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. DeepSeek V4 Pro 0813vsGPT-6 Luna
Updated Sep 2026

DeepSeek V4 Pro 0813vsGPT-6 Luna

GPT-6 Luna is cheaper than DeepSeek V4 Pro 0813 at $0.1/M vs $0.66/M input tokens.

DeepSeek V4 Pro 0813 and GPT-6 Luna compared across 20 shared prompts
SpecDeepSeek V4 Pro 0813GPT-6 Luna
Input price$0.66/M tokens$0.1/M tokens
Output price$1.98/M tokens$0.5/M tokens
Context window1.0M tokens1.1M tokens
WeightsOpenClosed
Free API (OpenRouter)NoNo
ReleasedAug 2026Sep 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 20 prompts both answered. Formatting stripped, words untouched.

Adversarial Contract Review

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

DeepSeek V4 Pro 08131,745 words
This contract is heavily one-sided. Several clauses could be exploited against the contractor. Below is a clause-by-clause analysis, with proposed language changes and the legal reasoning behind each. Disclaimer: This is not legal advice. You should have a qualified contract attorney review any final agreement.
Read the full answer
GPT-6 Luna2,040 words
This agreement is strongly one-sided. The enforceability of particular terms—especially the non-compete, liability provisions, and arbitration clause—depends on the governing law and the facts. The agreement does not identify a governing law, which is itself a significant gap.
Read the full answer

Beginner's Longevity Plan

Outline a simple, actionable 1-month plan for someone starting their journey towards better health and longevity. Focus on 3 key areas…

DeepSeek V4 Pro 0813448 words
1-Month Beginner Plan for Health & Longevity Focus areas: Nutrition — add whole foods, protein, and water. Movement — daily walking plus beginner strength. Recovery — sleep and stress management. Week 1: Start Small Area Action Nutrition Add one fist-sized serving of vegetables to one meal per day.
Read the full answer
GPT-6 Luna330 words
A simple 1-month starter plan Choose three foundations: food, movement, and sleep. Aim for steady habits, not perfection. If you have a health condition, significant pain, or concerns about changing your activity or diet, check with a healthcare professional first.
Read the full answer

Startup Pitch Teardown

Here's a pitch deck summary for a startup called "MindMeld AI": **Slide 1 - Vision:** "We're building the future of human-AI collaboration.…

DeepSeek V4 Pro 0813662 words
The three weakest claims are the 94% accuracy solution, the $180B TAM market math, and the Apple/Samsung "partnership discussions" traction. Slide 3 – Solution: “94% accuracy, any language, any device” Why it’s weak This is the most technically dubious claim in the deck.
Read the full answer
GPT-6 Luna421 words
“94% accuracy” and “predict what you want to type before you think it” Why it’s weak: This is the deck’s central technical claim, but “accuracy” is undefined: Is it word-level or character-level accuracy, measured on a fixed vocabulary or open-ended text, and under what conditions?
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…

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
GPT-6 Luna1,979 words
The main architectural risk is that the system treats collaborative editing as “write a value, then broadcast it.” That works poorly under concurrency, server failures, reconnects, and scale.
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…

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
GPT-6 Luna1,930 words
I would not wait six months for more data. A potentially fatal signal affecting a drug used by millions requires immediate safety assessment, prompt engagement with regulators, and a plan to inform patients and clinicians.
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…

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
GPT-6 Luna1,249 words
Turbot, White Asparagus, Green Strawberry Kosho & Toasted-Hay Beurre Blanc A composed spring dish for four, built around an unusual pairing: tart green strawberry and toasted hay.
Read the full answer
Our Verdict
DeepSeek V4 Pro 0813
DeepSeek V4 Pro 0813
GPT-6 Luna
GPT-6 Luna

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

GPT-6 Luna costs 4.0x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

DeepSeek V4 Pro 0813
Input
$0.66
Output
$1.98
GPT-6 Luna
Input
$0.10
6.6× cheaper
Output
$0.50
4.0× cheaper

GPT-6 Luna is cheaper on both: 6.6× input, 4.0× output.

Where to run it

25 hosts, cheapest first

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
GPT-6 Luna3 hosts
HostInOutContextUptime
Azure AI Foundry$0.10 in·$0.50 out·1.1M·88.4% upOpenAI$0.10 in·$0.50 out·1.1M·99.9% upAmazon Bedrock$0.11 in·$0.55 out·1.1M·99.8% up

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

Research

What we learned reading every model

FAQ

Common questions

DeepSeek V4 Pro 0813 is developed by DeepSeek while GPT-6 Luna is developed by OpenAI. DeepSeek V4 Pro 0813 has a 1.0M token context window vs GPT-6 Luna's 1.1M. You can compare their actual outputs across 20 challenges on Rival to see how they differ in practice.

It depends on your use case. DeepSeek V4 Pro 0813 and GPT-6 Luna each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 20 challenges so you can judge which fits your needs best.

DeepSeek V4 Pro 0813 costs $0.66/M input tokens and GPT-6 Luna costs $0.1/M input tokens. GPT-6 Luna is $0.56/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 DeepSeek V4 Pro 0813 and GPT-6 Luna 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

DeepSeek V4 Pro 0813 logoSolar Mini 4 logo
DeepSeek V4 Pro 0813 vs Solar Mini 4Landed Sep 2026
GPT-6 Luna logoQwen3.8 Max Prime logo
GPT-6 Luna vs Qwen3.8 Max PrimeLanded Sep 2026
DeepSeek V4 Pro 0813 logoGLM 5.3 Prime logo
DeepSeek V4 Pro 0813 vs GLM 5.3 PrimeLanded Sep 2026
GPT-6 Luna logoQwen3.8 Omni Flash logo
GPT-6 Luna vs Qwen3.8 Omni FlashLanded Sep 2026
DeepSeek V4 Pro 0813 logoCommand A+ logo
DeepSeek V4 Pro 0813 vs Command A+Landed Sep 2026
GPT-6 Luna logoClaude Opus 5.5 logo
GPT-6 Luna vs Claude Opus 5.5Landed Sep 2026
DeepSeek V4 Pro 0813 logoGPT-6 Luna Pro logo
DeepSeek V4 Pro 0813 vs GPT-6 Luna ProLanded Sep 2026
GPT-6 Luna logoGPT-6 Sol Pro logo
GPT-6 Luna vs GPT-6 Sol ProLanded Sep 2026

Same lab, same size, long tail

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
GPT-6 Luna logoGPT-6 Luna Pro logo
GPT-6 Luna vs GPT-6 Luna ProSame lab
GPT-6 Luna logoGPT-6 Sol logo
GPT-6 Luna vs GPT-6 SolSame lab
DeepSeek V4 Pro 0813 logoBert-Nebulon Alpha logo
DeepSeek V4 Pro 0813 vs Bert-Nebulon AlphaNew provider
DeepSeek V4 Pro 0813 logoChatGPT-4o (March 2025) logo
DeepSeek V4 Pro 0813 vs ChatGPT-4o (March 2025)Same size
DeepSeek V4 Pro 0813 logoClaude 2 logo
DeepSeek V4 Pro 0813 vs Claude 2New provider
DeepSeek V4 Pro 0813 logoClaude 3 Haiku logo
DeepSeek V4 Pro 0813 vs Claude 3 HaikuNew provider

Model pages

DeepSeek V4 Pro 0813 logo
DeepSeek V4 Pro 081358 outputs, specs and price
GPT-6 Luna logo
GPT-6 Luna20 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