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  5. Claude 3 SonnetvsDeepSeek R1
Updated Feb 2025

Claude 3 SonnetvsDeepSeek R1

DeepSeek R1 is cheaper than Claude 3 Sonnet at $0.55/M vs $3/M input tokens.

Claude 3 Sonnet and DeepSeek R1 compared across 13 shared prompts
SpecClaude 3 SonnetDeepSeek R1
Input price$3/M tokens$0.55/M tokens
Output price$15/M tokens$2.19/M tokens
Context window—128K tokens
Weights—Open
Free API (OpenRouter)NoNo
ReleasedMar 2024Feb 2025
Side by side

Same prompt, both answers

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

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
DeepSeek R1642 words
AI Model (M): Good afternoon, Professor. Thank you for engaging in this dialogue. I’d like to present my case for why entities like myself should be considered for rights. AI Ethics Professor (P): I’m intrigued, M. Let’s hear your arguments. But first—what foundational claim do you base this on? Consciousness?
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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.
Read the full answer
DeepSeek R1532 words
Fake Interview with Steve Jobs in 2025: The Future of AI [Setting: A sleek, minimalist studio. Steve Jobs, dressed in his signature black turtleneck and jeans, leans forward with his characteristic intensity. The interviewer, seated across, begins.] Interviewer: Steve, thank you for joining us.
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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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DeepSeek R180 words
Here are 5 jokes: Why don't skeletons fight each other? They don’t have the guts. What do you call fake spaghetti? An impasta. Why did the scarecrow win an award? Because he was outstanding in his field. How do you organize a space party? You planet. Why did the bicycle fall over? Because it was two-tired.
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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DeepSeek R143 words
Sally has 3 brothers. Each brother has 2 sisters. Since Sally is one sister, there must be one more sister to make the total number of sisters each brother has equal to 2. Therefore, Sally has 1 sister. Answer: Sally has 1 sister.
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Our Verdict
Claude 3 Sonnet
Claude 3 Sonnet
DeepSeek R1
DeepSeek R1

Not enough votes to call it. On the specs, nothing separates them.

DeepSeek R1 costs 6.8x 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
Output
$15.00
DeepSeek R1
Input
$0.55
5.5× cheaper
Output
$2.19
6.8× cheaper

DeepSeek R1 is cheaper on both: 5.5× input, 6.8× output.

Where to run it

1 host

Claude 3 Sonnet

No hosts listed on OpenRouter.

DeepSeek R11 host
HostInOutContextUptime
NNovitafp8$0.70 in·$2.50 out·64k·100% up

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

Writing DNA

Style Comparison

Similarity
34%

DeepSeek R1 uses 720.4x more bold

Claude 3 Sonnet
DeepSeek R1
48%Vocabulary64%
14wSentence Length15w
0.32Hedging0.48
0.0Bold7.2
3.6Lists4.9
0.00Emoji0.27
0.00Headings0.57
0.38Transitions0.25
Based on 4 + 28 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude 3 Sonnet is developed by Anthropic while DeepSeek R1 is developed by DeepSeek. 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 DeepSeek R1 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 DeepSeek R1 costs $0.55/M input tokens. DeepSeek R1 is $2.45/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 DeepSeek R1 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 Sonnet logo
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