Updated Oct 6, 2025

Our Verdict

Claude Opus 4Winner

GPT-5 ProRunner-up

Pick Claude Opus 4. In 1 blind votes, Claude Opus 4 wins 100% of the time. That's not luck.

Clear winner

Writing DNA

Style Comparison

Similarity

91%

Claude Opus 4 uses 444.0x more bold

GPT-5 Pro

Claude Opus 4

65%Vocabulary64%

15wSentence Length62w

0.32Hedging0.52

0.0Bold4.4

2.9Lists9.1

0.00Emoji0.11

0.00Headings1.87

0.01Transitions0.27

Based on 11 + 16 text responses

vs

Ask them anything yourself

GPT-5 Pro

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

GPT-5 Pro vs MiniMax M1New provider

Claude Opus 4 vs GPT-5Cross-provider

GPT-5 Pro vs Gemini 2.5 Pro Preview 06-05New provider

GPT-5 ProvsClaude Opus 4

25 fights queued

Why GPT-5 Pro?

2x more context400K

Leads 1 of 1 benchmarks

Stronger on SWE-bench Verified74.9% vs 72.5%

5 months newerOct 2025

Why Claude Opus 4?

1.5x cheaper overall$15.00/M in · $75.00/M out

GPT-5 ProClaude Opus 4

Input price

$15.00/M

$15.00/M

Output price

$120.00/M

$75.00/M

Context

400K

200K

Released

Oct 2025

May 2025

Benchmarks1 common

SWE-bench Verified

74.9%+3.2%

72.5%

Favorites

GPT-5 ProClaude Opus 4

Movie

—

Arrival

Arrival

Album

—

The Dark Side of the Moon

The Dark Side of the Moon

Book

—

Cien años de soledad

Cien años de soledad

Gabriel García Márquez

City

—

Istanbul

Game

—

Portal 2

Portal 2

Shooter, Puzzle4.6

12 / 25

01

Logic Puzzlereasoning

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

GPT-5 Pro

GPT-5 Pro

Openai · Oct 2025text

1

Explanation: Each brother’s two sisters are Sally plus one other girl. So there are 2 sisters total, meaning Sally has 1 sister.

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 / 25

02

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

GPT-5 Pro

GPT-5 Pro

Openai · Oct 2025text

I started labeling my leftovers “Biohazard.” Now nobody steals my lunch and the fridge is treated like a lab.
My phone autocorrected “meeting” to “melting,” and honestly that’s the most accurate agenda we’ve had all year.
I told my plants I’d water them tomorrow. They leafed me on read.
I tried to multitask by taking a nap and being productive—so I dreamed about answering emails.
The bakery hired me to write gluten-free puns. I said I knead the dough but I’ll rise to the occasion.

Unique jokes: 5

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 / 25

03

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

GPT-5 Pro

GPT-5 Pro

Openai · Oct 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 / 25

04

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

GPT-5 Pro

GPT-5 Pro

Openai · Oct 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

5 / 25

05

Mario Level UI Recreationweb design

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

GPT-5 Pro

GPT-5 Pro

Openai · Oct 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

Try this prompt

Vote

6 / 25

06

World Map SVGimage generation

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

GPT-5 Pro

GPT-5 Pro

Openai · Oct 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

Sponsored

7 / 25

07

Surprise Animal SVGimage generation

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

GPT-5 Pro

GPT-5 Pro

Openai · Oct 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

8 / 25

08

Simple 7-Ingredient Recipeconversation

Generate a unique and simple recipe with common ingredients.

GPT-5 Pro

GPT-5 Pro

Openai · Oct 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

9 / 25

09

Beginner's Longevity Planreasoning

Create a starter plan for improving long-term health.

GPT-5 Pro

GPT-5 Pro

Openai · Oct 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

Your 1-Month Health & Longevity Kickstart Plan

Week-by-Week Overview

Week 1: Foundation Building

Focus on establishing basic habits without overwhelming yourself.

Week 2: Consistency

Solidify Week 1 habits and add small challenges.

Week 3: Expansion

Introduce variety and slightly increase intensity.

Week 4: Integration

Make these habits feel like a natural part of your lifestyle.

🥗 NUTRITION: Simple, Sustainable Changes

Week 1-2: The Basics

Add, don't subtract: Include 1 serving of vegetables with lunch and dinner
Hydration first: Drink a full glass of water upon waking and before each meal
Protein priority: Ensure each meal contains a palm-sized portion of protein

Week 3-4: Level Up

Colorful plates: Aim for 3 different colored vegetables daily
Smart swaps: Replace one processed snack with whole foods (nuts, fruit, yogurt)
Meal prep Sunday: Prepare 3 healthy lunches for the week

Daily Target: 5 servings of fruits/vegetables, 8 glasses of water

🏃 MOVEMENT: Start Where You Are

Week 1-2: Build the Habit

Morning activation: 5-minute stretch routine upon waking
Daily walk: 10-minute walk after lunch or dinner
Strength basics: 2 days/week, 10 minutes of bodyweight exercises (push-ups, squats, planks)

Week 3-4: Progress Gradually

Extended walks: Increase to 20 minutes, add hills or stairs
Strength progression: 3 days/week, 15 minutes, add more reps
Fun factor: Try one new activity (dance video, bike ride, swimming)

Weekly Target: 150 minutes of movement total

😴 SLEEP: Your Recovery Superpower

Week 1-2: Sleep Hygiene Basics

Consistent schedule: Same bedtime and wake time (even weekends)
Wind-down routine: 30 minutes before bed - no screens, dim lights
Bedroom setup: Cool (65-68°F), dark, and quiet

Week 3-4: Optimize Quality

Morning sunlight: 10 minutes of natural light within 30 minutes of waking
Caffeine cutoff: No caffeine after 2 PM
Sleep tracking: Use a simple app or journal to monitor patterns

Daily Target: 7-8 hours of sleep

📋 Your Daily Checklist

Print this and check off each day:

Drank water first thing in morning
Ate vegetables with 2 meals
Moved for at least 20 minutes
Started wind-down routine by designated time
Avoided screens 30 minutes before bed

💡 Success Tips

Start small: Better to do 5 minutes consistently than 30 minutes sporadically
Track visually: Use a calendar to mark successful days
Prepare for obstacles: Have backup plans (indoor exercises, pre-cut veggies)
Celebrate wins: Acknowledge every small victory
Find accountability: Share your plan with a friend or family member

🎯 End-of-Month Goals

By Day 30, you should:

Feel more energetic throughout the day
Have established a consistent sleep schedule
Complete 20+ minutes of daily movement without struggle
Naturally reach for healthier food options
Have a sustainable routine you actually enjoy

Remember: This month is about building momentum, not perfection. Focus on progress over perfection, and thes e small changes will compound into significant long-term health improvements.

Try this prompt

Vote

10 / 25

10

Minimalist Logo SVGimage generation

Design a clean SVG logo for a fictional brand.

GPT-5 Pro

GPT-5 Pro

Openai · Oct 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

Try this prompt

Vote

11 / 25

11

Animated Digital Business Cardweb design

Create a stylish, animated digital business card.

GPT-5 Pro

GPT-5 Pro

Openai · Oct 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

Try this prompt

Vote

12 / 25

12

Tamagotchi Virtual Petweb design

Design a simple interactive virtual pet.

GPT-5 Pro

GPT-5 Pro

Openai · Oct 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

13+ 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