What is the difference between DeepSeek V4.1 Flash and GPT-5 Nano?

DeepSeek V4.1 Flash is developed by DeepSeek while GPT-5 Nano 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 GPT-5 Nano?

It depends on your use case. DeepSeek V4.1 Flash and GPT-5 Nano 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 can I compare DeepSeek V4.1 Flash and GPT-5 Nano on Rival?

This page shows a side-by-side comparison of DeepSeek V4.1 Flash and GPT-5 Nano 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 FlashvsGPT-5 Nano

DeepSeek V4.1 Flash is the newer model, released after GPT-5 Nano.

DeepSeek V4.1 Flash and GPT-5 Nano compared across 6 shared prompts
Spec	DeepSeek V4.1 Flash	GPT-5 Nano
Input price	$0.15/M tokens	—
Output price	$0.6/M tokens	—
Context window	1.0M tokens	—
Weights	Open	Closed
Free API (OpenRouter)	No	No
Released	Sep 2026	Aug 2025

Our Verdict

DeepSeek V4.1 Flash

GPT-5 NanoRunner-up

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

Too close to call

API pricing

Cost per 1M tokens

DeepSeek V4.1 Flash

Input

$0.15

Output

$0.60

GPT-5 Nano

Input

—

Output

—

Where to run it

25 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

GPT-5 Nano2 hosts

HostInOutContextUptime

Azure AI Foundry$0.05 in$0.40 out400k99.9% up OpenAI$0.05 in$0.40 out400k100% 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

25 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and GPT-5 Nano?

Which is better, DeepSeek V4.1 Flash or GPT-5 Nano?

How can I compare DeepSeek V4.1 Flash and GPT-5 Nano on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

25 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and GPT-5 Nano?

Which is better, DeepSeek V4.1 Flash or GPT-5 Nano?

How can I compare DeepSeek V4.1 Flash and GPT-5 Nano on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages