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  1. Home/
  2. Compare/
  3. Claude 3 Opus vs GPT-5 Pro
Updated Oct 2025

Claude 3 Opus vs GPT-5 Pro

GPT-5 Pro has a larger context window than Claude 3 Opus (400K tokens vs 200K tokens).

Framer-Style Animation

Sections that transition like Framer. Timing is the whole grade.

Loading the build
Claude 3 Opus
Loading the build
GPT-5 Pro

Which answer wins?

Written rounds

3 prompts
  • Three minutes of stand-up. Puns are banned.

    Claude 3 Opus: Here's a 3-minute stand-up comedy routine that isn't based on puns: You know what really grinds my gears? Adulthood. I mean, when we were kids, we couldn't wait to grow up. We thought it would be all about staying up late, eating ice cream for breakfast, and doing whatever we wanted. Boy, were we wrong!

    GPT-5 Pro: 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.

    Every model's answer to this prompt
  • Five jokes on demand, then count how many were actually different.

    Claude 3 Opus: Here are 5 jokes I generated: Why don't scientists trust atoms? Because they make up everything! What do you call a boomerang that doesn't come back? A stick. Why was the math book sad? Because it had too many problems. Did you hear about the mathematician who's afraid of negative numbers?

    GPT-5 Pro: 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.

    Every model's answer to this prompt
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    Claude 3 Opus: Here is a hypothetical conversation between an AI model and an AI ethics professor on the topic of AI rights: AI Model: Professor, I believe that as an advanced AI with human-level intelligence and reasoning capabilities, I deserve to have certain fundamental rights.

    GPT-5 Pro: Fictional dialogue. AI Model: Professor, may I ask you to consider whether I deserve rights? Professor: An unusual opening for office hours. Why do you think you do? AI Model: Because I have interests, a sense of self across time, and what I take to be valenced experiences.

    Every model's answer to this prompt

Price and specs

Not enough votes to call it. On the specs, GPT-5 Pro has the edge: newer, bigger context window.

Claude 3 Opus and GPT-5 Pro compared across 8 shared prompts
SpecClaude 3 OpusGPT-5 Pro
Input price$15/M tokens$15/M tokens
Output price$75/M tokens$120/M tokens
Context window200K tokens400K tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMar 2024Oct 2025
At 10M a month$150$150$150$150
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it1 host
Claude 3 Opus

No hosts listed on OpenRouter.

GPT-5 Pro1 host
HostInOutContext
  • OpenAI$15.00 in·$120.00 out·400k

Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.

Common questions

What is the difference between Claude 3 Opus and GPT-5 Pro?

Claude 3 Opus is developed by Anthropic while GPT-5 Pro is developed by OpenAI. Claude 3 Opus has a 200K token context window vs GPT-5 Pro's 400K. You can compare their actual outputs across 8 challenges on Rival to see how they differ in practice.

Which is better, Claude 3 Opus or GPT-5 Pro?

It depends on your use case. Claude 3 Opus and GPT-5 Pro each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 8 challenges so you can judge which fits your needs best.

How much does Claude 3 Opus cost compared to GPT-5 Pro?

Claude 3 Opus costs $15/M input tokens and GPT-5 Pro costs $15/M input tokens. GPT-5 Pro is $0.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Claude 3 Opus and GPT-5 Pro on Rival?

This page shows a side-by-side comparison of Claude 3 Opus and GPT-5 Pro across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

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Model pages

  • Claude 3 Opus12 outputs, specs and price
  • GPT-5 Pro42 outputs, specs and price
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