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

Both are developed by DeepSeek but target different use cases. DeepSeek V4 Pro 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 Pro or DeepSeek V4.1 Flash?

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

DeepSeek V4 Pro costs $1.74/M input tokens and DeepSeek V4.1 Flash costs $0.15/M input tokens. DeepSeek V4.1 Flash is $1.59/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 Pro and DeepSeek V4.1 Flash on Rival?

This page shows a side-by-side comparison of DeepSeek V4 Pro 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 ProvsDeepSeek V4.1 Flash

DeepSeek V4.1 Flash is cheaper than DeepSeek V4 Pro at $0.15/M vs $1.74/M input tokens.

DeepSeek V4 Pro and DeepSeek V4.1 Flash compared across 6 shared prompts
Spec	DeepSeek V4 Pro	DeepSeek V4.1 Flash
Input price	$1.74/M tokens	$0.15/M tokens
Output price	$3.48/M tokens	$0.6/M tokens
Context window	1.0M tokens	1.0M tokens
Weights	Open	Open
Free API (OpenRouter)	No	No
Released	Apr 2026	Sep 2026

Our Verdict

DeepSeek V4 Pro

DeepSeek V4.1 Flash

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

DeepSeek V4.1 Flash costs 5.8x less per token.

Too close to call

API pricing

Cost per 1M tokens

DeepSeek V4 Pro

Input

$1.74

Output

$3.48

DeepSeek V4.1 Flash

Input

$0.15

12× cheaper

Output

$0.60

5.8× cheaper

DeepSeek V4.1 Flash is cheaper on both: 12× input, 5.8× output.

Where to run it

38 hosts, cheapest first

DeepSeek V4 Pro15 hosts

HostInOutContextUptime

StreamLakefp8$0.96 in$1.91 out1M99% up GMI Cloudfp8$0.96 in$1.91 out1M99.8% up DigitalOcean$1.04 in$2.09 out1M100% up DeepInfrafp8$1.30 in$2.60 out1M99.2% up Alibaba Cloudfp8$1.42 in$2.83 out1M100% up SiliconFlowfp8$1.50 in$3.13 out1M99.4% up

9 more hosts

Novitafp8$1.60 in$3.20 out1M100% up Venice$1.65 in$3.30 out1M97.9% up AtlasCloudfp4$1.68 in$3.38 out1M99.8% up Baidu Qianfanfp8$1.69 in$3.38 out1M99.9% up Basetenfp4$1.74 in$3.48 out1M99.6% up NextBitfp8$1.74 in$3.48 out1M97.6% up Parasailfp8$1.74 in$3.48 out1M99% up Azure AI Foundry$1.91 in$3.83 out1M95.5% up Cloudflare Workers AIdegraded$1.15 in$2.55 out1M94.2% up

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

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

38 hosts, cheapest first

What we learned reading every model

Common questions

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

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

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

How can I compare DeepSeek V4 Pro 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

38 hosts, cheapest first

What we learned reading every model

Common questions

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

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

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

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

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages