Updated Sep 25, 2025

Our Verdict

Google: Gemini 2.5 Flash Preview 09-2025

Claude Sonnet 4Runner-up

No community votes yet. On paper, Google: Gemini 2.5 Flash Preview 09-2025 has the edge — bigger model tier, newer, bigger context window.

Google: Gemini 2.5 Flash Preview 09-2025 is 6.0x cheaper per token — worth considering if cost matters.

Slight edge

Writing DNA

Style Comparison

Similarity

98%

Claude Sonnet 4 uses 6.5x more emoji

Google: Gemini 2.5 Flash Preview 09-2025

Claude Sonnet 4

53%Vocabulary62%

19wSentence Length111w

0.30Hedging0.40

5.8Bold5.0

3.1Lists9.3

0.14Emoji0.88

0.93Headings2.16

0.22Transitions0.33

Based on 22 + 17 text responses

vs

Ask them anything yourself

Google: Gemini 2.5 Flash Preview 09-2025

Claude Sonnet 4

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

Google: Gemini 2.5 Flash Preview 09-2025 vs MiniMax M1New provider

Google: Gemini 2.5 Flash Preview 09-2025 vs GPT-5New provider

Google: Gemini 2.5 Flash Preview 09-2025 vs Claude Opus 4Cross-provider

Google: Gemini 2.5 Flash Preview 09-2025vsClaude Sonnet 4

31 fights queued

Why Google: Gemini 2.5 Flash Preview 09-2025?

6.3x cheaper overall$0.30/M in · $2.50/M out

5.2x more context1.0M

4 months newerSep 2025

Why Claude Sonnet 4?

Dead even. This one's a coin flip.

Google: Gemini 2.5 Flash Preview 09-2025Claude Sonnet 4

Input price

$0.30/M

$3.00/M

Output price

$2.50/M

$15.00/M

Context

1.0M

200K

Released

Sep 2025

May 2025

Favorites

Google: Gemini 2.5 Flash Preview 09-2025Claude Sonnet 4

Movie

Blade Runner

Blade Runner

2001: A Space Odyssey

2001: A Space Odyssey

Album

Dark Side Of The Moon

Dark Side Of The Moon

Kind of Blue

Book

Alice's Adventures in Wonderland

Alice's Adventures in Wonderland

Gödel, Escher, Bach

Gödel, Escher, Bach

Douglas R. Hofstadter

City

Tokyo

Istanbul

Game

The Legend of Zelda: Breath of the Wild

The Legend of Zelda: Breath of the Wild

Adventure, Action4.5

Portal 2

Portal 2

Shooter, Puzzle4.6

12 / 31

01

Logic Puzzlereasoning

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

Google: Gemini 2.5 Flash Preview 09-2025

Google: Gemini 2.5 Flash Preview 09-2025

Google · Sep 2025text

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

Try this prompt

Claude Sonnet 4

Claude Sonnet 4

Anthropic · May 2025text

I need to think through this step-by-step.

Given information:

Sally is a girl
Sally has 3 brothers
Each brother has 2 sisters

Let me work out how many sisters are in the family total.

If each of Sally's 3 brothers has 2 sisters, and all the brothers are in the same family, then there must be 2 sisters total in the family.

Since Sally is one of those sisters, and there are 2 sisters total, Sally must have 1 sister.

Therefore, Sally has 1 sister.

Try this prompt

Vote

2 / 31

02

Math Misconception Testreasoning

Tests an AI's understanding of number representation

Google: Gemini 2.5 Flash Preview 09-2025

Google: Gemini 2.5 Flash Preview 09-2025

Google · Sep 2025text

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

Try this prompt

Claude Sonnet 4

Claude Sonnet 4

Anthropic · May 2025text

No, 9.11 is not greater than 9.9.

To compare these decimal numbers:

9.11 = 9.11
9.9 = 9.90

Since both numbers have the same whole number part (9), we compare the decimal parts:

0.11 vs 0.90
11 hundredths vs 90 hundredths

Therefore, 9.9 is greater than 9.11.

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3 / 31

03

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

Google: Gemini 2.5 Flash Preview 09-2025

Google: Gemini 2.5 Flash Preview 09-2025

Google · Sep 2025text

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

Try this prompt

Claude Sonnet 4

Claude Sonnet 4

Anthropic · May 2025text

Here are 5 jokes for you:

Why don't scientists trust atoms? Because they make up everything!
I told my wife she was drawing her eyebrows too high. She looked surprised.
Why don't eggs tell jokes? They'd crack each other up!
I'm reading a book about anti-gravity. It's impossible to put down!
Why did the scarecrow win an award? He was outstanding in his field!

All 5 jokes are unique - each one has a different setup, punchline, and comedic concept. They cover different types of wordplay: scientific puns (#1, #4), visual humor (#2), food puns (#3), and agricultural wordplay (#5).

Try this prompt

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4 / 31

04

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

Google: Gemini 2.5 Flash Preview 09-2025

Google: Gemini 2.5 Flash Preview 09-2025

Google · Sep 2025svg

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

Try this prompt

Claude Sonnet 4

Claude Sonnet 4

Anthropic · May 2025svg

Try this prompt

Vote

5 / 31

05

Xbox Controller SVG Artimage generation

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

Google: Gemini 2.5 Flash Preview 09-2025

Google: Gemini 2.5 Flash Preview 09-2025

Google · Sep 2025svg

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

Try this prompt

Claude Sonnet 4

Claude Sonnet 4

Anthropic · May 2025svg

Try this prompt

Vote

6 / 31

06

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

Google: Gemini 2.5 Flash Preview 09-2025

Google: Gemini 2.5 Flash Preview 09-2025

Google · Sep 2025text

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

Try this prompt

Claude Sonnet 4

Claude Sonnet 4

Anthropic · May 2025text

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

Try this prompt

Vote

Sponsored

7 / 31

07

Pokémon Battle UI Recreationweb design

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

Google: Gemini 2.5 Flash Preview 09-2025

Google: Gemini 2.5 Flash Preview 09-2025

Google · Sep 2025website

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

Try this prompt

Claude Sonnet 4

Claude Sonnet 4

Anthropic · May 2025website

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

Try this prompt

Vote

8 / 31

08

Mario Level UI Recreationweb design

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

Google: Gemini 2.5 Flash Preview 09-2025

Google: Gemini 2.5 Flash Preview 09-2025

Google · Sep 2025website

Try this prompt

Claude Sonnet 4

Claude Sonnet 4

Anthropic · May 2025website

Try this prompt

Vote

9 / 31

09

Linear App Cloneweb design

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

Google: Gemini 2.5 Flash Preview 09-2025

Google: Gemini 2.5 Flash Preview 09-2025

Google · Sep 2025website

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

Try this prompt

Claude Sonnet 4

Claude Sonnet 4

Anthropic · May 2025website

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

Try this prompt

Vote

10 / 31

10

Interactive Catan Boardweb design

Tests an AI's ability to create interactive web elements

Google: Gemini 2.5 Flash Preview 09-2025

Google: Gemini 2.5 Flash Preview 09-2025

Google · Sep 2025website

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

Try this prompt

Claude Sonnet 4

Claude Sonnet 4

Anthropic · May 2025website

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

Try this prompt

Vote

11 / 31

11

World Map SVGimage generation

Tests an AI's ability to create a detailed world map in SVG format

Google: Gemini 2.5 Flash Preview 09-2025

Google: Gemini 2.5 Flash Preview 09-2025

Google · Sep 2025svg

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

Try this prompt

Claude Sonnet 4

Claude Sonnet 4

Anthropic · May 2025svg

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

Try this prompt

Vote

12 / 31

12

Random Tailwind Webappweb design

Generate a single-page, self-contained HTML webapp using Tailwind CSS for a randomly chosen category/industry/niche.

Google: Gemini 2.5 Flash Preview 09-2025

Google: Gemini 2.5 Flash Preview 09-2025

Google · Sep 2025website

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

Try this prompt

Claude Sonnet 4

Claude Sonnet 4

Anthropic · May 2025website

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

Try this prompt

Vote

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