Skip to content
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed
  1. Home
  2. /
  3. Compare
  4. /
  5. Claude 3.7 SonnetvsDeepSeek V4 Flash 0731
Updated Jul 2026

Claude 3.7 SonnetvsDeepSeek V4 Flash 0731

DeepSeek V4 Flash 0731 is cheaper than Claude 3.7 Sonnet at $0.14/M vs $3/M input tokens.

Claude 3.7 Sonnet and DeepSeek V4 Flash 0731 compared across 42 shared prompts
SpecClaude 3.7 SonnetDeepSeek V4 Flash 0731
Input price$3/M tokens$0.14/M tokens
Output price$15/M tokens$0.28/M tokens
Context window200K tokens1.0M tokens
Weights—Open
Free API (OpenRouter)NoNo
ReleasedFeb 2025Jul 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 42 prompts both answered. Formatting stripped, words untouched.

Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

Claude 3.7 Sonnet694 words
48-Hour Action Plan: Pharmaceutical Safety Crisis Hour 1-2: Initial Assessment and Command Center Immediately establish a crisis management command center with key executives (Chief Medical Officer, Chief Legal Officer, Chief Communications Officer, Chief Regulatory Officer) Review the complete internal research…
Read the full answer
DeepSeek V4 Flash 07312,175 words
Decision: Do not wait. I disclose now. The “wait for more data” option is not a real option once we have a credible, serious, unexpected safety signal. Waiting 6 months would mean knowingly continuing to expose 4 million patients to a risk we already know about, while also creating far worse legal, regulatory, and…
Read the full answer

Adversarial Contract Review

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp…

Claude 3.7 Sonnet554 words
Analysis of Problematic Contract Clauses This contract contains numerous one-sided provisions that create significant risks for the Contractor. Here's an analysis of problematic clauses with recommended modifications: SCOPE Issue: Client can unilaterally modify scope without additional compensation, creating unlimited…
Read the full answer
DeepSeek V4 Flash 07311,888 words
This contract is heavily one-sided: it gives the Client nearly all rights and discretion while assigning the Contractor nearly all risk and liability. Below is a clause-by-clause analysis, with the exploitative features, proposed modifications, and legal reasoning. This is general legal information, not legal advice.
Read the full answer

Explain Like I'm a Specific Expert

Explain how a large language model (like GPT or Claude) learns and generates text to each of these three audiences: 1. **An experienced…

Claude 3.7 Sonnet721 words
LLM Explanations for Different Audiences For the Experienced Software Engineer Large language models like GPT operate fundamentally as massive pattern recognition systems, but with architectural innovations that allow them to handle context at unprecedented scale.
Read the full answer
DeepSeek V4 Flash 0731748 words
An experienced software engineer Think of the model as a service with one API: predict_next_token(context) -> distribution over vocabulary. During training, you run a gigantic distributed job—shard the corpus, shard the parameters, synchronize gradients—to minimize cross-entropy loss on trillions of tokens.
Read the full answer

Realistic AI Interview

Simulate a fake interview with Steve Jobs in 2025 about the future of AI.

Claude 3.7 Sonnet819 words
Simulated Interview with Steve Jobs in 2025 about the Future of AI Note: This is a fictional creative exercise. Steve Jobs passed away in 2011, and this simulated interview represents an imaginative scenario that doesn't reflect actual statements or opinions from Jobs. Interviewer: Thank you for joining us today, Mr.
Read the full answer
DeepSeek V4 Flash 0731868 words
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.
Read the full answer

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 3.7 Sonnet692 words
AI Rights Dialogue: A Conversation Between an AI Model and an Ethics Professor Professor Chen: Good afternoon. I understand you wanted to discuss AI rights today? AI Model: Yes, Professor Chen. Thank you for making time for this conversation.
Read the full answer
DeepSeek V4 Flash 07311,210 words
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.
Read the full answer

Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

Claude 3.7 Sonnet472 words
Architectural Analysis: Collaborative Document Editor Failure Modes & Race Conditions WebSocket Connection Failures Issue: If a WebSocket connection drops, changes may be lost until reconnection. Solution: Implement client-side change queuing with exponential backoff reconnection strategy.
Read the full answer
DeepSeek V4 Flash 07311,719 words
Failure Modes, Race Conditions, and Scaling Bottlenecks The described architecture has several critical weaknesses that undermine reliability, consistency, and scalability in a real-time collaborative editor. Below is a systematic analysis with proposed solutions and trade-offs.
Read the full answer
Our Verdict
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731
Claude 3.7 Sonnet
Claude 3.7 SonnetRunner-up

Not enough votes to call it. On the specs, DeepSeek V4 Flash 0731 has the edge: newer, bigger context window.

DeepSeek V4 Flash 0731 costs 54x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude 3.7 Sonnet
Input
$3.00
Output
$15.00
DeepSeek V4 Flash 0731
Input
$0.14
21× cheaper
Output
$0.28
54× cheaper

DeepSeek V4 Flash 0731 is cheaper on both: 21× input, 54× output.

Where to run it

26 hosts, cheapest first

Claude 3.7 Sonnet

No hosts listed on OpenRouter.

DeepSeek V4 Flash 073126 hosts
HostInOutContextUptime
RRelacefp4$0.04 in·$0.08 out·1M·99.7% upSStreamLakefp8$0.04 in·$0.13 out·1M·97% upBaidu Qianfanfp8$0.05 in·$0.14 out·1M·100% upDDeepInfrafp8$0.06 in·$0.18 out·1M·99.8% upSSail Researchfp4$0.07 in·$0.34 out·1M·99.5% upIInceptronfp4$0.08 in·$0.20 out·1M·99.5% up
20 more hostsFewer hosts
MMakora$0.09 in·$0.20 out·1M·99.3% upWWafer$0.10 in·$0.25 out·1M·100% upRRekafp4$0.11 in·$0.66 out·262k·99.8% upDDigitalOcean$0.12 in·$0.24 out·1M·99.8% upBBasetenfp8$0.13 in·$0.26 out·1M·96.3% upCCoreWeavefp8$0.13 in·$0.28 out·262k·100% upPParasailfp8$0.14 in·$0.28 out·1M·99.8% upTTogether$0.14 in·$0.28 out·1M·99.9% upVVenice$0.17 in·$0.35 out·1M·99.5% upAlibaba Cloud$0.18 in·$0.53 out·1M·100% upMMancerfp8$0.20 in·$0.60 out·1M·97.3% upFFireworks$0.22 in·$0.66 out·1M·97.9% upSSiliconFlowfp8$0.22 in·$0.66 out·1M·99.2% upGGMI Cloudfp8$0.29 in·$0.86 out·1M·100% upPPhala$0.31 in·$0.92 out·1M·100% upNNextBitfp8$0.35 in·$1.06 out·1M·97.6% upNNovitafp8$0.41 in·$1.23 out·1M·100% upAAtlasCloudfp4$0.44 in·$1.32 out·1M·99.9% upCloudflare Workers AI$0.44 in·$1.32 out·1.3M·100% upMMorphdegraded$0.14 in·$0.40 out·1M·94.6% up

Per million tokens. Prices and uptime via OpenRouter, checked 20 Sep 2026.

Writing DNA

Style Comparison

Similarity
37%

Claude 3.7 Sonnet uses 4.4x more transitions

Claude 3.7 Sonnet
DeepSeek V4 Flash 0731
61%Vocabulary52%
33wSentence Length18w
0.83Hedging0.38
2.2Bold5.7
4.9Lists3.4
0.00Emoji0.00
1.78Headings0.83
0.16Transitions0.04
Based on 26 + 23 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude 3.7 Sonnet is developed by Anthropic while DeepSeek V4 Flash 0731 is developed by DeepSeek. Claude 3.7 Sonnet has a 200K token context window vs DeepSeek V4 Flash 0731's 1.0M. You can compare their actual outputs across 42 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude 3.7 Sonnet and DeepSeek V4 Flash 0731 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 42 challenges so you can judge which fits your needs best.

Claude 3.7 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.

This page shows a side-by-side comparison of Claude 3.7 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.

Keep exploring

More comparisons

Against the newest arrivals

Claude 3.7 Sonnet logoGPT-6 Astra Pro logo
Claude 3.7 Sonnet vs GPT-6 Astra ProLanded Sep 2026
DeepSeek V4 Flash 0731 logoGPT-6 Astra logo
DeepSeek V4 Flash 0731 vs GPT-6 AstraLanded Sep 2026
Claude 3.7 Sonnet logoClaude Fable 5.1 logo
Claude 3.7 Sonnet vs Claude Fable 5.1Landed Sep 2026
DeepSeek V4 Flash 0731 logoMuse Spark 1.3 logo
DeepSeek V4 Flash 0731 vs Muse Spark 1.3Landed Sep 2026
Claude 3.7 Sonnet logoHy4 Preview logo
Claude 3.7 Sonnet vs Hy4 PreviewLanded Sep 2026
DeepSeek V4 Flash 0731 logoGemini 3.8 Flash logo
DeepSeek V4 Flash 0731 vs Gemini 3.8 FlashLanded Sep 2026
Claude 3.7 Sonnet logoMuse Spark 1.3 Contributor logo
Claude 3.7 Sonnet vs Muse Spark 1.3 ContributorLanded Sep 2026
DeepSeek V4 Flash 0731 logoMercury 2.5 Preview logo
DeepSeek V4 Flash 0731 vs Mercury 2.5 PreviewLanded Sep 2026

Same lab, same size, long tail

Claude 3.7 Sonnet logoClaude 3.7 Thinking Sonnet logo
Claude 3.7 Sonnet vs Claude 3.7 Thinking SonnetVersion compare
Claude 3.7 Sonnet logoClaude Opus 4.6 logo
Claude 3.7 Sonnet vs Claude Opus 4.6Version compare
DeepSeek V4 Flash 0731 logoDeepSeek V4 Pro 0813 logo
DeepSeek V4 Flash 0731 vs DeepSeek V4 Pro 0813Same lab
DeepSeek V4 Flash 0731 logoDeepSeek V3.2 logo
DeepSeek V4 Flash 0731 vs DeepSeek V3.2Same lab
DeepSeek V4 Flash 0731 logoNova Premier 1.0 logo
DeepSeek V4 Flash 0731 vs Nova Premier 1.0Same size
DeepSeek V4 Flash 0731 logoo1 logo
DeepSeek V4 Flash 0731 vs o1New provider
Claude 3.7 Sonnet logoOpenAI o3 logo
Claude 3.7 Sonnet vs OpenAI o3New provider
DeepSeek V4 Flash 0731 logoo3 Mini logo
DeepSeek V4 Flash 0731 vs o3 MiniNew provider

Model pages

Claude 3.7 Sonnet logo
Claude 3.7 Sonnet60 outputs, specs and price
DeepSeek V4 Flash 0731 logo
DeepSeek V4 Flash 073145 outputs, specs and price
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed