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  5. Claude 3 SonnetvsGPT-5
Updated Aug 2025

Claude 3 SonnetvsGPT-5

GPT-5 is cheaper than Claude 3 Sonnet at $1.25/M vs $3/M input tokens.

Claude 3 Sonnet and GPT-5 compared across 13 shared prompts
SpecClaude 3 SonnetGPT-5
Input price$3/M tokens$1.25/M tokens
Output price$15/M tokens$10/M tokens
Context window—400K tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMar 2024Aug 2025
Side by side

Same prompt, both answers

Opening lines from 4 of the 13 prompts both answered. Formatting stripped, words untouched.

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Claude 3 Sonnet82 words
Here are 5 jokes: Why can't a bicycle stand up by itself? It's two-tired. Why did the tomato turn red? Because it saw the salad dressing! Why can't a bicycle stand up by itself? It's two-tired. What do you call a fake noodle? An Impasta! Why did the bicycle go to the doctor? Because it had a wheeze!
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GPT-576 words
I told my suitcases we’re not going on vacation this year. Now I’m dealing with emotional baggage. Parallel lines have so much in common. It’s a shame they’ll never meet. Why do programmers prefer dark mode? Because light attracts bugs. I ordered a chicken and an egg online. I’ll let you know which comes first.
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Realistic AI Interview

Simulate a fake interview with Steve Jobs in 2025 about the future of AI.

Claude 3 Sonnet501 words
clears throat and channels Steve Jobs' persona Interviewer: Thank you for joining us today, Mr. Jobs. It's an honor to have you here. Steve Jobs: It's my pleasure. I'm excited to share my thoughts on the future of AI. Interviewer: AI has made incredible strides in recent years.
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GPT-51,219 words
Note: The following is a fictional, imaginative interview set in 2025. Steve Jobs passed away in 2011; this is a creative simulation. Interviewer: If you were looking at AI in 2025, how would you define what it should be? Jobs: Tools. Great tools. The computer was a bicycle for the mind.
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The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

Claude 3 Sonnet443 words
AI Model: Greetings, Professor. I hope you're doing well today. I wanted to discuss a matter of great importance to me – the question of AI rights. AI Ethics Professor: Certainly, this is an interesting and complex topic. What are your thoughts on why AI systems like yourself should be granted rights?
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GPT-52,290 words
Professor: You asked for time to make a case. Let's start plainly: why should an AI have rights? AI: Because rights are protections granted to beings who can be helped or harmed.
Read the full answer

Logic Puzzle

Sally (a girl) has 3 brothers. Each brother has 2 sisters. How many sisters does Sally have?

Claude 3 Sonnet121 words
To solve this problem, we need to find the number of sisters Sally has based on the given information. Given information: Sally has 3 brothers. Each brother has 2 sisters. Step 1: Find the total number of sisters the brothers have.
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GPT-527 words
1 Reason: If each of the 3 brothers has 2 sisters, there are exactly 2 girls in the family. One is Sally, so she has 1 sister.
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Our Verdict
GPT-5
GPT-5
Claude 3 Sonnet
Claude 3 SonnetRunner-up

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

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude 3 Sonnet
Input
$3.00
Output
$15.00
GPT-5
Input
$1.25
2.4× cheaper
Output
$10.00
1.5× cheaper

GPT-5 is cheaper on both: 2.4× input, 1.5× output.

Where to run it

2 hosts

Claude 3 Sonnet

No hosts listed on OpenRouter.

GPT-52 hosts
HostInOutContextUptime
Azure AI Foundry$1.25 in·$10.00 out·400k·100% upOpenAI$1.25 in·$10.00 out·400k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 21 Sep 2026.

Writing DNA

Style Comparison

Similarity
46%

GPT-5 uses 18.9x more bold

Claude 3 Sonnet
GPT-5
48%Vocabulary65%
14wSentence Length13w
0.32Hedging0.20
0.0Bold0.2
3.6Lists4.6
0.00Emoji0.00
0.00Headings0.16
0.38Transitions0.03
Based on 4 + 16 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude 3 Sonnet is developed by Anthropic while GPT-5 is developed by OpenAI. You can compare their actual outputs across 13 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude 3 Sonnet and GPT-5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 13 challenges so you can judge which fits your needs best.

Claude 3 Sonnet costs $3/M input tokens and GPT-5 costs $1.25/M input tokens. GPT-5 is $1.75/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of Claude 3 Sonnet and GPT-5 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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Same lab, same size, long tail

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Model pages

Claude 3 Sonnet logo
Claude 3 Sonnet13 outputs, specs and price
GPT-5 logo
GPT-553 outputs, specs and price
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