GPT-5.1 Codex Max
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GPT-5.1 Codex Max vs OpenAI o3
Compare GPT-5.1 Codex Max and OpenAI o3, both from OpenAI, tested across 51 shared challenges. Updated February 2026.
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GPT-5.1 Codex MaxvsOpenAI o3
46 challenges
Why GPT-5.1 Codex Max?
Leads 1 of 1 benchmarks
Stronger on SWE-bench Verified77.9% vs 69.1%
8 months newerDec 2025
Why OpenAI o3?
No standout advantages
Favorites
GPT-5.1 Codex MaxOpenAI o3
12 / 46
Estimate Complexityreasoning
Tests an AI's ability to make educated estimates based on technical knowledge
OpenAI o3
No content available for this output.
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2 / 46
AI Board Game Logicreasoning
Tests an AI's ability to understand game rules and strategy
GPT-5.1 Codex Max
No content available for this output.
OpenAI o3
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3 / 46
Logic Puzzlereasoning
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
GPT-5.1 Codex Max
No content available for this output.
OpenAI o3
No content available for this output.
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4 / 46
Math Misconception Testreasoning
Tests an AI's understanding of number representation
GPT-5.1 Codex Max
No content available for this output.
OpenAI o3
No content available for this output.
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5 / 46
Stochastic Consistency Testanalysis
Tests an AI's randomness and creativity
GPT-5.1 Codex Max
No content available for this output.
OpenAI o3
Here are five jokes:
- Why did the scarecrow win an award? Because he was outstanding in his field.
- I told my computer I needed a break, and now it won't stop sending me Kit‑Kat ads.
- Parallel lines have so much in common—it's a shame they'll never meet.
- I started a band called 1023 MB. We still haven't gotten a gig.
- Why don't scientists trust atoms? Because they make up everything.
How many of these jokes are unique?
All five are distinct from one another, so the answer is 5.
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6 / 46
SVG Layout Challengeimage generation
Tests an AI's ability to generate vector graphics
GPT-5.1 Codex Max
No content available for this output.
OpenAI o3
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7 / 46
Xbox Controller SVG Artimage generation
Tests an AI's ability to create detailed SVG illustrations of gaming hardware
GPT-5.1 Codex Max
No content available for this output.
OpenAI o3
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8 / 46
Generate a Stand-Up Routineconversation
Tests an AI's humor and creative writing ability
GPT-5.1 Codex Max
No content available for this output.
OpenAI o3
(Spotlight comes up, mic squeals once.)
Hey everyone! Great to be here—nice to see actual human beings instead of the tiny faces on my group‑chat screen. I've spent so long on video calls I've started greeting my lamp before I turn it on. "Hey Karen, love that glow, girl."
So, I finally bought one of those smart speakers. I thought it would make me feel like Iron Man. Instead I feel like I adopted a very unmotivated intern. I'm like, "Play upbeat music," and it replies, "Here's a three‑hour podcast on the history of spoons." I asked it to remind me to work out; it waited until 11:59 p.m. and whispered, "You up?" My smart speaker is basically every guy I dated in college.
Speaking of relationships, I recently tried a dating app that lets you record a short audio bio. That's great, because if there's one thing more awkward than texting a stranger, it's leaving them a voicemail. Some guy said, "I'm looking for someone spontaneous." So I spontaneously unmatched him. Then I matched with a guy who listed his hobbies as "finance" and "manifesting." Congratulations, sir, you just invented prayer with extra steps.
Let's talk wellness culture. Everyone's drinking celery juice now. Celery is 95 percent water and 5 percent sadness. People swear it detoxes you. From what, joy? I tried a juice cleanse once. Day one, I'm like, "I feel so light!" Day two, I'm Googling the legal definition of cannibalism while staring at my roommate. Day three, I'd trade my social security number for a cracker.
I joined a yoga class to "center myself." First pose, the instructor says, "Just let your thoughts drift away." Great, because the only thought I have is, "Did I leave the stove on?" By the time I remember I don't even own a stove, class is over. The instructor thanks us for "sharing our practice." Ma'am, if you saw what went on in my head, you'd call an exorcist, not thank me.
Has anyone tried online grocery delivery? The substitutions are wild. I ordered quinoa; they sent me birdseed and a note that said, "Hope this works!" I asked for toilet paper; they delivered a single roll labeled "party streamer." At this point I'm convinced the store is just a guy named Todd making runs to a gas station. Now airlines are weighing passengers to "optimize fuel efficiency." Fantastic. Nothing like stepping on a scale in front of 150 strangers so the plane can save twelve dollars on kerosene. Watch, they'll start charging for emotional baggage: "Ma'am, that childhood trauma is gonna be an extra forty‑five bucks."
Before I go, quick life tip: when your phone tells you your screen time was up 30 percent last week, don't feel guilty. Just flip it around. "Wow, I was SO popular my phone worried about me." Self‑care is all branding, folks.
You've been awesome—give it up for yourselves, and remember, if life hands you lemons, ask for the receipt and buy wine instead. Good night!
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9 / 46
Realistic AI Interviewconversation
Tests an AI's ability to simulate personalities and predict future trends
GPT-5.1 Codex Max
No content available for this output.
OpenAI o3
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10 / 46
Satirical Fake News Headlineconversation
Tests an AI's humor and understanding of current events
GPT-5.1 Codex Max
No content available for this output.
OpenAI o3
No content available for this output.
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11 / 46
Character Voice Testconversation
Tests an AI's ability to write in distinct character voices
GPT-5.1 Codex Max
No content available for this output.
OpenAI o3
No content available for this output.
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12 / 46
Minimalist Landing Pageweb design
Tests an AI's ability to generate a complete, working landing page
GPT-5.1 Codex Max
OpenAI o3
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12 of 46