Updated Sep 29, 2025

Our Verdict

Claude Sonnet 4.5Winner

GPT-5 MiniRunner-up

Pick Claude Sonnet 4.5. In 17 blind votes, Claude Sonnet 4.5 wins 67% of the time. That's not luck.

Claude Sonnet 4.5 particularly excels in Web Design, Image Generation, Reasoning. GPT-5 Mini is 7.5x cheaper per token — worth considering if cost matters.

Clear winner

Writing DNA

Style Comparison

Similarity

100%

Claude Sonnet 4.5 uses 490.1x more bold

Claude Sonnet 4.5

GPT-5 Mini

64%Vocabulary62%

94wSentence Length21w

0.48Hedging0.16

4.9Bold0.0

8.0Lists3.4

0.45Emoji0.00

1.91Headings0.00

0.07Transitions0.05

Based on 20 + 15 text responses

vs

Ask them anything yourself

Claude Sonnet 4.5

GPT-5 Mini

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026

Free preview13 of 58 slides

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FAQ

Common questions

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Claude Sonnet 4.5vsGPT-5 Mini

38 fights queued

Why Claude Sonnet 4.5?

2 months newerSep 2025

Why GPT-5 Mini?

7.8x cheaper overall$0.25/M in · $2.00/M out

Claude Sonnet 4.5GPT-5 Mini

Input price

$3.00/M

$0.25/M

Output price

$15.00/M

$2.00/M

Context

200K

—

Released

Sep 2025

Aug 2025

Favorites

Claude Sonnet 4.5GPT-5 Mini

Movie

2001: A Space Odyssey

2001: A Space Odyssey

—

Album

Kind of Blue

—

Book

Metamorphosis

Metamorphosis

—

City

Amsterdam

—

Game

Portal 2

Portal 2

Shooter, Puzzle4.6

—

12 / 38

01

Estimate Complexityreasoning

Tests an AI's ability to make educated estimates based on technical knowledge

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5 Mini

GPT-5 Mini

Openai · Aug 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

2 / 38

02

AI Board Game Logicreasoning

Tests an AI's ability to understand game rules and strategy

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025svg

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5 Mini

GPT-5 Mini

Openai · Aug 2025svg

Try this prompt

Vote

3 / 38

03

Logic Puzzlereasoning

Tests an AI's ability to solve a simple but potentially confusing logic puzzle

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5 Mini

GPT-5 Mini

Openai · Aug 2025text

1

Explanation: The three brothers share the same two sisters (Sally and one other girl). Counting sisters for Sally excludes herself, so she has one sister.

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4 / 38

04

Math Misconception Testreasoning

Tests an AI's understanding of number representation

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5 Mini

GPT-5 Mini

Openai · Aug 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

5 / 38

05

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5 Mini

GPT-5 Mini

Openai · Aug 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

6 / 38

06

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025svg

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5 Mini

GPT-5 Mini

Openai · Aug 2025svg

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

Sponsored

7 / 38

07

Xbox Controller SVG Artimage generation

Tests an AI's ability to create detailed SVG illustrations of gaming hardware

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025svg

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5 Mini

GPT-5 Mini

Openai · Aug 2025svg

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

8 / 38

08

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5 Mini

GPT-5 Mini

Openai · Aug 2025text

You ever notice how being an adult is basically a long string of decisions you were never trained for? When you're a kid, your biggest choice is grape or orange. As an adult, you find yourself standing in front of a dishwasher, holding a mysterious utensil, and thinking: do I scrub this like a weapon or is the rinse cycle going to take care of my dignity? There should be a diploma for that. "Congrats, you completed 'Appliance Judgment 101.'"

And technology was supposed to make that easier, remember? We bought smart speakers to feel like the future. Now I live with a tiny passive-aggressive roommate who listens to everything and pretends not to. I ask it to play jazz and it plays a lecture about sleep cycles. I say, "Turn the lights down." It asks, "Are you sure?" Who is running this household — me or the light bulb's therapist?

The other day I asked it to set a reminder to call my mom. It responded, "I've scheduled self-reflection for 6 p.m." I didn't know whether to be grateful or to feel judged. At least when the toaster judges you, it's honest. This thing is trying to nudge me into becoming a better person. I miss the bluntness of appliances. The blender never told you you could be more.

We externalize everything now. We outsource our taste, our fitness, our love lives. Dating apps are like shopping for human-shaped IKEA furniture. Everyone's professional at being casual. Profiles are all the same: "I love traveling, dogs, and experiencing things." You don't love experiencing things, Susan. You love deciding between two brunch spots and then complaining. There's no risk in a bio. It's curated life, not living.

And fitness culture has gone fullbrand. When did sweat become a lifestyle? Gyms now have class names that sound like secret societies. You walk in and it's "Forge," "Rise," "ZenBurn." I went to one called "Eclipse." I thought I accidentally walked into solar mythology. The instructor says, "Find your center." I've already found my center — it's buried under a Netflix subscription and three missed calls.

Therapy has become part of the subscription economy too. People check in with their therapists like they're checking the weather. "How's your week?" "Mostly cloudy with a chance of setbacks." We treat therapists like life mechanics: "Can you reset my motivation? Maybe do an update?" No, you can't install focus 2.0 without sacrifice; there is no Wi-Fi password for happiness.

Which brings me back to my smart speaker. If you can make a device that catalogs your music, transcribes your arguments, and tells you jokes at 3 a.m., why can't it make decisions for you? I tried that. I said, "Pick dinner." It booked a reservation at a restaurant called 'Responsibility.' I went, and the waiter asked if I wanted a side of life choices. I paid, and now my smart speaker sends me quotes from my own diary. That’s when I realized: the devices aren't the problem. The problem is we've made them our conscience. And my conscience is now available in a 30-day trial.

So here's my plan: I'm going to keep the device but change the wake word to "Mom." Suddenly it won't just play music — it'll guilt me into being on time, doing laundry, and calling back. If we’re outsourcing adulthood, might as well outsource the nagging too. At least then, when I'm judged for my life choices, it'll come with love and a follow-up reminder.

Try this prompt

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9 / 38

09

Character Voice Testconversation

Tests an AI's ability to write in distinct character voices

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5 Mini

GPT-5 Mini

Openai · Aug 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

10 / 38

10

Pokémon Battle UI Recreationweb design

Recreate an interactive, nostalgic Pokémon battle UI in a single HTML file.

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025website

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5 Mini

GPT-5 Mini

Openai · Aug 2025website

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

11 / 38

11

Mario Level UI Recreationweb design

Recreate an interactive, classic Mario level in a single HTML file.

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025website

Try this prompt

GPT-5 Mini

GPT-5 Mini

Openai · Aug 2025website

Try this prompt

Vote

12 / 38

12

Linear App Cloneweb design

Tests an AI's ability to replicate an existing UI with Tailwind CSS

Claude Sonnet 4.5

Claude Sonnet 4.5

Anthropic · Sep 2025website

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

GPT-5 Mini

GPT-5 Mini

Openai · Aug 2025website

Try this prompt

Vote

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