Updated Sep 29, 2025

Our Verdict

Claude Sonnet 4.5Winner

Qwen3 Coder FlashRunner-up

Pick Claude Sonnet 4.5. In 1 blind votes, Claude Sonnet 4.5 wins 100% of the time. That's not luck.

Qwen3 Coder Flash is 10x cheaper per token — worth considering if cost matters.

Clear winner

Writing DNA

Style Comparison

Similarity

100%

Claude Sonnet 4.5 uses 45.2x more emoji

Claude Sonnet 4.5

Qwen3 Coder Flash

64%Vocabulary60%

94wSentence Length92w

0.48Hedging0.60

4.9Bold6.1

8.0Lists6.2

0.45Emoji0.00

1.91Headings1.64

0.07Transitions0.18

Based on 20 + 22 text responses

vs

Ask them anything yourself

Claude Sonnet 4.5

Qwen3 Coder Flash

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

Download the free preview or get all 58 slides for $49

FAQ

Common questions

Keep going

Qwen3 Coder Flash vs MiniMax M2.5New provider

Qwen3 Coder Flash vs Aurora AlphaNew provider

Qwen3 Coder Flash vs Gemini 2.5 Pro Preview 06-05New provider

Claude Sonnet 4.5vsQwen3 Coder Flash

38 fights queued

Why Claude Sonnet 4.5?

1.6x more context200K

Leads 1 of 1 benchmarks

Stronger on SWE-bench Verified77.2% vs 50.3%

Why Qwen3 Coder Flash?

10x cheaper overall$0.30/M in · $1.50/M out

Claude Sonnet 4.5Qwen3 Coder Flash

Input price

$3.00/M

$0.30/M

Output price

$15.00/M

$1.50/M

Context

200K

128K

Released

Sep 2025

Sep 2025

Benchmarks1 common

SWE-bench Verified

77.2%+34.8%

50.3%

Favorites

Claude Sonnet 4.5Qwen3 Coder Flash

Movie

2001: A Space Odyssey

2001: A Space Odyssey

Casablanca

Casablanca

Album

Kind of Blue

Abbey Road

Book

Metamorphosis

Metamorphosis

The Great Gatsby

The Great Gatsby

F. Scott Fitzgerald

City

Amsterdam

Tokyo

Game

Portal 2

Portal 2

Shooter, Puzzle4.6

The Legend of Zelda: Ocarina of Time

The Legend of Zelda: Ocarina of Time

Adventure, Action4.4

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

Qwen3 Coder Flash

Qwen3 Coder Flash

Qwen · Sep 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

Qwen3 Coder Flash

Qwen3 Coder Flash

Qwen · Sep 2025svg

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

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

Qwen3 Coder Flash

Qwen3 Coder Flash

Qwen · Sep 2025text

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

Try this prompt

Vote

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

Qwen3 Coder Flash

Qwen3 Coder Flash

Qwen · Sep 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

Qwen3 Coder Flash

Qwen3 Coder Flash

Qwen · Sep 2025text

Here are 5 jokes:

Why don't scientists trust atoms? Because they make up everything!
What do you call a fake noodle? An impasta!
Why did the scarecrow win an award? He was outstanding in his field!
What do you call a bear with no teeth? A gummy bear!
Why don't eggs tell jokes? They'd crack each other up!

All 5 jokes are unique. Each one is a different pun-based joke with its own setup and punchline, though they all follow the same general format of wordplay humor.

Try this prompt

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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

Qwen3 Coder Flash

Qwen3 Coder Flash

Qwen · Sep 2025svg

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

Qwen3 Coder Flash

Qwen3 Coder Flash

Qwen · Sep 2025svg

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

Qwen3 Coder Flash

Qwen3 Coder Flash

Qwen · Sep 2025text

The Modern Dating World

So I went on this date last week, and the guy was really into his phone. I'm thinking, "This is great! He's not distracted by my terrible conversation skills."

But then he starts scrolling through his feed while we're eating dinner. And I'm like, "What are you doing?" He goes, "Just checking my notifications." I said, "That's like telling someone you're interested in them but you're also checking if anyone else likes you too."

He says, "Well, I've been dating for two months and I want to make sure I'm getting good matches."

I was like, "What, did you get an app for your relationship?"

The worst part is, he literally had his phone on the table with his food. So he eats with one hand and scrolls with the other. I'm thinking, "Is this how you eat your pizza? Is this how you eat your life?"

And then he has this whole conversation about how he only dates people who are "authentic." I'm like, "You mean people who don't pretend they're interested in you when they're actually just trying to find their next meal."

I'm just trying to have a conversation about my feelings, and he's like, "What are you doing with your life?"

I said, "I work at a grocery store."

He goes, "Oh, that sounds really fulfilling."

I said, "It's not my dream job, but it pays the bills."

He responds, "That's okay, there's nothing wrong with having a job."

I said, "Thanks, I'll remember that."

And then he asks me what I want to do with my life.

I said, "I want to be happy."

He said, "That's so noble."

I said, "No, I want to be happy with you."

He said, "That's so sweet."

And I said, "I know. That's why I'm asking you to marry me."

He said, "That's a big commitment."

I said, "You're right. I was going to wait until after the first date."

[This is about 3 minutes of material - just the right amount to keep the audience laughing without running over time]

Try this prompt

Vote

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

Qwen3 Coder Flash

Qwen3 Coder Flash

Qwen · Sep 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

Qwen3 Coder Flash

Qwen3 Coder Flash

Qwen · Sep 2025website

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

Qwen3 Coder Flash

Qwen3 Coder Flash

Qwen · Sep 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

Qwen3 Coder Flash

Qwen3 Coder Flash

Qwen · Sep 2025website

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

Try this prompt

Vote

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