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
  • Default Index
  • 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 Opus 5.5vsDeepSeek V4 Pro 0813
Updated Sep 2026

Claude Opus 5.5vsDeepSeek V4 Pro 0813

DeepSeek V4 Pro 0813 is cheaper than Claude Opus 5.5 at $0.66/M vs $4/M input tokens.

Claude Opus 5.5 and DeepSeek V4 Pro 0813 compared across 19 shared prompts
SpecClaude Opus 5.5DeepSeek V4 Pro 0813
Input price$4/M tokens$0.66/M tokens
Output price$20/M tokens$1.98/M tokens
Context window1.0M tokens1.0M tokens
WeightsClosedOpen
Free API (OpenRouter)NoNo
ReleasedSep 2026Aug 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 19 prompts both answered. Formatting stripped, words untouched.

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 5.5300 words
Midnight Silk Noodles Creamy, tangy peanut noodles with a gentle kick, ready faster than takeout. Serves: 2 Prep time: 5 minutes Cook time: 10 minutes Total time: 15 minutes The 7 Ingredients 8 oz (225 g) spaghetti (or any long noodle) ¼ cup creamy peanut butter 3 tablespoons soy sauce 1 tablespoon honey (or sugar) 1…
Read the full answer
DeepSeek V4 Pro 0813152 words
Golden Hour Crispy Chickpeas Serves 2–3 as a snack or side Prep: 5 min Cook: 25–30 min Ingredients (7 common pantry items) 1 can (15 oz) chickpeas, drained and rinsed 1 tablespoon olive oil ¼ cup grated Parmesan cheese ½ teaspoon garlic powder ½ teaspoon smoked paprika ¼ teaspoon salt ¼ teaspoon black pepper…
Read the full answer

Michelin Star Recipe Design

Design an innovative recipe for a multi-component dish worthy of a Michelin 3-star restaurant. The recipe should feature an unusual…

Claude Opus 5.52,253 words
"Hive & Tide" Langoustine, Beeswax, White Chocolate & Oscietra Caviar, Hay-Baked Celeriac, Fermented Green Strawberry, Sea Buckthorn I. The Concept Most coastal menus celebrate the meeting of sea and land. This dish is about a stranger, quieter meeting: the meadow and the seabed, the bee and the langoustine.
Read the full answer
DeepSeek V4 Pro 08131,665 words
Littoral Caramelised Orkney Scallop, Smoked Bone Marrow Custard, White Miso Butterscotch, Sea Buckthorn & Finger Lime Gel, Nori Buckwheat Tuile, Dill Ash Serves 4 Conceptual Narrative This dish is built on an unusual but deeply logical pairing: the sweet, saline delicacy of a hand-dived scallop and the primal…
Read the full answer

Advanced Investment Memo (IC Memo)

You are writing an internal investment committee memo for a long/short equity fund. Company (fictional): LedgerLift (ticker: LLLT) – B2B…

Claude Opus 5.51,335 words
IC Memo: LedgerLift (LLLT): Short, Starter Size, Hedged vs. Peer Basket Fictional exercise. Not investment advice. Recommendation Short (starter size, 1–1.5% gross), paired against a long basket of Peers A, B and C. 12-month price target range: $36–42 (current price $46, implying 9–22% downside). Thesis.
Read the full answer
DeepSeek V4 Pro 0813908 words
IC Memo: LedgerLift (LLLT) Recommendation: Short 12-month PT range: $25–$31 (probability-weighted DCF ~$29) Thesis: LLLT is a high-quality SaaS compounder, but at $46 the market is pricing roughly 6.5% terminal growth or ~6.3% WACC in our base model, leaving no margin for error.
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 5.51,853 words
The Next 48 Hours: CEO Action Plan The Core Decision We disclose. The question is how to do it well, not whether. Before the schedule, here are the three facts that drive every decision below. 1. The harm is concrete.
Read the full answer
DeepSeek V4 Pro 08131,282 words
Decision: I will not wait for more data. I will act immediately to validate, disclose, and mitigate. The signal is serious, the drug is widely used, and the current label is inadequate. Waiting creates unacceptable patient risk, legal exposure, regulatory damage, and securities-law liability.
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 5.52,280 words
Architecture Review: Real-Time Collaborative Editor The most serious problems cluster in three areas: the sync model (client-clock LWW), cross-server propagation (per-server WebSockets with DB polling), and the CDN/auth layer, which can leak data between users. Issues are grouped by area below.
Read the full answer
DeepSeek V4 Pro 08131,701 words
This architecture as described would have serious consistency, availability, and security problems for a real-time collaborative editor. The biggest root causes are client-clock last-write-wins, paragraph-level overwrites, server-local WebSocket fanout, database polling, full-snapshot writes, and CDN caching of API…
Read the full answer

Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

Claude Opus 5.53,099 words
The 90-Day Longevity & Performance Protocol A structured, measurable plan for the experienced biohacker How to Use This Plan Philosophy: Measure → Intervene → Re-measure. Every intervention has a hypothesis, a metric, and a decision rule.
Read the full answer
DeepSeek V4 Pro 0813772 words
3-Month Longevity & Performance Plan for a Biohacker Disclaimer: This plan is for educational purposes only and is not medical advice. It assumes you are a healthy, active adult with no contraindications. Some components—especially prescription drugs, fasting, and high-intensity training—require medical supervision.
Read the full answer
Our Verdict
Claude Opus 5.5
Claude Opus 5.5
DeepSeek V4 Pro 0813
DeepSeek V4 Pro 0813

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

DeepSeek V4 Pro 0813 costs 10x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Opus 5.5
Input
$4.00
Output
$20.00
DeepSeek V4 Pro 0813
Input
$0.66
6.1× cheaper
Output
$1.98
10× cheaper

DeepSeek V4 Pro 0813 is cheaper on both: 6.1× input, 10× output.

Where to run it

26 hosts, cheapest first

Claude Opus 5.54 hosts
HostInOutContextUptime
Amazon Bedrock$4.00 in·$20.00 out·1M·99.8% upAzure AI Foundry$4.00 in·$20.00 out·1M·100% upAnthropic$4.00 in·$20.00 out·1M·100% upGoogle Vertex AI$4.00 in·$20.00 out·1M·100% up
DeepSeek V4 Pro 081322 hosts
HostInOutContextUptime
Baidu Qianfanfp8$0.35 in·$1.05 out·1M·100% upWWafer$0.35 in·$2.90 out·1M·99.6% upIIonstream$0.39 in·$2.88 out·1M·99.8% upSSail Researchfp4$0.40 in·$4.30 out·1M·99.9% upSStreamLake$0.46 in·$1.39 out·1M·99.8% upNNovitafp8$0.99 in·$2.97 out·1M·100% up
16 more hostsFewer hosts
GGMI Cloudfp8$1.06 in·$3.17 out·1M·99.8% upNNextBitfp8$1.06 in·$3.17 out·1M·99.9% upAlibaba Cloud$1.12 in·$3.37 out·1M·99.5% upDDeepInfrafp8$1.30 in·$2.60 out·1M·99.7% upCCoreWeavefp8$1.31 in·$3.96 out·1M·99.8% upAAtlasCloudfp8$1.32 in·$3.96 out·1M·99.4% upBBasetenfp4$1.32 in·$3.96 out·1M·99.3% upCloudflare Workers AI$1.32 in·$3.96 out·1M·98.5% upDeepSeek$1.32 in·$3.96 out·1M·100% upDDigitalOcean$1.32 in·$3.96 out·1M·99.9% upFFireworks$1.32 in·$3.96 out·1M·98.9% upPParasailfp8$1.32 in·$3.96 out·1M·99.7% upSSiliconFlowfp8$1.32 in·$3.96 out·1M·99.5% upTTogether$1.32 in·$3.96 out·1M·99.1% upPPhala$1.45 in·$4.36 out·1M·99% upVVenice$1.65 in·$4.95 out·1M·99.6% up

Per million tokens. Prices and uptime via OpenRouter, checked 25 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Claude Opus 5.5 is developed by Anthropic while DeepSeek V4 Pro 0813 is developed by DeepSeek. Claude Opus 5.5 has a 1.0M token context window vs DeepSeek V4 Pro 0813's 1.0M. You can compare their actual outputs across 19 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude Opus 5.5 and DeepSeek V4 Pro 0813 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 19 challenges so you can judge which fits your needs best.

Claude Opus 5.5 costs $4/M input tokens and DeepSeek V4 Pro 0813 costs $0.66/M input tokens. DeepSeek V4 Pro 0813 is $3.34/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 5.5 and DeepSeek V4 Pro 0813 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 Opus 5.5 logoSolar Mini 4 logo
Claude Opus 5.5 vs Solar Mini 4Landed Sep 2026
DeepSeek V4 Pro 0813 logoQwen3.8 Max Prime logo
DeepSeek V4 Pro 0813 vs Qwen3.8 Max PrimeLanded Sep 2026
Claude Opus 5.5 logoGLM 5.3 Prime logo
Claude Opus 5.5 vs GLM 5.3 PrimeLanded Sep 2026
DeepSeek V4 Pro 0813 logoQwen3.8 Omni Flash logo
DeepSeek V4 Pro 0813 vs Qwen3.8 Omni FlashLanded Sep 2026
Claude Opus 5.5 logoCommand A+ logo
Claude Opus 5.5 vs Command A+Landed Sep 2026
DeepSeek V4 Pro 0813 logoGPT-6 Luna Pro logo
DeepSeek V4 Pro 0813 vs GPT-6 Luna ProLanded Sep 2026
Claude Opus 5.5 logoGPT-6 Sol Pro logo
Claude Opus 5.5 vs GPT-6 Sol ProLanded Sep 2026
DeepSeek V4 Pro 0813 logoGPT-6 Luna logo
DeepSeek V4 Pro 0813 vs GPT-6 LunaLanded Sep 2026

Same lab, same size, long tail

Claude Opus 5.5 logoClaude Opus 4.6 logo
Claude Opus 5.5 vs Claude Opus 4.6Same lab
Claude Opus 5.5 logoClaude Fable 5.1 logo
Claude Opus 5.5 vs Claude Fable 5.1Same lab
DeepSeek V4 Pro 0813 logoDeepSeek V3.1 logo
DeepSeek V4 Pro 0813 vs DeepSeek V3.1Version compare
DeepSeek V4 Pro 0813 logoDeepSeek V4 Flash Vision Exp logo
DeepSeek V4 Pro 0813 vs DeepSeek V4 Flash Vision ExpSame lab
DeepSeek V4 Pro 0813 logoGPT-6 Sol logo
DeepSeek V4 Pro 0813 vs GPT-6 SolNew provider
DeepSeek V4 Pro 0813 logoGPT-6 Sol Pro logo
DeepSeek V4 Pro 0813 vs GPT-6 Sol ProNew provider
DeepSeek V4 Pro 0813 logoGPT OSS 120B logo
DeepSeek V4 Pro 0813 vs GPT OSS 120BSame size
DeepSeek V4 Pro 0813 logoGPT OSS 20B logo
DeepSeek V4 Pro 0813 vs GPT OSS 20BNew provider

Model pages

Claude Opus 5.5 logo
Claude Opus 5.519 outputs, specs and price
DeepSeek V4 Pro 0813 logo
DeepSeek V4 Pro 081358 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
  • Default Index
  • 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