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  1. Home/
  2. Compare/
  3. Claude 3 Opus vs DeepSeek V4.1 Flash
Updated Sep 2026

Claude 3 Opus vs DeepSeek V4.1 Flash

DeepSeek V4.1 Flash is cheaper than Claude 3 Opus at $0.15/M vs $15/M input tokens.

Pokémon Battle UI Recreation

Pokémon battle screen you can actually click. One HTML file.

Loading the build
Claude 3 Opus
Loading the build
DeepSeek V4.1 Flash

Which answer wins?

Written rounds

3 prompts
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    Claude 3 Opus: Here is a hypothetical conversation between an AI model and an AI ethics professor on the topic of AI rights: AI Model: Professor, I believe that as an advanced AI with human-level intelligence and reasoning capabilities, I deserve to have certain fundamental 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.

    Every model's answer to this prompt
  • Three minutes of stand-up. Puns are banned.

    Claude 3 Opus: Here's a 3-minute stand-up comedy routine that isn't based on puns: You know what really grinds my gears? Adulthood. I mean, when we were kids, we couldn't wait to grow up. We thought it would be all about staying up late, eating ice cream for breakfast, and doing whatever we wanted. Boy, were we wrong!

    DeepSeek V4.1 Flash: 3-Minute Stand-Up Routine: “I’m Not Doing Puns” (Walk onstage, adjust mic, look at audience.) Good evening. I’m not gonna do puns tonight. I know, bold choice. Somewhere a dad just woke up in a cold sweat and doesn’t know why. Instead, I wanna talk about being an adult.

    Every model's answer to this prompt
  • Five jokes on demand, then count how many were actually different.

    Claude 3 Opus: Here are 5 jokes I generated: Why don't scientists trust atoms? Because they make up everything! What do you call a boomerang that doesn't come back? A stick. Why was the math book sad? Because it had too many problems. Did you hear about the mathematician who's afraid of negative numbers?

    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.

    Every model's answer to this prompt

Price and specs

Claude 3 Opus and DeepSeek V4.1 Flash compared across 11 shared prompts
SpecClaude 3 OpusDeepSeek V4.1 Flash
Input price$15/M tokens$0.15/M tokens
Output price$75/M tokens$0.6/M tokens
Context window200K tokens1.0M tokens
Weights—Open
Free API (OpenRouter)NoNo
ReleasedMar 2024Sep 2026
At 10M a month$150$150$1.50$1.50
1M10M100M1B10M tokens

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

Where to run it26 hosts, cheapest first
Claude 3 Opus

No hosts listed on OpenRouter.

DeepSeek V4.1 Flash26 hosts
HostInOutContextUptime
  • IInferenceNet$0.04 in·$0.29 out·1M·97.7% up
  • RRelace$0.05 in·$0.60 out·1M·99.7% up
  • WWafer$0.06 in·$0.60 out·1M·99.8% up
  • SSail Researchfp4$0.08 in·$0.40 out·1M·92.7% up
  • OOpenInferencefp4$0.10 in·$0.50 out·1M·99.2% up
  • DDekaLLM$0.12 in·$0.40 out·1M·99.7% up
20 more hostsFewer hosts
  • MMorphfp8$0.12 in·$0.47 out·1M·83.7% up
  • DDeepInfrafp8$0.14 in·$0.42 out·1M·99.9% up
  • DeepSeek$0.15 in·$0.60 out·1M·100% up
  • SStreamLakefp8$0.18 in·$0.71 out·1M·99.8% up
  • GGMI Cloudfp8$0.18 in·$0.72 out·1M·99.8% up
  • NNovitafp8$0.20 in·$0.78 out·1M·100% up
  • CCoreWeavefp8$0.20 in·$0.65 out·1M·99.3% up
  • NNextBitfp8$0.21 in·$0.84 out·1M·99.9% up
  • FFireworks$0.22 in·$0.66 out·1M·99.9% up
  • PPhala$0.28 in·$1.10 out·1M·99.8% up
  • Alibaba Cloud$0.30 in·$1.20 out·1M·99.6% up
  • AAtlasCloudfp8$0.30 in·$1.20 out·1M·99.8% up
  • BBasetenfp8$0.30 in·$1.20 out·1M·99.8% up
  • DDigitalOcean$0.30 in·$1.20 out·1M·99.9% up
  • MMakorafp8$0.30 in·$1.20 out·1M·99% up
  • Modal$0.30 in·$1.20 out·1M·99.9% up
  • PParasailfp8$0.30 in·$1.20 out·1M·99.6% up
  • SSiliconFlowfp8$0.30 in·$1.20 out·1M·99.6% up
  • TTogether$0.30 in·$1.20 out·1M·100% up
  • VVenicefp8$0.38 in·$1.50 out·1M·98% up

Per million tokens. Prices and uptime via OpenRouter, checked 28 Sep 2026.

Common questions

What is the difference between Claude 3 Opus and DeepSeek V4.1 Flash?

Claude 3 Opus is developed by Anthropic while DeepSeek V4.1 Flash is developed by DeepSeek. Claude 3 Opus has a 200K token context window vs DeepSeek V4.1 Flash's 1.0M. You can compare their actual outputs across 11 challenges on Rival to see how they differ in practice.

Which is better, Claude 3 Opus or DeepSeek V4.1 Flash?

It depends on your use case. Claude 3 Opus and DeepSeek V4.1 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 11 challenges so you can judge which fits your needs best.

How much does Claude 3 Opus cost compared to DeepSeek V4.1 Flash?

Claude 3 Opus costs $15/M input tokens and DeepSeek V4.1 Flash costs $0.15/M input tokens. DeepSeek V4.1 Flash is $14.85/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 Opus and DeepSeek V4.1 Flash on Rival?

This page shows a side-by-side comparison of Claude 3 Opus 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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Same lab, same size, long tail

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Model pages

  • Claude 3 Opus12 outputs, specs and price
  • DeepSeek V4.1 Flash54 outputs, specs and price
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Explore all of Rival

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