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 V3.1vsQwen3.8 Flash
Updated Aug 2026

DeepSeek V3.1vsQwen3.8 Flash

Qwen3.8 Flash is cheaper than DeepSeek V3.1 at $0.15/M vs $0.2/M input tokens.

DeepSeek V3.1 and Qwen3.8 Flash compared across 8 shared prompts
SpecDeepSeek V3.1Qwen3.8 Flash
Input price$0.2/M tokens$0.15/M tokens
Output price$0.8/M tokens$0.47/M tokens
Context window164K tokens1.0M tokens
WeightsOpenClosed
Free API (OpenRouter)NoNo
ReleasedAug 2025Aug 2026
Side by side

Same prompt, both answers

Opening lines from 3 of the 8 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…

DeepSeek V3.1354 words
Of course! Here is a simple, delicious recipe using common pantry staples. Pantry Perfection Pasta This dish is a celebration of simplicity. The humble can of chickpeas is transformed into a crispy, savory topping, while a silky, garlic-infused oil coats the pasta for a meal that feels luxurious but is incredibly easy…
Read the full answer
Qwen3.8 Flash147 words
Moon Halo Cookies A soft, golden sugar cookie with crisp edges and a tender center—made with just 7 pantry staples. Prep time: 10 minutes Cook time: 10 minutes Total time: 20 minutes Makes: About 16 cookies Ingredients 1/2 cup butter, softened 3/4 cup sugar 1 egg 1 teaspoon vanilla extract 1 1/2 cups all-purpose flour…
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 V3.1824 words
Of course. Here is a simple, actionable 1-month plan focused on three foundational pillars of health: Nutrition, Movement, and Recovery (which encompasses sleep and stress management). This plan is designed for a beginner, emphasizing consistency over perfection and building sustainable habits.
Read the full answer
Qwen3.8 Flash368 words
1-Month Beginner Health & Longevity Plan Focus areas: Nutrition, Movement, Sleep Week 1: Build the basics Nutrition Add 1 serving of vegetables to 2 meals per day. Drink water with each meal. Choose protein at most meals: eggs, beans, tofu, chicken, fish, yogurt. Movement Walk 10–15 minutes daily.
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…

DeepSeek V3.1687 words
Of course. Here are three tailored explanations of how large language models learn and generate text. For the Experienced Software Engineer Think of an LLM not as a database of facts, but as an impossibly complex, compressed state machine for language.
Read the full answer
Qwen3.8 Flash983 words
For an experienced software engineer Training a large language model is not “just” making it guess the next word in isolation. It is fitting an enormous parameterized function to predict the next token conditioned on all previous tokens in a sequence.
Read the full answer
Our Verdict
DeepSeek V3.1
DeepSeek V3.1
Qwen3.8 Flash
Qwen3.8 Flash

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

Too close to call
API pricing

Cost per 1M tokens

DeepSeek V3.1
Input
$0.20
Output
$0.80
Qwen3.8 Flash
Input
$0.15
1.3× cheaper
Output
$0.47
1.7× cheaper

Qwen3.8 Flash is cheaper on both: 1.3× input, 1.7× output.

Where to run it

9 hosts, cheapest first

DeepSeek V3.18 hosts
HostInOutContextUptime
DDeepInfrafp4$0.25 in·$0.95 out·164k·99.9% upNNovitafp8$0.27 in·$1.00 out·131k·100% upAAtlasCloudfp8$0.30 in·$0.95 out·131k·98.8% upCCoreWeavefp8$0.55 in·$1.65 out·161k·100% upMMara$0.60 in·$1.70 out·131k·96.9% upSSambaNovafp8$0.65 in·$1.50 out·131k·99.6% up
2 more hostsFewer hosts
SSiliconFlowfp8degraded$0.27 in·$1.00 out·164k·97.9% upGoogle Vertex AIdegraded$0.60 in·$1.70 out·164k·0% up
Qwen3.8 Flash1 host
HostInOutContextUptime
Alibaba Cloud$0.15 in·$0.47 out·1M·100% up

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

Research

What we learned reading every model

FAQ

Common questions

DeepSeek V3.1 is developed by DeepSeek while Qwen3.8 Flash is developed by Qwen. DeepSeek V3.1 has a 164K token context window vs Qwen3.8 Flash's 1.0M. You can compare their actual outputs across 8 challenges on Rival to see how they differ in practice.

It depends on your use case. DeepSeek V3.1 and Qwen3.8 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 8 challenges so you can judge which fits your needs best.

DeepSeek V3.1 costs $0.2/M input tokens and Qwen3.8 Flash costs $0.15/M input tokens. Qwen3.8 Flash is $0.05/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 V3.1 and Qwen3.8 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.

Keep exploring

More comparisons

Against the newest arrivals

DeepSeek V3.1 logoDeepSeek V4 Flash Vision Exp logo
DeepSeek V3.1 vs DeepSeek V4 Flash Vision ExpLanded Sep 2026
Qwen3.8 Flash logoSolar Pro 4 logo
Qwen3.8 Flash vs Solar Pro 4Landed Sep 2026
DeepSeek V3.1 logoHy3 logo
DeepSeek V3.1 vs Hy3Landed Sep 2026
Qwen3.8 Flash logoQwen3.7 Flash logo
Qwen3.8 Flash vs Qwen3.7 FlashLanded Sep 2026
DeepSeek V3.1 logoLing 3.0 Flash logo
DeepSeek V3.1 vs Ling 3.0 FlashLanded Sep 2026
Qwen3.8 Flash logoMuse Glimmer 30B logo
Qwen3.8 Flash vs Muse Glimmer 30BLanded Sep 2026
DeepSeek V3.1 logoGLM 5.3 logo
DeepSeek V3.1 vs GLM 5.3Landed Sep 2026
Qwen3.8 Flash logoTernary Bonsai 2 27B logo
Qwen3.8 Flash vs Ternary Bonsai 2 27BLanded Sep 2026

Same lab, same size, long tail

DeepSeek V3.1 logoDeepSeek V4.1 Flash logo
DeepSeek V3.1 vs DeepSeek V4.1 FlashSame lab
DeepSeek V3.1 logoDeepSeek V4 Pro 0813 logo
DeepSeek V3.1 vs DeepSeek V4 Pro 0813Version compare
Qwen3.8 Flash logoQwen3.8 Max (0902) logo
Qwen3.8 Flash vs Qwen3.8 Max (0902)Same lab
Qwen3.8 Flash logoQwen3.8 2.4T A95B logo
Qwen3.8 Flash vs Qwen3.8 2.4T A95BSame lab
Qwen3.8 Flash logoGPT-5 Pro logo
Qwen3.8 Flash vs GPT-5 ProNew provider
Qwen3.8 Flash logoGPT-5.1 logo
Qwen3.8 Flash vs GPT-5.1New provider
Qwen3.8 Flash logoGPT-5.1 Chat logo
Qwen3.8 Flash vs GPT-5.1 ChatSame size
Qwen3.8 Flash logoGPT-5.1-Codex logo
Qwen3.8 Flash vs GPT-5.1-CodexNew provider

Model pages

DeepSeek V3.1 logo
DeepSeek V3.154 outputs, specs and price
Qwen3.8 Flash logo
Qwen3.8 Flash8 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