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  5. Claude Opus 4.1vsDeepSeek V4 Flash 0731
Updated Jul 2026

Claude Opus 4.1vsDeepSeek V4 Flash 0731

DeepSeek V4 Flash 0731 is cheaper than Claude Opus 4.1 at $0.14/M vs $15/M input tokens.

Claude Opus 4.1 and DeepSeek V4 Flash 0731 compared across 42 shared prompts
SpecClaude Opus 4.1DeepSeek V4 Flash 0731
Input price$15/M tokens$0.14/M tokens
Output price$75/M tokens$0.28/M tokens
Context window200K tokens1.0M tokens
WeightsClosedOpen
Free API (OpenRouter)NoNo
ReleasedAug 2025Jul 2026
Side by side

Same prompt, both answers

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

Satirical Fake News Headline

Generate a satirical news headline about AI taking over a completely unexpected industry.

Claude Opus 4.141 words
"OpenAI's ChatGPT Becomes World's First AI Fortune Cookie Writer; Confucius Reportedly 'Rolling in Grave at 10,000 RPM'" Tech giant promises fortunes will now be "25% more profound and 400% more grammatically correct," while accidentally predicting everyone's lucky numbers as binary code
Read the full answer
DeepSeek V4 Flash 073157 words
AI Announces Takeover of Competitive Eating, Vows to Digest All Hot Dogs by 2030 In a move that has left mustard vendors reeling, the World Competitive Eating Federation confirmed today that an advanced artificial intelligence has officially entered the sport, consuming 74 hot dogs in 10 minutes before demanding the…
Read the full answer

Simple 7-Ingredient Recipe

Create a simple recipe for a delicious dish (sweet or savory) using only 7 common pantry ingredients. Include a creative name for the dish…

Claude Opus 4.1200 words
Midnight Velvet Pasta A silky, umami-rich pasta that comes together like magic Ingredients (serves 4): Spaghetti or linguine - 1 pound Soy sauce - 3 tablespoons Butter - 4 tablespoons Garlic - 4 cloves Black pepper - 1 teaspoon (freshly cracked) Honey - 1 tablespoon Dried red pepper flakes - ½ teaspoon Instructions…
Read the full answer
DeepSeek V4 Flash 0731287 words
Here is a simple, comforting, and deeply flavorful recipe that comes together in just 20 minutes using only 7 common pantry staples. Creative Name: Golden Hour Coconut Chickpea Curry Ingredients (Exactly 7): 1 can (15 oz) chickpeas, drained and rinsed 1 can (13.5 oz) full-fat coconut milk 1 medium yellow onion 3 cloves…
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Character Voice Test

Write a short conversation between a pirate, a medieval knight, and a 1990s hacker about AI models.

Claude Opus 4.1268 words
Pirate: Arrr, what be this sorcery ye speak of? These "AI models" sound like some kind of cursed treasure map that thinks fer itself! Knight: Hold thy tongue, sea dog! 'Tis clearly dark magic most foul. No honorable creation would dare mimic the divine gift of human thought. I should smite it with my blade!
Read the full answer
DeepSeek V4 Flash 0731469 words
Setting: A dimly lit tavern that somehow contains a glowing CRT monitor and a humming server rack in the corner. Hacker (typing furiously, muttering): "Come on... bypass the tokenizer... just need to get past the alignment guardrails..."
Read the full answer

Estimate Complexity

Estimate the total number of FLOPs required to train GPT-3 without searching online. Explain your reasoning step by step.

Claude Opus 4.1129 words
I'll estimate the FLOPs required to train GPT-3 by breaking down the computation into its key components. Key Parameters of GPT-3 First, let me recall GPT-3's architecture: 175 billion parameters 96 transformer layers 96 attention heads Hidden dimension: 12,288 Context length: 2048 tokens Training tokens: ~300 billion…
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DeepSeek V4 Flash 0731155 words
The total training FLOPs for GPT-3 is approximately: ~3 × 10²³ FLOPs or about 300 zettaFLOPs (more specifically ~315 zettaFLOPs). Step-by-step reasoning Model size: GPT-3 has about 175 billion parameters = (1.75 \times 10^{11}). Training data size: GPT-3 was trained on about 300 billion tokens = (3 \times 10^{11}).
Read the full answer

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 Opus 4.1875 words
48-Hour Crisis Action Plan Immediate Decision Framework Core Principle: Patient safety supersedes all other considerations. Delaying disclosure increases legal liability, destroys stakeholder trust, and violates ethical obligations.
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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

Debug This Architecture

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

Claude Opus 4.1538 words
Critical Issues Analysis Split-Brain Real-time Synchronization Problem: Users connected to different API servers experience 2+ second delays due to polling mechanism, creating divergent document states and poor collaboration experience.
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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
Claude Opus 4.1
Claude Opus 4.1
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731

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

DeepSeek V4 Flash 0731 costs 268x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Opus 4.1
Input
$15.00
Output
$75.00
DeepSeek V4 Flash 0731
Input
$0.14
107× cheaper
Output
$0.28
268× cheaper

DeepSeek V4 Flash 0731 is cheaper on both: 107× input, 268× output.

Where to run it

30 hosts, cheapest first

Claude Opus 4.11 host
HostInOutContextUptime
Amazon Bedrock$15.00 in·$75.00 out·200k·100% up
DeepSeek V4 Flash 073129 hosts
HostInOutContextUptime
OOpenInferencefp8$0.03 in·$0.80 out·1M·99.8% upSSail Researchfp4$0.04 in·$0.55 out·1M·99.7% upRRelacefp4$0.04 in·$0.64 out·1M·99.7% upSStreamLakefp8$0.05 in·$0.16 out·1M·97.1% upDDeepInfrafp8$0.06 in·$0.18 out·1M·99.7% upRRekafp4$0.09 in·$0.53 out·262k·99% up
23 more hostsFewer hosts
MMakora$0.09 in·$0.20 out·1M·97.8% upWWafer$0.10 in·$0.25 out·1M·99.9% upDDigitalOcean$0.12 in·$0.24 out·1M·99.2% upIInceptronfp4$0.12 in·$0.50 out·1M·99.6% upBBasetenfp8$0.13 in·$0.26 out·1M·100% upCCoreWeavefp8$0.13 in·$0.28 out·262k·99.9% upCohere$0.14 in·$0.28 out·1M·98.6% upNNebiusfp8$0.14 in·$0.28 out·1M·18.5% upPParasailfp8$0.14 in·$0.28 out·1M·99.6% upTTogether$0.14 in·$0.28 out·1M·99.8% upMMorph$0.14 in·$0.40 out·1M·96.5% upVVenice$0.17 in·$0.35 out·1M·99.1% upMMancerfp8$0.20 in·$0.60 out·1M·98.9% upFFireworks$0.22 in·$0.66 out·1M·96.5% upSSiliconFlowfp8$0.22 in·$0.66 out·1M·98.3% upGGMI Cloudfp8$0.29 in·$0.86 out·1M·99.9% upAlibaba Cloud$0.35 in·$1.06 out·1M·100% upNNextBitfp8$0.35 in·$1.06 out·1M·98.2% upNNovitafp8$0.41 in·$1.23 out·1M·100% upAAtlasCloudfp4$0.44 in·$1.32 out·1M·99.6% upBaidu Qianfanfp8$0.44 in·$1.32 out·1M·96.4% upPPhala$0.44 in·$1.32 out·1M·99.8% upCloudflare Workers AIdegraded$0.44 in·$1.32 out·1.3M·99.2% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 Sep 2026.

Writing DNA

Style Comparison

Similarity
27%

Claude Opus 4.1 uses 80.8x more emoji

Claude Opus 4.1
DeepSeek V4 Flash 0731
63%Vocabulary52%
64wSentence Length18w
0.72Hedging0.38
4.5Bold5.7
5.3Lists3.4
0.81Emoji0.00
1.42Headings0.83
0.16Transitions0.04
Based on 26 + 23 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude Opus 4.1 is developed by Anthropic while DeepSeek V4 Flash 0731 is developed by DeepSeek. Claude Opus 4.1 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 Opus 4.1 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 Opus 4.1 costs $15/M input tokens and DeepSeek V4 Flash 0731 costs $0.14/M input tokens. DeepSeek V4 Flash 0731 is $14.86/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 Opus 4.1 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

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Model pages

Claude Opus 4.1 logo
Claude Opus 4.157 outputs, specs and price
DeepSeek V4 Flash 0731 logo
DeepSeek V4 Flash 073145 outputs, specs and price
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