What is the difference between DeepSeek V4.1 Flash and Nemotron 3.5 Lightning?

DeepSeek V4.1 Flash is developed by DeepSeek while Nemotron 3.5 Lightning is developed by NVIDIA. DeepSeek V4.1 Flash has a 1.0M token context window vs Nemotron 3.5 Lightning'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 V4.1 Flash or Nemotron 3.5 Lightning?

It depends on your use case. DeepSeek V4.1 Flash and Nemotron 3.5 Lightning 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 Nemotron 3.5 Lightning?

DeepSeek V4.1 Flash costs $0.15/M input tokens and Nemotron 3.5 Lightning costs $0.08/M input tokens. Nemotron 3.5 Lightning is $0.07/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 Nemotron 3.5 Lightning on Rival?

This page shows a side-by-side comparison of DeepSeek V4.1 Flash and Nemotron 3.5 Lightning 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 FlashvsNemotron 3.5 Lightning

Nemotron 3.5 Lightning is cheaper than DeepSeek V4.1 Flash at $0.08/M vs $0.15/M input tokens.

DeepSeek V4.1 Flash and Nemotron 3.5 Lightning compared across 6 shared prompts
Spec	DeepSeek V4.1 Flash	Nemotron 3.5 Lightning
Input price	$0.15/M tokens	$0.08/M tokens
Output price	$0.6/M tokens	$0.2/M tokens
Context window	1.0M tokens	1.0M tokens
Weights	Open	Open
Free API (OpenRouter)	No	Yes (1 provider)
Released	Sep 2026	Aug 2026

Our Verdict

DeepSeek V4.1 Flash

Nemotron 3.5 LightningRunner-up

Not enough votes to call it. On the specs, DeepSeek V4.1 Flash has the edge: bigger model tier, major provider backing.

Too close to call

API pricing

Cost per 1M tokens

DeepSeek V4.1 Flash

Input

$0.15

Output

$0.60

Nemotron 3.5 Lightning

Input

$0.08

1.9× cheaper

Output

$0.20

3.0× cheaper

Nemotron 3.5 Lightning is cheaper on both: 1.9× input, 3.0× output.

Where to run it

27 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

Nemotron 3.5 Lightning4 hosts

HostInOutContextUptime

Darkbloomint4$0.07 in$0.18 out262k99.9% up CoreWeavebf16$0.07 in$0.20 out262k99.1% up Phala$0.07 in$0.20 out262k99.8% up DeepInfrabf16$0.08 in$0.20 out262k99.8% up

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

Research

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FAQ

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Cost per 1M tokens

27 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and Nemotron 3.5 Lightning?

Which is better, DeepSeek V4.1 Flash or Nemotron 3.5 Lightning?

How much does DeepSeek V4.1 Flash cost compared to Nemotron 3.5 Lightning?

How can I compare DeepSeek V4.1 Flash and Nemotron 3.5 Lightning on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

27 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and Nemotron 3.5 Lightning?

Which is better, DeepSeek V4.1 Flash or Nemotron 3.5 Lightning?

How much does DeepSeek V4.1 Flash cost compared to Nemotron 3.5 Lightning?

How can I compare DeepSeek V4.1 Flash and Nemotron 3.5 Lightning on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages