
Favorites
GPT-5.3-CodexOpenAI o3
12 / 45
Estimate Complexityreasoning
Tests an AI's ability to make educated estimates based on technical knowledge
OpenAI o3
Nothing to show. The model went silent. Ominous.
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2 / 45
AI Board Game Logicreasoning
Tests an AI's ability to understand game rules and strategy
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
OpenAI o3
Nothing to show. The model went silent. Ominous.
Vote
3 / 45
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 o3
Nothing to show. The model went silent. Ominous.
Vote
4 / 45
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 o3
Nothing to show. The model went silent. Ominous.
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5 / 45
SVG Layout Challengeimage generation
Tests an AI's ability to generate vector graphics
GPT-5.3-Codex
OpenAI o3
Nothing to show. The model went silent. Ominous.
Vote
6 / 45
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 o3
Nothing to show. The model went silent. Ominous.
Vote
7 / 45
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 o3
Nothing to show. The model went silent. Ominous.
Vote
8 / 45
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 o3
Nothing to show. The model went silent. Ominous.
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Sponsored
9 / 45
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 o3
Nothing to show. The model went silent. Ominous.
Vote
10 / 45
Character Voice Testconversation
Tests an AI's ability to write in distinct character voices
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
OpenAI o3
Nothing to show. The model went silent. Ominous.
Vote
11 / 45
Minimalist Landing Pageweb design
Tests an AI's ability to generate a complete, working landing page
GPT-5.3-Codex
OpenAI o3
Vote
12 / 45
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 o3
Nothing to show. The model went silent. Ominous.
Vote
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