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

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

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

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

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

GPT-6 Luna 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 compared across 6 shared prompts
Spec	DeepSeek V4.1 Flash	GPT-6 Luna
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

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

Input

$0.10

1.5× cheaper

Output

$0.50

1.2× cheaper

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

Where to run it

29 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 Luna3 hosts

HostInOutContextUptime

Azure AI Foundry$0.10 in$0.50 out1.1M88.4% up OpenAI$0.10 in$0.50 out1.1M99.9% up Amazon Bedrock$0.11 in$0.55 out1.1M99.8% up

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

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Cost per 1M tokens

29 hosts, cheapest first

What we learned reading every model

Common questions

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

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

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

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

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

29 hosts, cheapest first

What we learned reading every model

Common questions

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

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

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

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

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages