What is the difference between DeepSeek V4.1 Flash and OpenAI o4-mini?

DeepSeek V4.1 Flash is developed by DeepSeek while OpenAI o4-mini is developed by OpenAI. 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 OpenAI o4-mini?

It depends on your use case. DeepSeek V4.1 Flash and OpenAI o4-mini 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 OpenAI o4-mini?

DeepSeek V4.1 Flash costs $0.15/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. DeepSeek V4.1 Flash is $0.95/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 OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of DeepSeek V4.1 Flash and OpenAI o4-mini 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 FlashvsOpenAI o4-mini

DeepSeek V4.1 Flash is cheaper than OpenAI o4-mini at $0.15/M vs $1.1/M input tokens.

DeepSeek V4.1 Flash and OpenAI o4-mini compared across 6 shared prompts
Spec	DeepSeek V4.1 Flash	OpenAI o4-mini
Input price	$0.15/M tokens	$1.1/M tokens
Output price	$0.6/M tokens	$4.4/M tokens
Context window	1.0M tokens	—
Weights	Open	Closed
Free API (OpenRouter)	No	No
Released	Sep 2026	Apr 2025

Our Verdict

DeepSeek V4.1 Flash

OpenAI o4-miniRunner-up

Not enough votes to call it. On the specs, DeepSeek V4.1 Flash has the edge: bigger model tier, newer, bigger context window.

DeepSeek V4.1 Flash costs 7.3x less per token.

Too close to call

API pricing

Cost per 1M tokens

DeepSeek V4.1 Flash

Input

$0.15

7.3× cheaper

Output

$0.60

7.3× cheaper

OpenAI o4-mini

Input

$1.10

Output

$4.40

DeepSeek V4.1 Flash is cheaper on both: 7.3× input, 7.3× output.

Where to run it

24 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

OpenAI o4-mini1 host

HostInOutContextUptime

OpenAI$1.10 in$4.40 out200k100% 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

24 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and OpenAI o4-mini?

Which is better, DeepSeek V4.1 Flash or OpenAI o4-mini?

How much does DeepSeek V4.1 Flash cost compared to OpenAI o4-mini?

How can I compare DeepSeek V4.1 Flash and OpenAI o4-mini on Rival?

More comparisons

Against the newest arrivals

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Model pages

Cost per 1M tokens

24 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and OpenAI o4-mini?

Which is better, DeepSeek V4.1 Flash or OpenAI o4-mini?

How much does DeepSeek V4.1 Flash cost compared to OpenAI o4-mini?

How can I compare DeepSeek V4.1 Flash and OpenAI o4-mini on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages