What is the difference between DeepSeek V4.1 Flash and Qwen3.5 397B A17B?

DeepSeek V4.1 Flash is developed by DeepSeek while Qwen3.5 397B A17B is developed by Qwen. DeepSeek V4.1 Flash has a 1.0M token context window vs Qwen3.5 397B A17B's 262K. You can compare their actual outputs across 6 challenges on Rival to see how they differ in practice.

Which is better, DeepSeek V4.1 Flash or Qwen3.5 397B A17B?

It depends on your use case. DeepSeek V4.1 Flash and Qwen3.5 397B A17B each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 6 challenges so you can judge which fits your needs best.

How much does DeepSeek V4.1 Flash cost compared to Qwen3.5 397B A17B?

DeepSeek V4.1 Flash costs $0.15/M input tokens and Qwen3.5 397B A17B costs $0.6/M input tokens. DeepSeek V4.1 Flash is $0.45/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 DeepSeek V4.1 Flash and Qwen3.5 397B A17B on Rival?

This page shows a side-by-side comparison of DeepSeek V4.1 Flash and Qwen3.5 397B A17B 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.

Updated Sep 2026

DeepSeek V4.1 FlashvsQwen3.5 397B A17B

DeepSeek V4.1 Flash is cheaper than Qwen3.5 397B A17B at $0.15/M vs $0.6/M input tokens.

DeepSeek V4.1 Flash and Qwen3.5 397B A17B compared across 6 shared prompts
Spec	DeepSeek V4.1 Flash	Qwen3.5 397B A17B
Input price	$0.15/M tokens	$0.6/M tokens
Output price	$0.6/M tokens	$3.6/M tokens
Context window	1.0M tokens	262K tokens
Weights	Open	Open
Free API (OpenRouter)	No	No
Released	Sep 2026	Feb 2026

Our Verdict

DeepSeek V4.1 Flash

Qwen3.5 397B A17B

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

DeepSeek V4.1 Flash costs 6.0x less per token.

Too close to call

API pricing

Cost per 1M tokens

DeepSeek V4.1 Flash

Input

$0.15

4.0× cheaper

Output

$0.60

6.0× cheaper

Qwen3.5 397B A17B

Input

$0.60

Output

$3.60

DeepSeek V4.1 Flash is cheaper on both: 4.0× input, 6.0× output.

Where to run it

33 hosts, cheapest first

DeepSeek V4.1 Flash23 hosts

HostInOutContextUptime

OpenInferencefp4$0.10 in$0.50 out1M99.5% up Wafer$0.12 in$0.60 out1M99.7% up Relacefp4$0.12 in$0.52 out1M99.9% up Morph$0.13 in$0.51 out1M98.4% up Sail Researchfp4$0.13 in$0.75 out1M99.9% up DeepInfrafp8$0.14 in$0.42 out1M99.7% up

17 more hosts

StreamLakefp8$0.15 in$0.60 out1M99.5% up CoreWeavefp8$0.20 in$0.65 out1M99.2% up Fireworks$0.22 in$0.66 out1M98.8% up Phala$0.28 in$1.10 out1M99.4% up GMI Cloudfp8$0.28 in$1.14 out1M99.6% up Novitafp8$0.28 in$1.14 out1M100% up Alibaba Cloud$0.30 in$1.20 out1M99.9% up AtlasCloudfp8$0.30 in$1.20 out1M99.7% up Basetenfp8$0.30 in$1.20 out1M99.4% up DeepSeek$0.30 in$1.20 out1M100% up DigitalOcean$0.30 in$1.20 out1M97.9% up Makora$0.30 in$1.20 out1M98.9% up Modal$0.30 in$1.20 out1M99.8% up SiliconFlowfp8$0.30 in$1.20 out1M99.8% up Together$0.30 in$1.20 out1M99.9% up Venicefp8$0.38 in$1.50 out1M96.7% up Parasailfp8degraded$0.30 in$1.20 out1M93% up

Qwen3.5 397B A17B10 hosts

HostInOutContextUptime

Alibaba Cloud$0.39 in$2.34 out262k99.9% up DeepInfrafp8$0.45 in$3.00 out262k97% up Parasailfp8$0.50 in$3.60 out262k99.2% up AtlasCloudfp8$0.55 in$3.50 out262k96% up DigitalOcean$0.55 in$3.50 out131k90.3% up Phala$0.55 in$3.50 out262k98.7% up

4 more hosts

GMI Cloudfp8$0.60 in$3.60 out262k83.5% up Novita$0.60 in$3.60 out262k97.4% up StreamLake$0.60 in$3.60 out256k97.4% up Venice$0.75 in$4.50 out128k73.2% up

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

Research

What we learned reading every model

FAQ

Common questions

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More comparisons

Cost per 1M tokens

33 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and Qwen3.5 397B A17B?

Which is better, DeepSeek V4.1 Flash or Qwen3.5 397B A17B?

How much does DeepSeek V4.1 Flash cost compared to Qwen3.5 397B A17B?

How can I compare DeepSeek V4.1 Flash and Qwen3.5 397B A17B on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

33 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and Qwen3.5 397B A17B?

Which is better, DeepSeek V4.1 Flash or Qwen3.5 397B A17B?

How much does DeepSeek V4.1 Flash cost compared to Qwen3.5 397B A17B?

How can I compare DeepSeek V4.1 Flash and Qwen3.5 397B A17B on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages