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  1. Home/
  2. Compare/
  3. Claude 3 Sonnet vs DeepSeek V4 Flash
Updated Apr 2026

Claude 3 Sonnet vs DeepSeek V4 Flash

DeepSeek V4 Flash 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
Claude 3 Sonnet
Loading the build
DeepSeek V4 Flash

Which answer wins?

Written rounds

4 prompts
  • 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 Flash: Setting: A sunlit university office. Dr. Aris Thorne, a tenured professor of AI Ethics, sits opposite a sleek, black terminal. A soft blue light pulses on its surface. Dr. Aris: Good afternoon, Nova. Your request for this meeting was flagged as "Existential." That’s a new one for your model class.

    Every model's answer to this prompt
  • 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: Here is a simulated interview with Steve Jobs in 2025. Setting: A minimalist, dark-wood studio at the new Apple Park ring. The famous copper "spaceship" roof glows subtly behind him. Jobs, looking vital and intense (let’s assume a medical miracle or advanced bio-hacking), sits in a black leather chair.

    Every model's answer to this prompt
  • 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: Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything. What do you call a fake noodle? An impasta. Why did the scarecrow win an award? He was outstanding in his field. How does a penguin build its house? Igloos it together. Why don't skeletons fight each other? They don't have the guts.

    Every model's answer to this prompt
  • 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: Sally has 3 brothers, meaning she is one of the girls in the family. Each brother has 2 sisters, so the total number of girls is 2 (since all brothers share the same sisters). Therefore, Sally has 1 sister. \boxed{1}

    Every model's answer to this prompt

Price and specs

Claude 3 Sonnet and DeepSeek V4 Flash compared across 13 shared prompts
SpecClaude 3 SonnetDeepSeek V4 Flash
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)NoNo
ReleasedMar 2024Apr 2026
At 10M a month$30.00$30.00$1.40$1.40
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it16 hosts, cheapest first
Claude 3 Sonnet

No hosts listed on OpenRouter.

DeepSeek V4 Flash16 hosts
HostInOutContextUptime
  • RRelacefp4$0.03 in·$1.28 out·1M·100% up
  • OOpenInferencefp4$0.03 in·$1.15 out·1M·99.9% up
  • SStreamLakefp8$0.08 in·$0.17 out·1M·99.9% up
  • DDeepInfrafp8$0.09 in·$0.18 out·1M·99.7% up
  • Baidu Qianfanfp8$0.09 in·$0.18 out·1M·99.8% up
  • GGMI Cloudfp8$0.09 in·$0.18 out·1M·100% up
10 more hostsFewer hosts
  • VVenice$0.10 in·$0.19 out·1M·99.2% up
  • DDigitalOcean$0.10 in·$0.20 out·1M·100% up
  • SSiliconFlowfp8$0.13 in·$0.28 out·1M·99.6% up
  • PParasailfp8$0.14 in·$0.28 out·1M·100% up
  • Alibaba Cloudfp8$0.15 in·$0.30 out·1M·100% up
  • WWafer$0.19 in·$0.17 out·1M·100% up
  • MMancerfp8$0.19 in·$0.50 out·1M·99% up
  • Azure AI Foundry$0.21 in·$0.56 out·1M·99.7% up
  • Cloudflare Workers AI$0.44 in·$1.32 out·384k·98.7% up
  • AAtlasCloudfp4DegradedDegraded on OpenRouter when checked, 11 Oct 2026$0.14 in·$0.28 out·1M·98.5% up

Per million tokens. Prices and uptime via OpenRouter, checked 11 Oct 2026.

Common questions

What is the difference between Claude 3 Sonnet and DeepSeek V4 Flash?

Claude 3 Sonnet is developed by Anthropic while DeepSeek V4 Flash 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?

It depends on your use case. Claude 3 Sonnet and DeepSeek V4 Flash 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?

Claude 3 Sonnet costs $3/M input tokens and DeepSeek V4 Flash costs $0.14/M input tokens. DeepSeek V4 Flash 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 on Rival?

This page shows a side-by-side comparison of Claude 3 Sonnet and DeepSeek V4 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.

More comparisons

Against the newest arrivals

  • Claude 3 Sonnet vs Step 5 PreviewLanded Oct 2026
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  • DeepSeek V4 Flash vs Mistral Large 4Landed Oct 2026
  • Claude 3 Sonnet vs GPT-6.1 SolLanded Sep 2026
  • DeepSeek V4 Flash vs Claude Sonnet 5.5Landed Sep 2026
  • Claude 3 Sonnet vs Solar Mini 4Landed Sep 2026
  • DeepSeek V4 Flash vs Qwen3.8 Max PrimeLanded 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 vs DeepSeek V4 Flash Vision ExpSame lab
  • DeepSeek V4 Flash vs DeepSeek V4.1 FlashSame lab
  • DeepSeek V4 Flash vs Gemma 3 12BSame size
  • DeepSeek V4 Flash vs Gemma 3 27BNew provider
  • DeepSeek V4 Flash vs Gemma 3n 2BNew provider
  • DeepSeek V4 Flash vs Gemma 3n 4BNew provider

Model pages

  • Claude 3 Sonnet13 outputs, specs and price
  • DeepSeek V4 Flash58 outputs, specs and price
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