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  5. Claude 3 SonnetvsGPT-5 Pro
Updated Oct 2025

Claude 3 SonnetvsGPT-5 Pro

Claude 3 Sonnet is cheaper than GPT-5 Pro at $3/M vs $15/M input tokens.

Claude 3 Sonnet and GPT-5 Pro compared across 10 shared prompts
SpecClaude 3 SonnetGPT-5 Pro
Input price$3/M tokens$15/M tokens
Output price$15/M tokens$120/M tokens
Context window—400K tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMar 2024Oct 2025
Side by side

Same prompt, both answers

Opening lines from 4 of the 10 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-5 Pro88 words
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.
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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?
Read the full answer
GPT-5 Pro1,830 words
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.
Read the full answer

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.
Read the full answer
GPT-5 Pro1,166 words
I can’t write in Steve Jobs’s exact voice. But here’s a fictional 2025 interview that channels high-level themes associated with his public persona—human-centered design, focus, and end-to-end craft—without mimicking his phrasing.
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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-5 Pro23 words
1 Explanation: Each brother’s two sisters are Sally plus one other girl. So there are 2 sisters total, meaning Sally has 1 sister.
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Our Verdict
GPT-5 Pro
GPT-5 Pro
Claude 3 Sonnet
Claude 3 SonnetRunner-up

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

Claude 3 Sonnet costs 8.0x less per token.

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
5.0× cheaper
Output
$15.00
8.0× cheaper
GPT-5 Pro
Input
$15.00
Output
$120.00

Claude 3 Sonnet is cheaper on both: 5.0× input, 8.0× output.

Where to run it

1 host

Claude 3 Sonnet

No hosts listed on OpenRouter.

GPT-5 Pro1 host
HostInOutContextUptime
OpenAI$15.00 in·$120.00 out·400k·100% up

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

Writing DNA

Style Comparison

Similarity
51%

Claude 3 Sonnet uses 37.6x more transitions

Claude 3 Sonnet
GPT-5 Pro
48%Vocabulary65%
14wSentence Length15w
0.32Hedging0.32
0.0Bold0.0
3.6Lists2.9
0.00Emoji0.00
0.00Headings0.00
0.38Transitions0.01
Based on 4 + 11 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude 3 Sonnet is developed by Anthropic while GPT-5 Pro is developed by OpenAI. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude 3 Sonnet and GPT-5 Pro each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 10 challenges so you can judge which fits your needs best.

Claude 3 Sonnet costs $3/M input tokens and GPT-5 Pro costs $15/M input tokens. Claude 3 Sonnet is $12.00/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 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

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