What is the difference between DeepSeek V4.1 Flash and GPT-6 Luna Pro?

DeepSeek V4.1 Flash is developed by DeepSeek while GPT-6 Luna Pro is developed by OpenAI. DeepSeek V4.1 Flash has a 1.0M token context window vs GPT-6 Luna Pro's 1.1M. 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-6 Luna Pro?

It depends on your use case. DeepSeek V4.1 Flash and GPT-6 Luna Pro 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 GPT-6 Luna Pro?

DeepSeek V4.1 Flash costs $0.15/M input tokens and GPT-6 Luna Pro costs $0.1/M input tokens. GPT-6 Luna Pro is $0.05/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 GPT-6 Luna Pro on Rival?

This page shows a side-by-side comparison of DeepSeek V4.1 Flash and GPT-6 Luna Pro 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-6 Luna Pro

GPT-6 Luna Pro is cheaper than DeepSeek V4.1 Flash at $0.1/M vs $0.15/M input tokens.

DeepSeek V4.1 Flash and GPT-6 Luna Pro compared across 6 shared prompts
Spec	DeepSeek V4.1 Flash	GPT-6 Luna Pro
Input price	$0.15/M tokens	$0.1/M tokens
Output price	$0.6/M tokens	$0.5/M tokens
Context window	1.0M tokens	1.1M tokens
Weights	Open	Closed
Free API (OpenRouter)	No	No
Released	Sep 2026	Sep 2026

Our Verdict

DeepSeek V4.1 Flash

GPT-6 Luna Pro

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

Too close to call

API pricing

Cost per 1M tokens

DeepSeek V4.1 Flash

Input

$0.15

Output

$0.60

GPT-6 Luna Pro

Input

$0.10

1.5× cheaper

Output

$0.50

1.2× cheaper

GPT-6 Luna Pro is cheaper on both: 1.5× input, 1.2× output.

Where to run it

28 hosts, cheapest first

DeepSeek V4.1 Flash26 hosts

HostInOutContextUptime

DekaLLM$0.04 in$0.49 out1M99.4% up Morph$0.07 in$0.30 out1M100% up OpenInferencefp4$0.10 in$0.50 out1M99.4% up Relace$0.10 in$0.50 out1M99.9% up Sail Researchfp4$0.13 in$0.75 out1M99.1% up DeepInfrafp8$0.14 in$0.42 out1M99.9% up

20 more hosts

GPT-6 Luna Pro2 hosts

HostInOutContextUptime

Azure AI Foundry$0.10 in$0.50 out1.1M98.6% up OpenAI$0.10 in$0.50 out1.1M99.9% up

Per million tokens. Prices and uptime via OpenRouter, checked 25 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

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More comparisons

Cost per 1M tokens

28 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and GPT-6 Luna Pro?

Which is better, DeepSeek V4.1 Flash or GPT-6 Luna Pro?

How much does DeepSeek V4.1 Flash cost compared to GPT-6 Luna Pro?

How can I compare DeepSeek V4.1 Flash and GPT-6 Luna Pro on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

28 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and GPT-6 Luna Pro?

Which is better, DeepSeek V4.1 Flash or GPT-6 Luna Pro?

How much does DeepSeek V4.1 Flash cost compared to GPT-6 Luna Pro?

How can I compare DeepSeek V4.1 Flash and GPT-6 Luna Pro on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages