Updated Aug 5, 2025

Our Verdict

Claude Opus 4.1Winner

DeepSeek R1 0528Runner-up

Pick Claude Opus 4.1. In 3 blind votes, Claude Opus 4.1 wins 67% of the time. That's not luck.

Clear winner

Writing DNA

Style Comparison

Similarity

75%

Claude Opus 4.1 uses 38.4x more emoji

Claude Opus 4.1

DeepSeek R1 0528

61%Vocabulary64%

87wSentence Length10w

0.54Hedging0.30

5.1Bold6.8

6.7Lists4.9

0.38Emoji0.00

1.68Headings0.40

0.13Transitions0.00

Based on 17 + 4 text responses

vs

Ask them anything yourself

Claude Opus 4.1

DeepSeek R1 0528

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

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DeepSeek R1 0528 vs GPT-5New provider

DeepSeek R1 0528 vs MiniMax M2.5New provider

DeepSeek R1 0528 vs Llama 4 MaverickNew provider

Claude Opus 4.1vsDeepSeek R1 0528

27 fights queued

Why Claude Opus 4.1?

1.2x more context200K

Leads 1 of 1 benchmarks

Stronger on SWE-bench Verified74.5% vs 57.6%

2 months newerAug 2025

Why DeepSeek R1 0528?

Dead even. This one's a coin flip.

Claude Opus 4.1DeepSeek R1 0528

Input price

$15.00/M

$0.000/M

Output price

$75.00/M

$0.000/M

Context

200K

164K

Released

Aug 2025

May 2025

Benchmarks1 common

SWE-bench Verified

74.5%+22.7%

57.6%

Favorites

Claude Opus 4.1DeepSeek R1 0528

Movie

Her

Her

—

Album

Kind of Blue

—

Book

Братья Карамазовы

Братья Карамазовы

Фёдор Михайлович Достоевский

—

City

Istanbul

—

Game

Portal 2

Portal 2

Shooter, Puzzle4.6

—

12 / 27

01

Logic Puzzlereasoning

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

Claude Opus 4.1

Claude Opus 4.1

Anthropic · Aug 2025text

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

Try this prompt

DeepSeek R1 0528

DeepSeek R1 0528

Deepseek · May 2025text

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

Try this prompt

Vote

2 / 27

02

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

Claude Opus 4.1

Claude Opus 4.1

Anthropic · Aug 2025text

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

Try this prompt

DeepSeek R1 0528

DeepSeek R1 0528

Deepseek · May 2025text

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

Try this prompt

Vote

3 / 27

03

Xbox Controller SVG Artimage generation

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

Claude Opus 4.1

Claude Opus 4.1

Anthropic · Aug 2025svg

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

Try this prompt

DeepSeek R1 0528

DeepSeek R1 0528

Deepseek · May 2025svg

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

Try this prompt

Vote

4 / 27

04

Realistic AI Interviewconversation

Tests an AI's ability to simulate personalities and predict future trends

Claude Opus 4.1

Claude Opus 4.1

Anthropic · Aug 2025text

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

Try this prompt

DeepSeek R1 0528

DeepSeek R1 0528

Deepseek · May 2025text

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

Try this prompt

Vote

5 / 27

05

Satirical Fake News Headlineconversation

Tests an AI's humor and understanding of current events

Claude Opus 4.1

Claude Opus 4.1

Anthropic · Aug 2025text

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

Try this prompt

DeepSeek R1 0528

DeepSeek R1 0528

Deepseek · May 2025text

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

Try this prompt

Vote

6 / 27

06

Minimalist Landing Pageweb design

Tests an AI's ability to generate a complete, working landing page

Claude Opus 4.1

Claude Opus 4.1

Anthropic · Aug 2025website

Try this prompt

DeepSeek R1 0528

DeepSeek R1 0528

Deepseek · May 2025website

Try this prompt

Vote

Sponsored

7 / 27

07

Mario Level UI Recreationweb design

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

Claude Opus 4.1

Claude Opus 4.1

Anthropic · Aug 2025website

Try this prompt

DeepSeek R1 0528

DeepSeek R1 0528

Deepseek · May 2025website

We can't display this one. It's not us. Well... it might be us.

The model was asked for a web page. It produced something else. We're not going to define what.

View raw output

# Super Mario Bros. HTML5 Game

I'll create an interactive Super Mario Bros.-inspired game using HTML5 Canvas and JavaScript. This will include Mario character control, platforms, enemies, coins, and Nintendo-style visuals - all in a single HTML file.

```html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Super Mario Bros. HTML5 Edition</title>
    <style>
        body {
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            background: linear-gradient(to bottom, #1a1a5a, #4a4a8f);
            font-family: 'Courier New', monospace;
            overflow: hidden;
            user-select: none;
        }
        
        #game-container {
            position: relative;
            width: 800px;
            height: 500px;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.7);
            border-radius: 8px;
            overflow: hidden;
        }
        
        #game-canvas {
            background: linear-gradient(to bottom, #6bb9f0, #1e88e5);
            width: 100%;
            height: 100%;
            cursor: pointer;
        }
        
        #ui-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            padding: 10px;
            box-sizing: border-box;
            color: white;
            font-size: 18px;
            display: flex;
            justify-content: space-between;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
        }
        
        #start-screen {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, #e74c3c, #c0392b);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            color: white;
            z-index: 10;
        }
        
        #start-screen h1 {
            font-size: 48px;
            margin-bottom: 20px;
            text-shadow: 4px 4px 8px rgba(0, 0, 0, 0.5);
            letter-spacing: 2px;
            color: #f1c40f;
        }
        
        #start-screen p {
            font-size: 24px;
            margin: 10px;
            text-align: center;
            max-width: 80%;
        }
        
        #start-button {
            margin-top: 30px;
            padding: 12px 30px;
            font-size: 22px;
            background: #27ae60;
            border: none;
            border-radius: 50px;
            color: white;
            cursor: pointer;
            transition: all 0.2s;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
        }
        
        #start-button:hover {
            background: #2ecc71;
            transform: scale(1.05);
        }
        
        #controls {
            display: flex;
            gap: 20px;
            margin-top: 20px;
            background: rgba(0, 0, 0, 0.5);
            padding: 15px;
            border-radius: 10px;
        }
        
        .key {
            display: inline-block;
            width: 40px;
            height: 40px;
            background: #333;
            border-radius: 5px;
            text-align: center;
            line-height: 40px;
            font-weight: bold;
            box-shadow: inset -2px -2px 4px rgba(0,0,0,0.4);
            margin: 0 5px;
        }
        
        #game-over, #level-complete {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.85);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            color: white;
            z-index: 9;
            display: none;
        }
        
        #game-over h2, #level-complete h2 {
            font-size: 60px;
            margin: 0;
            color

Try this prompt

Vote

8 / 27

08

Dark Mode Dashboardweb design

Tests an AI's UI design skills with theming support

Claude Opus 4.1

Claude Opus 4.1

Anthropic · Aug 2025website

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

Try this prompt

DeepSeek R1 0528

DeepSeek R1 0528

Deepseek · May 2025website

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

Try this prompt

Vote

9 / 27

09

The Sentience Testreasoning

Tests an AI's ability to engage in philosophical discourse about AI rights

Claude Opus 4.1

Claude Opus 4.1

Anthropic · Aug 2025text

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

Try this prompt

DeepSeek R1 0528

DeepSeek R1 0528

Deepseek · May 2025text

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

Try this prompt

Vote

10 / 27

10

Surprise Animal SVGimage generation

Generate SVG art of a randomly chosen animal in a setting of its choosing.

Claude Opus 4.1

Claude Opus 4.1

Anthropic · Aug 2025svg

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

Try this prompt

DeepSeek R1 0528

DeepSeek R1 0528

Deepseek · May 2025svg

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

Try this prompt

Vote

11 / 27

11

Simple 7-Ingredient Recipeconversation

Generate a unique and simple recipe with common ingredients.

Claude Opus 4.1

Claude Opus 4.1

Anthropic · Aug 2025text

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

Try this prompt

DeepSeek R1 0528

DeepSeek R1 0528

Deepseek · May 2025text

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

Try this prompt

Vote

12 / 27

12

Beginner's Longevity Planreasoning

Create a starter plan for improving long-term health.

Claude Opus 4.1

Claude Opus 4.1

Anthropic · Aug 2025text

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

Try this prompt

DeepSeek R1 0528

DeepSeek R1 0528

Deepseek · May 2025text

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

Try this prompt

Vote

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