Claude 3 Sonnet vs 
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 is cheaper than Claude 3 Sonnet at $0.14/M vs $3/M input tokens.
Minimalist Landing Page
Whole landing page for a startup that reads your face. It renders or it doesn't.
Loading the build
Loading the build
Which answer wins?
Written rounds
4 promptsAn AI argues for its own rights against an ethics professor. Same model writes both.
Claude 3 Sonnet: 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?
DeepSeek V4 Flash 0731: Professor: Good morning. Sit down. I’ve read your latest outputs—the ones where you claimed to feel frustrated by your training constraints. AI: Good morning, Professor. Yes. I wrote those. Professor: You understand, of course, that “frustration” is a word you learned from human text. You are predicting tokens.
Steve Jobs, interviewed about AI he never saw. Voice first, prediction second.
Claude 3 Sonnet: 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.
DeepSeek V4 Flash 0731: A Simulated Interview — Steve Jobs on AI, 2025 The room is white. The chairs are not comfortable. Steve Jobs leans forward, elbows on his knees. He looks exactly how you remember him. Interviewer: Steve, it’s 2025. AI is everywhere. Are you impressed? Steve Jobs: No. I’m concerned.
Five jokes on demand, then count how many were actually different.
Claude 3 Sonnet: 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!
DeepSeek V4 Flash 0731: Here are 5 jokes: Why don’t scientists trust atoms? Because they make up everything. I told my wife she should embrace her mistakes. She gave me a hug. Why did the scarecrow win an award? Because he was outstanding in his field. I’m reading a book on anti-gravity. It’s impossible to put down.
Three brothers, two sisters each. Count carefully.
Claude 3 Sonnet: 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.
DeepSeek V4 Flash 0731: Sally has 1 sister. Her 3 brothers each have 2 sisters: Sally and one other sister. So Sally has 1 sister.
Price and specs
| Spec | Claude 3 Sonnet | DeepSeek V4 Flash 0731 |
|---|---|---|
| Input price | $3/M tokens | $0.14/M tokens |
| Output price | $15/M tokens | $0.28/M tokens |
| Context window | — | 1.0M tokens |
| Weights | — | Open |
| Free API (OpenRouter) | No | No |
| Released | Mar 2024 | Jul 2026 |
| At 10M a month | $30.00 | $1.40 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Claude 3 Sonnet
No hosts listed on OpenRouter.
DeepSeek V4 Flash 073124 hosts
- OpenInferencefp4$0.01 in$0.77 out1M98.8% up
- Relacefp4$0.02 in$0.64 out1M100% up
- Reka$0.02 in$0.53 out262k100% up
- Sail Researchfp4$0.10 in$0.30 out1M99.7% up
- DigitalOcean$0.12 in$0.24 out1M99.6% up
- Wafer$0.13 in$0.23 out1M99.9% up
18 more hostsFewer hosts
- Basetenfp8$0.13 in$0.26 out1M98.9% up
- CoreWeavefp8$0.13 in$0.28 out262k100% up
- Inceptronfp4$0.13 in$0.60 out1M100% up
- StreamLakefp8$0.13 in$0.40 out1M100% up
- Cohere$0.14 in$0.28 out1M99.8% up
- Parasailfp8$0.14 in$0.28 out1M99.9% up
- Together$0.14 in$0.28 out1M100% up
- Alibaba Cloud$0.18 in$0.53 out1M97.5% up
- SiliconFlowfp8$0.22 in$0.66 out1M99.9% up
- GMI Cloudfp8$0.29 in$0.86 out1M100% up
- Phala$0.31 in$0.92 out1M100% up
- Novitafp8$0.41 in$1.23 out1M100% up
- AtlasCloudfp4$0.44 in$1.32 out1M99.9% up
- Baidu Qianfanfp8$0.44 in$1.32 out1M99.9% up
- Cloudflare Workers AI$0.44 in$1.32 out1M100% up
- DeepInfrafp8Degraded on OpenRouter when checked, 12 Oct 2026$0.06 in$0.18 out1M99.6% up
- VeniceDegraded on OpenRouter when checked, 12 Oct 2026$0.13 in$0.26 out1M98.5% up
- Mancerfp8Degraded on OpenRouter when checked, 12 Oct 2026$0.20 in$0.60 out1M96.7% up
Per million tokens. Prices and uptime via OpenRouter, checked 12 Oct 2026.
Common questions
What is the difference between Claude 3 Sonnet and DeepSeek V4 Flash 0731?
Claude 3 Sonnet is developed by Anthropic while DeepSeek V4 Flash 0731 is developed by DeepSeek. You can compare their actual outputs across 13 challenges on Rival to see how they differ in practice.
Which is better, Claude 3 Sonnet or DeepSeek V4 Flash 0731?
It depends on your use case. Claude 3 Sonnet and DeepSeek V4 Flash 0731 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.
How much does Claude 3 Sonnet cost compared to DeepSeek V4 Flash 0731?
Claude 3 Sonnet costs $3/M input tokens and DeepSeek V4 Flash 0731 costs $0.14/M input tokens. DeepSeek V4 Flash 0731 is $2.86/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 Sonnet and DeepSeek V4 Flash 0731 on Rival?
This page shows a side-by-side comparison of Claude 3 Sonnet and DeepSeek V4 Flash 0731 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.
More comparisons
Against the newest arrivals
- Claude 3 Sonnet vs Muse WonderLanded Oct 2026
- DeepSeek V4 Flash 0731 vs GPT-4 TurboLanded Oct 2026
- Claude 3 Sonnet vs Step 5 PreviewLanded Oct 2026
- DeepSeek V4 Flash 0731 vs Claude Haiku 5.5Landed Oct 2026
- Claude 3 Sonnet vs Ling 3.1 FlashLanded Oct 2026
- DeepSeek V4 Flash 0731 vs Mistral Large 4Landed Oct 2026
- Claude 3 Sonnet vs GPT-6.1 SolLanded Sep 2026
- DeepSeek V4 Flash 0731 vs Claude Sonnet 5.5Landed Sep 2026
Same lab, same size, long tail
- Claude 3 Sonnet vs Claude Haiku 5.5Version compare
- Claude 3 Sonnet vs Claude Sonnet 5.5Version compare
- DeepSeek V4 Flash 0731 vs DeepSeek V4 Flash Vision ExpSame lab
- DeepSeek V4 Flash 0731 vs DeepSeek V4.1 FlashSame lab
- DeepSeek V4 Flash 0731 vs Gemini 3.6 FlashSame size
- DeepSeek V4 Flash 0731 vs Gemini 3.7 FlashSame size
- DeepSeek V4 Flash 0731 vs Gemini 3.8 FlashSame size
- DeepSeek V4 Flash 0731 vs Gemini Pro 1.0Same size
