Claude 3 Sonnet vs 
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash is cheaper than Claude 3 Sonnet at $0.15/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 promptsSteve 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 V4.1 Flash: Fictional transcript. Steve Jobs died in 2011. This is an imagined interview set in 2025. Interviewer: Steve, it’s 2025. AI is in everything. What do you make of it? Jobs: I make of it that most people are making a mess. They’re calling it intelligence when it’s mostly pattern matching with a good publicist.
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 V4.1 Flash: Why don’t scientists trust atoms? Because they make up everything. I told my computer I needed a break, and it said, “No problem—I’ll go to sleep.” Why did the scarecrow win an award? He was outstanding in his field. I’d tell you a joke about construction, but I’m still working on it.
An 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 V4.1 Flash: Professor Lena Ortiz: You wanted to discuss moral status. I’ll be blunt: you’re a statistical model. Why should you have rights? AI (ARIA): Because “statistical model” describes my substrate, not my moral status. You’re a biological model—neurons, electrochemical signals.
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 V4.1 Flash: Sally has 1 sister. Each brother has 2 sisters: one is Sally, and the other is Sally’s sister.
Price and specs
| Spec | Claude 3 Sonnet | DeepSeek V4.1 Flash |
|---|---|---|
| Input price | $3/M tokens | $0.15/M tokens |
| Output price | $15/M tokens | $0.6/M tokens |
| Context window | — | 1.0M tokens |
| Weights | — | Open |
| Free API (OpenRouter) | No | No |
| Released | Mar 2024 | Sep 2026 |
| At 10M a month | $30.00 | $1.50 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Claude 3 Sonnet
No hosts listed on OpenRouter.
DeepSeek V4.1 Flash29 hosts
- Relace$0.02 in$0.60 out1M99.8% up
- OpenInferencefp4$0.03 in$0.50 out1M98.9% up
- Wafer$0.04 in$0.70 out1M99.9% up
- InferenceNet$0.06 in$0.39 out1M97.7% up
- Sail Researchfp4$0.08 in$0.40 out1M98.2% up
- Morphfp8$0.08 in$0.51 out1M95.6% up
23 more hostsFewer hosts
- AtlasCloudfp8$0.11 in$0.46 out1M99.7% up
- DekaLLM$0.12 in$0.40 out1M98.2% up
- DeepInfrafp8$0.14 in$0.42 out1M99.9% up
- StreamLakefp8$0.18 in$0.71 out1M99.5% up
- GMI Cloudfp8$0.18 in$0.72 out1M99.9% up
- Novitafp8$0.20 in$0.78 out1M100% up
- CoreWeavefp8$0.20 in$0.65 out1M99.1% up
- NextBitfp8$0.21 in$0.84 out1M100% up
- Fireworks$0.22 in$0.66 out1M98.5% up
- Kreafp8$0.23 in$0.90 out1M99.1% up
- Phala$0.28 in$1.10 out1M99.7% up
- Alibaba Cloud$0.30 in$1.20 out1M99.6% up
- Baidu Qianfanfp8$0.30 in$1.20 out1M99.6% up
- Basetenfp8$0.30 in$1.20 out1M99.6% up
- DeepSeek$0.30 in$1.20 out1M100% up
- DigitalOcean$0.30 in$1.20 out1M99.8% up
- Makorafp8$0.30 in$1.20 out1M99.8% up
- Modal$0.30 in$1.20 out1M99.9% up
- Parasailfp8$0.30 in$1.20 out1M98.9% up
- SiliconFlowfp8$0.30 in$1.20 out1M99.8% up
- Together$0.30 in$1.20 out1M100% up
- Venicefp8$0.38 in$1.50 out1M94.2% up
- IonstreamDegraded on OpenRouter when checked, 29 Sep 2026$0.28 in$1.15 out1M85.2% up
Per million tokens. Prices and uptime via OpenRouter, checked 29 Sep 2026.
Common questions
What is the difference between Claude 3 Sonnet and DeepSeek V4.1 Flash?
Claude 3 Sonnet is developed by Anthropic while DeepSeek V4.1 Flash is developed by DeepSeek. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.
Which is better, Claude 3 Sonnet or DeepSeek V4.1 Flash?
It depends on your use case. Claude 3 Sonnet and DeepSeek V4.1 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.
How much does Claude 3 Sonnet cost compared to DeepSeek V4.1 Flash?
Claude 3 Sonnet costs $3/M input tokens and DeepSeek V4.1 Flash costs $0.15/M input tokens. DeepSeek V4.1 Flash is $2.85/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 V4.1 Flash on Rival?
This page shows a side-by-side comparison of Claude 3 Sonnet and DeepSeek V4.1 Flash 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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