What is the difference between DeepSeek V4.1 Flash and o1?

DeepSeek V4.1 Flash is developed by DeepSeek while o1 is developed by OpenAI. DeepSeek V4.1 Flash has a 1.0M token context window vs o1's 128K. 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 o1?

It depends on your use case. DeepSeek V4.1 Flash and o1 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 o1?

DeepSeek V4.1 Flash costs $0.15/M input tokens and o1 costs $15/M input tokens. DeepSeek V4.1 Flash is $14.85/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 o1 on Rival?

This page shows a side-by-side comparison of DeepSeek V4.1 Flash and o1 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 Flashvso1

DeepSeek V4.1 Flash is cheaper than o1 at $0.15/M vs $15/M input tokens.

DeepSeek V4.1 Flash and o1 compared across 6 shared prompts
Spec	DeepSeek V4.1 Flash	o1
Input price	$0.15/M tokens	$15/M tokens
Output price	$0.6/M tokens	$60/M tokens
Context window	1.0M tokens	128K tokens
Weights	Open	Closed
Free API (OpenRouter)	No	No
Released	Sep 2026	Dec 2024

Our Verdict

DeepSeek V4.1 Flash

o1Runner-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 100x less per token.

Slight edge

API pricing

Cost per 1M tokens

DeepSeek V4.1 Flash

Input

$0.15

100× cheaper

Output

$0.60

100× cheaper

Input

$15.00

Output

$60.00

DeepSeek V4.1 Flash is cheaper on both: 100× input, 100× output.

Where to run it

24 hosts, cheapest first

DeepSeek V4.1 Flash23 hosts

HostInOutContextUptime

Morph$0.12 in$0.48 out1M98.4% up Relacefp4$0.13 in$0.52 out1M99.9% up Sail Researchfp4$0.13 in$0.75 out1M99.9% 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

17 more hosts

StreamLakefp8$0.15 in$0.60 out1M99.5% up Wafer$0.20 in$0.60 out1M99.8% up CoreWeavefp8$0.20 in$0.65 out1M99.1% up OpenInferencefp4$0.20 in$0.80 out1M99.4% up Fireworks$0.22 in$0.66 out1M98.4% up Phala$0.28 in$1.10 out1M99.4% up GMI Cloudfp8$0.28 in$1.14 out1M99.7% up Novitafp8$0.28 in$1.14 out1M100% up AtlasCloudfp8$0.30 in$1.20 out1M99.8% up Basetenfp8$0.30 in$1.20 out1M98.2% up Makora$0.30 in$1.20 out1M98.7% up Modal$0.30 in$1.20 out1M99.8% up Parasailfp8$0.30 in$1.20 out1M93% up SiliconFlowfp8$0.30 in$1.20 out1M99.8% up Together$0.30 in$1.20 out1M100% up Venicefp8$0.38 in$1.50 out1M94.5% up DigitalOceandegraded$0.30 in$1.20 out1M98.1% up

o11 host

HostInOutContextUptime

OpenAI$15.00 in$60.00 out200k100% up

Per million tokens. Prices and uptime via OpenRouter, checked 22 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 o1?

Which is better, DeepSeek V4.1 Flash or o1?

How much does DeepSeek V4.1 Flash cost compared to o1?

How can I compare DeepSeek V4.1 Flash and o1 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

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 o1?

Which is better, DeepSeek V4.1 Flash or o1?

How much does DeepSeek V4.1 Flash cost compared to o1?

How can I compare DeepSeek V4.1 Flash and o1 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages