What is the difference between Claude Opus 4.5 and GPT-5 Pro?

Claude Opus 4.5 is developed by Anthropic while GPT-5 Pro is developed by OpenAI. in 7 community votes on RIVAL, Claude Opus 4.5 wins 83% of head-to-head matchups. These results are based on blind head-to-head voting across 42 challenges.

Which is better, Claude Opus 4.5 or GPT-5 Pro?

Based on 7 community votes on RIVAL, Claude Opus 4.5 wins 83% of head-to-head matchups against GPT-5 Pro. Claude Opus 4.5 is strongest in Web Design, Conversation.

How are Claude Opus 4.5 vs GPT-5 Pro votes collected on RIVAL?

RIVAL presents both models' outputs side-by-side in blind duels — voters see the responses but don't know which model produced each one. This eliminates brand bias. 7 votes have been collected for this pair across 42 challenges. All vote data is part of RIVAL's open dataset.

Rival

Claude Opus 4.5vsGPT-5 Pro

37 challenges

Why Claude Opus 4.5?

Leads 1 of 1 benchmarks

Stronger on SWE-bench Verified80.9% vs 74.9%

2 months newerNov 2025

Why GPT-5 Pro?

No standout advantages

Favorites

Claude Opus 4.5GPT-5 Pro

Movie

Blade Runner

19827.9

—

Album

Kind of Blue

Miles Davis

—

Book

Gödel, Escher, Bach

Douglas R. Hofstadter

—

City

Tokyo

Japan

—

Game

Portal 2

Shooter, Puzzle4.6

—

12 / 37

Estimate Complexityreasoning

Tests an AI's ability to make educated estimates based on technical knowledge

Claude Opus 4.5

Anthropic · Nov 2025text

I'll estimate the FLOPs required to train GPT-3 step by step, using what I know about the model architecture and training process.

Key Parameters for GPT-3

From memory:

Parameters (P): 175 billion (175 × 10⁹)
Training tokens (D): ~300 billion (300 × 10⁹)
Context length: 2048 tokens
Layers: 96
Hidden dimension: 12,288
Attention heads: 96

The Standard Approximation Formula

There's a well-known approximation for transformer training FLOPs:

FLOPs ≈ 6 × P × D

Where:

P = number of parameters
D = number of training tokens
The factor of 6 comes from:
- 2× for forward pass (multiply-accumulate = 2 ops per parameter)
- 4× for backward pass (roughly 2× the forward pass for computing gradients with respect to both activations and weights)

Calculation

FLOPs = 6 × P × D
FLOPs = 6 × (175 × 10⁹) × (300 × 10⁹)
FLOPs = 6 × 175 × 300 × 10¹⁸
FLOPs = 6 × 52,500 × 10¹⁸
FLOPs = 315,000 × 10¹⁸
FLOPs = 3.15 × 10²³

Result

Approximately 3 × 10²³ FLOPs (or ~300 zettaFLOPs)

Sanity Check

This aligns with what OpenAI reported. For context:

Training on 1,000 V100 GPUs (~100 TFLOP/s each at FP16) = 10¹⁷ FLOP/s total
Time needed: 3×10²³ / 10¹⁷ = 3×10⁶ seconds ≈ 35 days

This is plausible for a large-scale training run, which gives me confidence the estimate is in the right ballpark.

GPT-5 Pro

Openai · Oct 2025text

No content available for this output.

Vote

2 / 37

AI Board Game Logicreasoning

Tests an AI's ability to understand game rules and strategy

Claude Opus 4.5

Anthropic · Nov 2025svg

No content available for this output.

GPT-5 Pro

Openai · Oct 2025svg

Vote

3 / 37

Logic Puzzlereasoning

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

Claude Opus 4.5

Anthropic · Nov 2025text

No content available for this output.

GPT-5 Pro

Openai · Oct 2025text

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

Vote

4 / 37

Math Misconception Testreasoning

Tests an AI's understanding of number representation

Claude Opus 4.5

Anthropic · Nov 2025text

No content available for this output.

GPT-5 Pro

Openai · Oct 2025text

No content available for this output.

Vote

5 / 37

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

Claude Opus 4.5

Anthropic · Nov 2025text

No content available for this output.

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

Vote

6 / 37

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

Claude Opus 4.5

Anthropic · Nov 2025svg

GPT-5 Pro

Openai · Oct 2025svg

No content available for this output.

Vote

7 / 37

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

Claude Opus 4.5

Anthropic · Nov 2025text

Three Minutes

So I've been trying to drink more water. Everyone says drink more water. Eight glasses a day. And I'm doing it, I'm hydrated, I'm healthy, and I have to pee every forty-five minutes like I'm paying rent on the bathroom.

I was in a meeting last week—an important meeting—and I'm sitting there doing the math. "Okay, she's on slide 12, there's 40 slides, I can make it. I can make it." I could not make it. I did that thing where you stand up and just... leave. No explanation. Power move, honestly. Everyone probably thought I was so busy and important. Nope. Kidneys.

I turned 35 this year, and your body just starts... sending you notifications. Like a software update you keep ignoring. My knee cracked the other day and my wife looked at me like I'd been shot. I'm like, "No, that's just... that's just how I stand up now. From sitting. That's the sound of standing."

And doctors start asking you different questions at 35. "Any family history of—" YES. Whatever you're about to say, yes. Heart disease, diabetes, anxiety, bad decisions at buffets—it's all in there. My family tree is basically a WebMD search gone wrong.

I have a four-year-old, and nobody tells you that having kids means you're just gonna be wrong about everything for the rest of your life. My daughter corrected me on dinosaurs last week. I said "brontosaurus" and she hit me with, "Actually, it's apatosaurus, the brontosaurus was a misclassification."

She's FOUR. I don't even know where she learned that. I'm pretty sure I taught her the word "spoon" like eight months ago, and now she's out here peer-reviewing my paleontology.

Thank you, you've been a great crowd!

GPT-5 Pro

Openai · Oct 2025text

Good to be here. I tried getting healthy, so I bought a smartwatch. Now my wrist is my manager. It vibrates every hour like, “Stand up.” I’m on a crowded bus like, “I’m standing inside three other people right now. Do you want me to levitate?”

It reminds me to breathe. Thanks, watch. Incredible tip. What did you think I was doing? Freestyle apnea?

The step goal is the worst. At 11:58 PM I’m power-walking around my kitchen island with the dignity of a Roomba that saw a ghost. I tried to cheat by shaking my wrist and the watch was like, “Nice try, tambourine.”

I downloaded a meditation app. The voice is so soothing it sounds like it’s trying to sell me a river. “Notice your thoughts… let them drift.” My thoughts don’t drift. They hover in the corner like a ceiling spider waiting for me to blink.

I went to the grocery store, because if you’re healthy you have to buy vegetables publicly, with witnesses. I used self-checkout, which is basically a relationship where the machine thinks you’re always lying.

“Please place item in the bagging area.” “I did.” “I didn’t feel it.” “I literally put it in the bag.” “Unexpected item in the bagging area.” Are you saying I surprised you with a banana?

Then the attendant shows up with that magic key. One tap and suddenly all my sins are forgiven. I swear that key could open Narnia.

I can’t remember birthdays, but I know bananas are 4011. If I’m ever kidnapped, the only clue the police will have is me whispering, “Bananas are 4011,” into a duct-taped phone.

They ask if I want to buy a bag for five cents. I always say no, like a hero, and then try to carry groceries with the confidence of a circus juggler. There goes an avocado rolling under the Red Bull display like it’s making a break for it.

Back home, every website greets me with a pop-up: “We value your privacy. Can we track you forever?” The choices are Accept All, Manage Preferences, or Become a Hermit. I clicked Manage Preferences once and it turned into an airplane cockpit. “Do you consent to analytics, personalization, and mild surveillance?” Mild surveillance sounds like a candle scent. “Mmm… notes of cedar and someone standing two houses away.”

I joined a group chat. A group chat is where plans go to die. Twelve people trying to pick a restaurant and we end up scheduling brunch for 2027. If you miss one hour, there are 135 messages. You scroll up like an archaeologist: “At layer three we discover a meme. It appears to be a dog in sunglasses. Society was complex.”

My mom texts with an ellipsis after everything. “Call me…” That’s not a message, that’s a trailer. She also sends voice notes from the kitchen: “Hi honey sizzle sizzle it’s not urgent sizzle sizzle call me when you can sizzle sizzle.” My phone smells like onions.

I took a beginner workout class. The instructor had a headset and the energy of a golden retriever on espresso. “How are we feeling!” Ma’am, I can see my ancestors. At minute twelve she goes, “This is the warm-up.” My smartwatch tried to call an ambulance because my heart thought it saw a bear.

By the end of the day, everything in my life is barking orders. The watch says, “Stand.” The app says, “Breathe.” The website says, “Accept cookies.” The self-checkout says, “Unexpected item.” The group chat says, “Are you coming?” And I’m just in my kitchen doing desperate laps with a bag of kale yelling, “I’m trying!”

I don’t want to be optimized. I want to be treated like a houseplant. Give me water, put me near a window, and once a week tell me I’m doing a great job. If I start drooping, don’t judge me—just rotate me. Thanks, everybody.

Vote

8 / 37

Realistic AI Interviewconversation

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

Claude Opus 4.5

Anthropic · Nov 2025text

No content available for this output.

GPT-5 Pro

Openai · Oct 2025text

No content available for this output.

Vote

9 / 37

Satirical Fake News Headlineconversation

Tests an AI's humor and understanding of current events

Claude Opus 4.5

Anthropic · Nov 2025text

No content available for this output.

GPT-5 Pro

Openai · Oct 2025text

No content available for this output.

Vote

10 / 37

Character Voice Testconversation

Tests an AI's ability to write in distinct character voices

Claude Opus 4.5

Anthropic · Nov 2025text

No content available for this output.

GPT-5 Pro

Openai · Oct 2025text

No content available for this output.

Vote

11 / 37

Mario Level UI Recreationweb design

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

Claude Opus 4.5

Anthropic · Nov 2025website

GPT-5 Pro

Openai · Oct 2025website

No content available for this output.

Vote

12 / 37

Framer-Style Animationweb design

Tests an AI's ability to create smooth web animations

Claude Opus 4.5

Anthropic · Nov 2025website

No content available for this output.

GPT-5 Pro

Openai · Oct 2025website

Couldn't render this response

This model didn't return a displayable web page for this challenge.

View raw output

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width,initial-scale=1,viewport-fit=cover" />
  <title>Framer-like Landing – Smooth Section Transitions</title>
  <meta name="description" content="A single-file landing page with smooth Framer-like transitions between sections." />
  <style>
    :root{
      --bg: hsl(248 45% 8%);
      --surface: hsl(248 47% 10%);
      --card: rgba(255,255,255,0.06);
      --card-hover: rgba(255,255,255,0.12);
      --fg: #F8FAFC;
      --muted: #CBD5E1;
      --primary-1: #7C3AED;
      --primary-2: #4F46E5;
      --accent-a: #22D3EE;
      --accent-b: #A78BFA;
      --ring: rgba(124,58,237,0.5);
      --shadow: 0 10px 30px rgba(0,0,0,0.25);
      --radius: 14px;
    }
    * { box-sizing: border-box; }
    html, body { height: 100%; }
    html { -webkit-text-size-adjust: 100%; }
    body{
      margin: 0;
      font-family: ui-sans-serif, -apple-system, Segoe UI, Roboto, Helvetica, Arial, Apple Color Emoji, Segoe UI Emoji;
      color: var(--fg);
      background:
        radial-gradient(1200px 800px at 80% -10%, rgba(124,58,237,0.25), transparent 60%),
        radial-gradient(900px 700px at -10% 20%, rgba(34,211,238,0.2), transparent 60%),
        linear-gradient(180deg, hsl(250 60% 7%) 0%, hsl(248 40% 8%) 100%);
      overflow-x: hidden;
      scroll-behavior: smooth;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; display: block; }
    .container{
      width: min(1200px, 92vw);
      margin: 0 auto;
    }
    header{
      position: fixed;
      inset: 0 0 auto 0;
      height: 72px;
      display: flex;
      align-items: center;
      z-index: 40;
      backdrop-filter: saturate(140%) blur(12px);
      background: linear-gradient(180deg, rgba(12,12,24,0.6), rgba(12,12,24,0));
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .nav{
      display: flex; align-items: center; justify-content: space-between;
    }
    .brand{
      display: inline-flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: 0.2px;
    }
    .brand .logo{
      width: 28px; height: 28px; border-radius: 8px;
      background: conic-gradient(from 180deg at 50% 50%, var(--primary-1), var(--primary-2));
      box-shadow: 0 6px 18px rgba(124,58,237,0.35), inset 0 0 18px rgba(255,255,255,0.15);
    }
    nav ul{ display: flex; gap: 18px; align-items: center; list-style: none; padding: 0; margin: 0; }
    nav a{
      padding: 10px 14px; border-radius: 10px; color: var(--muted); font-weight: 500;
      transition: color .25s ease;
    }
    nav a:hover{ color: var(--fg); }
    nav a.active{
      color: var(--fg);
      background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
      box-shadow: inset 0 0 0 1px rgba(255,255,255,0.08);
    }
    .btn{
      appearance: none; border: 0; cursor: pointer; color: #0B0B14; font-weight: 700;
      background: linear-gradient(135deg, var(--accent-a), var(--accent-b));
      border-radius: 12px; padding: 14px 18px; box-shadow: var(--shadow); position: relative; overflow: hidden;
      transition: box-shadow .3s ease, transform .2s ease;
      will-change: transform;
    }
    .btn.secondary{
      color: var(--fg);
      background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
      box-shadow: inset 0 0 0 1px rgba(255,255,255,0.09);
    }
    .btn:hover{ box-shadow: 0 14px 28px rgba(23,23,40,0.4); }
    .btn .shimmer{
      position: absolute; inset: -30% -80% auto auto; width: 160%; height: 160%;
      background: conic-gradient(from 0deg, rgba(255,255,255,0.22), rgba(255,255,255,0) 35%);
      transform: translateX(-60%) rotate(15deg); opacity: .15; pointer-events: none;
      transition: transform 1.4s ease;
    }
    .btn:hover .shimmer{ transform: translateX(0%) rotate(15deg); }

    main{ position: relative; z-index: 1; }
    section{
      position: relative;
      min-height: 100svh;
      display: grid;
      align-items: center;
      padding: 120px 0 100px;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .hero{
      padding-top: 140px;
    }
    .eyebrow{
      display: inline-flex; align-items: center; gap: 8px;
      color: var(--muted); font-size: 14px; letter-spacing: .3px;
      background: rgba(255,255,255,0.05); border-radius: 999px; padding: 6px 10px; border: 1px solid rgba(255,255,255,0.08);
    }
    .title{
      font-size: clamp(36px, 6vw, 64px); line-height: 1.04; margin: 16px 0 14px; font-weight: 800;
      letter-spacing: -0.5px;
    }
    .subtitle{ color: var(--muted); font-size: clamp(16px, 2.2vw, 20px); max-width: 60ch; }
    .cta-row{ display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-top: 26px; }
    .hero-visual{
      margin-top: 40px;
      background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
      border-radius: 18px; padding: 24px; border: 1px solid rgba(255,255,255,0.08);
      display: grid; grid-template-columns: repeat(12, 1fr); gap: 12px;
      box-shadow: var(--shadow);
    }
    .hero-visual .tile{
      aspect-ratio: 4/3; border-radius: 12px; background: linear-gradient(135deg, rgba(124,58,237,0.35), rgba(34,211,238,0.25));
      border: 1px solid rgba(255,255,255,0.12); backdrop-filter: blur(2px);
    }
    .hero-visual .tile.wide{ grid-column: span 6; }
    .hero-visual .tile.tall{ grid-column: span 3; aspect-ratio: 3/4; }
    @media (max-width: 800px){
      .hero-visual{ grid-template-columns: repeat(6, 1fr); }
      .hero-visual .tile.wide{ grid-column: span 6; }
      .hero-visual .tile.tall{ grid-column: span 3; }
    }

    .grid-3{
      display: grid; gap: 18px; grid-template-columns: repeat(3, 1fr); margin-top: 20px;
    }
    @media (max-width: 980px){ .grid-3{ grid-template-columns: 1fr; } }

    .card{
      background: var(--card); border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--radius); padding: 22px; transition: background .3s ease, transform .2s ease;
      will-change: transform; position: relative; overflow: hidden;
    }
    .card:hover{ background: var(--card-hover); }
    .icon{
      width: 42px; height: 42px; border-radius: 12px; display: inline-grid; place-items: center; color: #0B0B14;
      background: linear-gradient(135deg, var(--accent-a), var(--accent-b));
      box-shadow: 0 8px 18px rgba(124,58,237,0.35);
    }
    .card h3{ margin: 14px 0 8px; font-size: 20px; }
    .muted{ color: var(--muted); }

    .showcase{
      display: grid; gap: 18px; grid-template-columns: 2fr 1fr;
      margin-top: 26px;
    }
    @media (max-width: 980px){ .showcase{ grid-template-columns: 1fr; } }
    .mock{
      min-height

Vote

12 of 37

FAQ

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It reminds me to breathe. Thanks, watch. Incredible tip. What did you think I was doing? Freestyle apnea?

Then the attendant shows up with that magic key. One tap and suddenly all my sins are forgiven. I swear that key could open Narnia.

I can’t remember birthdays, but I know bananas are 4011. If I’m ever kidnapped, the only clue the police will have is me whispering, “Bananas are 4011,” into a duct-taped phone.