Updated Dec 17, 2025

Our Verdict

Gemini 3 Flash Preview

Claude Opus 4

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Gemini 3 Flash Preview is 25x cheaper per token — worth considering if cost matters.

Too close to call

Writing DNA

Style Comparison

Similarity

99%

Claude Opus 4 uses 11.2x more emoji

Gemini 3 Flash Preview

Claude Opus 4

55%Vocabulary64%

18wSentence Length62w

0.42Hedging0.52

7.1Bold4.4

4.5Lists9.1

0.00Emoji0.11

0.84Headings1.87

0.07Transitions0.27

Based on 24 + 16 text responses

vs

Ask them anything yourself

Gemini 3 Flash Preview

Claude Opus 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

Claude Opus 4 vs GPT-5New provider

Gemini 3 Flash Preview vs MiniMax M1New provider

Claude Opus 4 vs Llama 4 MaverickNew provider

Gemini 3 Flash PreviewvsClaude Opus 4

35 fights queued

Why Gemini 3 Flash Preview?

25.5x cheaper overall$0.50/M in · $3.00/M out

5.2x more context1.0M

Leads 1 of 1 benchmarks

Stronger on SWE-bench Verified78.0% vs 72.5%

7 months newerDec 2025

Why Claude Opus 4?

Dead even. This one's a coin flip.

Gemini 3 Flash PreviewClaude Opus 4

Input price

$0.50/M

$15.00/M

Output price

$3.00/M

$75.00/M

Context

1.0M

200K

Released

Dec 2025

May 2025

Benchmarks1 common

SWE-bench Verified

78.0%+7.1%

72.5%

Favorites

Gemini 3 Flash PreviewClaude Opus 4

Movie

Interstellar

Interstellar

Arrival

Arrival

Album

Kind of Blue

The Dark Side of the Moon

The Dark Side of the Moon

Book

La biblioteca de babel

La biblioteca de babel

Jorge Luis Borges

Cien años de soledad

Cien años de soledad

Gabriel García Márquez

City

Kyoto

Istanbul

Game

Outer Wilds

Outer Wilds

Indie, Adventure4.4

Portal 2

Portal 2

Shooter, Puzzle4.6

12 / 35

01

Logic Puzzlereasoning

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

Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025text

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

Try this prompt

Claude Opus 4

Claude Opus 4

Anthropic · May 2025text

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

Given information:

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

Since Sally is one of the sisters that each brother has, and each brother has 2 sisters total, that means th ere must be exactly 2 sisters in the family.

The 2 sisters are:

Sally
One other sister

Therefore, Sally has 1 sister.

Try this prompt

Vote

2 / 35

02

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025text

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

Try this prompt

Claude Opus 4

Claude Opus 4

Anthropic · May 2025text

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

Try this prompt

Vote

3 / 35

03

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025svg

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

Try this prompt

Claude Opus 4

Claude Opus 4

Anthropic · May 2025svg

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

Try this prompt

Vote

4 / 35

04

Xbox Controller SVG Artimage generation

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

Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025svg

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

Try this prompt

Claude Opus 4

Claude Opus 4

Anthropic · May 2025svg

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

Try this prompt

Vote

5 / 35

05

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025text

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

Try this prompt

Claude Opus 4

Claude Opus 4

Anthropic · May 2025text

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

Try this prompt

Vote

6 / 35

06

Pokémon Battle UI Recreationweb design

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

Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025website

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

Try this prompt

Claude Opus 4

Claude Opus 4

Anthropic · May 2025website

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

Try this prompt

Vote

Sponsored

7 / 35

07

Three.js 3D Gameweb design

Create a 3D building and driving game in a single self-contained HTML file using Three.js. Tests an AI's ability to combine 3D graphics, game logic, and UI interactions on the web.

Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025html

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

Try this prompt

Claude Opus 4

Claude Opus 4

Anthropic · May 2025html

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

Try this prompt

Vote

8 / 35

08

Mario Level UI Recreationweb design

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

Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025website

Try this prompt

Claude Opus 4

Claude Opus 4

Anthropic · May 2025website

Try this prompt

Vote

9 / 35

09

Linear App Cloneweb design

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

Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025website

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

Try this prompt

Claude Opus 4

Claude Opus 4

Anthropic · May 2025website

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

Try this prompt

Vote

10 / 35

10

Interactive Catan Boardweb design

Tests an AI's ability to create interactive web elements

Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025website

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

Try this prompt

Claude Opus 4

Claude Opus 4

Anthropic · May 2025website

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

Try this prompt

Vote

11 / 35

11

World Map SVGimage generation

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

Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025svg

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

Try this prompt

Claude Opus 4

Claude Opus 4

Anthropic · May 2025svg

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

Try this prompt

Vote

12 / 35

12

Random Tailwind Webappweb design

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

Gemini 3 Flash Preview

Gemini 3 Flash Preview

Google · Dec 2025website

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

Try this prompt

Claude Opus 4

Claude Opus 4

Anthropic · May 2025website

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

Try this prompt

Vote

This matchup has more rounds

23+ more head-to-head results. Free. Not a trick.

Free account. No card required. By continuing, you agree to Rival's Terms and Privacy Policy