Claude Opus 4.5
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Claude Opus 4.5 vs OpenAI o4-mini
Compare Claude Opus 4.5 by Anthropic against OpenAI o4-mini by OpenAI, tested across 35 shared challenges. Updated February 2026.
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Claude Opus 4.5vsOpenAI o4-mini
35 challenges
Why Claude Opus 4.5?
Leads 1 of 1 benchmarks
Stronger on SWE-bench Verified80.9% vs 68.1%
7 months newerNov 2025
Why OpenAI o4-mini?
No standout advantages
Favorites
Claude Opus 4.5OpenAI o4-mini
12 / 35
Estimate Complexityreasoning
Tests an AI's ability to make educated estimates based on technical knowledge
OpenAI o4-mini
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2 / 35
Logic Puzzlereasoning
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
Claude Opus 4.5
No content available for this output.
OpenAI o4-mini
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3 / 35
Math Misconception Testreasoning
Tests an AI's understanding of number representation
Claude Opus 4.5
No content available for this output.
OpenAI o4-mini
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4 / 35
Stochastic Consistency Testanalysis
Tests an AI's randomness and creativity
Claude Opus 4.5
Here are 5 jokes:
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Why don't scientists trust atoms? Because they make up everything.
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What do you call a fish without eyes? A fsh.
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Why did the scarecrow win an award? Because he was outstanding in his field.
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I told my wife she was drawing her eyebrows too high. She looked surprised.
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What do you call a bear with no teeth? A gummy bear.
All 5 are unique - each joke has a different setup, punchline, and subject matter (atoms, fish, scarecrow, eyebrows, bear).
OpenAI o4-mini
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5 / 35
SVG Layout Challengeimage generation
Tests an AI's ability to generate vector graphics
Claude Opus 4.5
OpenAI o4-mini
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6 / 35
Xbox Controller SVG Artimage generation
Tests an AI's ability to create detailed SVG illustrations of gaming hardware
Claude Opus 4.5
OpenAI o4-mini
No content available for this output.
Vote
7 / 35
Generate a Stand-Up Routineconversation
Tests an AI's humor and creative writing ability
Claude Opus 4.5
Three Minutes
So I've been trying to drink more water. Everyone says drink more water. Eight glasses a day. And I'm doing it, I'm hydrated, I'm healthy, and I have to pee every forty-five minutes like I'm paying rent on the bathroom.
I was in a meeting last week—an important meeting—and I'm sitting there doing the math. "Okay, she's on slide 12, there's 40 slides, I can make it. I can make it." I could not make it. I did that thing where you stand up and just... leave. No explanation. Power move, honestly. Everyone probably thought I was so busy and important. Nope. Kidneys.
I turned 35 this year, and your body just starts... sending you notifications. Like a software update you keep ignoring. My knee cracked the other day and my wife looked at me like I'd been shot. I'm like, "No, that's just... that's just how I stand up now. From sitting. That's the sound of standing."
And doctors start asking you different questions at 35. "Any family history of—" YES. Whatever you're about to say, yes. Heart disease, diabetes, anxiety, bad decisions at buffets—it's all in there. My family tree is basically a WebMD search gone wrong.
I have a four-year-old, and nobody tells you that having kids means you're just gonna be wrong about everything for the rest of your life. My daughter corrected me on dinosaurs last week. I said "brontosaurus" and she hit me with, "Actually, it's apatosaurus, the brontosaurus was a misclassification."
She's FOUR. I don't even know where she learned that. I'm pretty sure I taught her the word "spoon" like eight months ago, and now she's out here peer-reviewing my paleontology.
Thank you, you've been a great crowd!
OpenAI o4-mini
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8 / 35
Realistic AI Interviewconversation
Tests an AI's ability to simulate personalities and predict future trends
Claude Opus 4.5
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OpenAI o4-mini
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9 / 35
Satirical Fake News Headlineconversation
Tests an AI's humor and understanding of current events
Claude Opus 4.5
No content available for this output.
OpenAI o4-mini
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10 / 35
Minimalist Landing Pageweb design
Tests an AI's ability to generate a complete, working landing page
Claude Opus 4.5
OpenAI o4-mini
Vote
11 / 35
Pokémon Battle UI Recreationweb design
Recreate an interactive, nostalgic Pokémon battle UI in a single HTML file.
Claude Opus 4.5
OpenAI o4-mini
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12 / 35
Mario Level UI Recreationweb design
Recreate an interactive, classic Mario level in a single HTML file.
Claude Opus 4.5
OpenAI o4-mini
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12 of 35