What is the difference between DeepSeek V4 Flash 0731 and DeepSeek V4.1 Flash?

Both are developed by DeepSeek but target different use cases. DeepSeek V4 Flash 0731 has a 1.0M token context window vs DeepSeek V4.1 Flash's 1.0M. You can compare their actual outputs across 6 challenges on Rival to see how they differ in practice.

Which is better, DeepSeek V4 Flash 0731 or DeepSeek V4.1 Flash?

It depends on your use case. DeepSeek V4 Flash 0731 and DeepSeek V4.1 Flash 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 Flash 0731 cost compared to DeepSeek V4.1 Flash?

DeepSeek V4 Flash 0731 costs $0.14/M input tokens and DeepSeek V4.1 Flash costs $0.15/M input tokens. DeepSeek V4 Flash 0731 is $0.01/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 Flash 0731 and DeepSeek V4.1 Flash on Rival?

This page shows a side-by-side comparison of DeepSeek V4 Flash 0731 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.

Updated Sep 2026

DeepSeek V4 Flash 0731vsDeepSeek V4.1 Flash

DeepSeek V4 Flash 0731 is cheaper than DeepSeek V4.1 Flash at $0.14/M vs $0.15/M input tokens.

DeepSeek V4 Flash 0731 and DeepSeek V4.1 Flash compared across 6 shared prompts
Spec	DeepSeek V4 Flash 0731	DeepSeek V4.1 Flash
Input price	$0.14/M tokens	$0.15/M tokens
Output price	$0.28/M tokens	$0.6/M tokens
Context window	1.0M tokens	1.0M tokens
Weights	Open	Open
Free API (OpenRouter)	No	No
Released	Jul 2026	Sep 2026

Our Verdict

DeepSeek V4 Flash 0731

DeepSeek V4.1 Flash

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

Too close to call

API pricing

Cost per 1M tokens

DeepSeek V4 Flash 0731

Input

$0.14

1.1× cheaper

Output

$0.28

2.1× cheaper

DeepSeek V4.1 Flash

Input

$0.15

Output

$0.60

DeepSeek V4 Flash 0731 is cheaper on both: 1.1× input, 2.1× output.

Where to run it

50 hosts, cheapest first

DeepSeek V4 Flash 073128 hosts

HostInOutContextUptime

OpenInferencefp8$0.03 in$1.00 out1M99.7% up Sail Researchfp4$0.04 in$0.55 out1M99.7% up Relacefp4$0.04 in$0.64 out1M99.7% up StreamLakefp8$0.05 in$0.16 out1M97.2% up DeepInfrafp8$0.06 in$0.18 out1M99.7% up Rekafp4$0.09 in$0.53 out262k98.8% up

22 more hosts

Makora$0.09 in$0.20 out1M97.3% up Wafer$0.10 in$0.25 out1M99.9% up DigitalOcean$0.12 in$0.24 out1M99.7% up Inceptronfp4$0.12 in$0.50 out1M99.5% up Basetenfp8$0.13 in$0.26 out1M100% up CoreWeavefp8$0.13 in$0.28 out262k100% up Parasailfp8$0.14 in$0.28 out1M99.7% up Together$0.14 in$0.28 out1M99.7% up Morph$0.14 in$0.40 out1M94.6% up Venice$0.17 in$0.35 out1M99% up Alibaba Cloud$0.18 in$0.53 out1M100% up Mancerfp8$0.20 in$0.60 out1M98.9% up Fireworks$0.22 in$0.66 out1M95.7% up SiliconFlowfp8$0.22 in$0.66 out1M98.1% up GMI Cloudfp8$0.29 in$0.86 out1M99.9% up NextBitfp8$0.35 in$1.06 out1M98.3% up Novitafp8$0.41 in$1.23 out1M100% up AtlasCloudfp4$0.44 in$1.32 out1M99.7% up Baidu Qianfanfp8$0.44 in$1.32 out1M96.6% up Cloudflare Workers AI$0.44 in$1.32 out1.3M100% up Phala$0.44 in$1.32 out1M99.8% up Nebiusfp8degraded$0.14 in$0.28 out1M22.4% up

DeepSeek V4.1 Flash22 hosts

HostInOutContextUptime

Morph$0.12 in$0.48 out1M97.8% up Relacefp4$0.13 in$0.52 out1M99.8% up DeepInfrafp8$0.14 in$0.42 out1M99.7% up Alibaba Cloud$0.15 in$0.60 out1M99.9% up DeepSeek$0.15 in$0.60 out1M100% up StreamLakefp8$0.15 in$0.60 out1M99.4% up

16 more hosts

Sail Researchfp4$0.20 in$0.60 out1M99.9% up Wafer$0.20 in$0.60 out1M99.8% up CoreWeavefp8$0.20 in$0.65 out1M99.5% up Fireworks$0.22 in$0.66 out1M98.2% up Phala$0.28 in$1.10 out1M99.3% up GMI Cloudfp8$0.28 in$1.14 out1M98.8% up Novitafp8$0.28 in$1.14 out1M100% up AtlasCloudfp8$0.30 in$1.20 out1M99.4% up Basetenfp8$0.30 in$1.20 out1M98.5% up DigitalOcean$0.30 in$1.20 out1M98.1% up Makora$0.30 in$1.20 out1M98.3% up Modal$0.30 in$1.20 out1M99.9% up SiliconFlowfp8$0.30 in$1.20 out1M99.7% up Together$0.30 in$1.20 out1M99.9% up Venicefp8$0.38 in$1.50 out1M97% up Parasailfp8degraded$0.30 in$1.20 out1M92.4% up

Per million tokens. Prices and uptime via OpenRouter, checked 22 Sep 2026.

Research

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Cost per 1M tokens

50 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4 Flash 0731 and DeepSeek V4.1 Flash?

Which is better, DeepSeek V4 Flash 0731 or DeepSeek V4.1 Flash?

How much does DeepSeek V4 Flash 0731 cost compared to DeepSeek V4.1 Flash?

How can I compare DeepSeek V4 Flash 0731 and DeepSeek V4.1 Flash on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

50 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4 Flash 0731 and DeepSeek V4.1 Flash?

Which is better, DeepSeek V4 Flash 0731 or DeepSeek V4.1 Flash?

How much does DeepSeek V4 Flash 0731 cost compared to DeepSeek V4.1 Flash?

How can I compare DeepSeek V4 Flash 0731 and DeepSeek V4.1 Flash on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages