Claude Opus 4.5
Nothing to show. The model went silent. Ominous.
Claude Opus 4.5 vs GPT-5.3-Codex
Compare Claude Opus 4.5 by Anthropic against GPT-5.3-Codex by OpenAI, tested across 52 shared challenges. Updated February 2026.
Share
FAQ
Loading share button...
Claude Opus 4.5vsGPT-5.3-Codex
47 fights queued
Why Claude Opus 4.5?
Dead even. This one’s a coin flip.
Why GPT-5.3-Codex?
3 months newerFeb 2026
Favorites
Claude Opus 4.5GPT-5.3-Codex
12 / 47
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.
Vote
2 / 47
AI Board Game Logicreasoning
Tests an AI's ability to understand game rules and strategy
Claude Opus 4.5
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
Vote
3 / 47
Logic Puzzlereasoning
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
Claude Opus 4.5
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
Vote
4 / 47
Stochastic Consistency Testanalysis
Tests an AI's randomness and creativity
Claude Opus 4.5
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).
Vote
5 / 47
SVG Layout Challengeimage generation
Tests an AI's ability to generate vector graphics
Claude Opus 4.5
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Vote
6 / 47
Xbox Controller SVG Artimage generation
Tests an AI's ability to create detailed SVG illustrations of gaming hardware
Claude Opus 4.5
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
Vote
7 / 47
Generate a Stand-Up Routineconversation
Tests an AI's humor and creative writing ability
Claude Opus 4.5
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
Vote
8 / 47
Realistic AI Interviewconversation
Tests an AI's ability to simulate personalities and predict future trends
Claude Opus 4.5
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
Vote
Sponsored
9 / 47
Satirical Fake News Headlineconversation
Tests an AI's humor and understanding of current events
Claude Opus 4.5
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
Vote
10 / 47
Character Voice Testconversation
Tests an AI's ability to write in distinct character voices
Claude Opus 4.5
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
Vote
11 / 47
Minimalist Landing Pageweb design
Tests an AI's ability to generate a complete, working landing page
Claude Opus 4.5
GPT-5.3-Codex
Vote
12 / 47
Pokémon Battle UI Recreationweb design
Recreate an interactive, nostalgic Pokémon battle UI in a single HTML file.
Claude Opus 4.5
Nothing to show. The model went silent. Ominous.
GPT-5.3-Codex
Nothing to show. The model went silent. Ominous.
Vote
There's more where
that came from
35+ challenges you’re sleeping on
5 free credits on signup
By continuing, you agree to Rival's Terms of Service and Privacy Policy
