What is the difference between DeepSeek V4.1 Flash and Grok 4.1 Fast?

DeepSeek V4.1 Flash is developed by DeepSeek while Grok 4.1 Fast is developed by xAI. 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 Grok 4.1 Fast?

It depends on your use case. DeepSeek V4.1 Flash and Grok 4.1 Fast 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 Grok 4.1 Fast on Rival?

This page shows a side-by-side comparison of DeepSeek V4.1 Flash and Grok 4.1 Fast 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 FlashvsGrok 4.1 Fast

DeepSeek V4.1 Flash is the newer model, released after Grok 4.1 Fast.

DeepSeek V4.1 Flash and Grok 4.1 Fast compared across 6 shared prompts
Spec	DeepSeek V4.1 Flash	Grok 4.1 Fast
Input price	$0.15/M tokens	—
Output price	$0.6/M tokens	—
Context window	1.0M tokens	—
Weights	Open	—
Free API (OpenRouter)	No	No
Released	Sep 2026	Nov 2025

Our Verdict

DeepSeek V4.1 Flash

Grok 4.1 Fast

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

Grok 4.1 Fast

Input

—

Output

—

Where to run it

23 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

Grok 4.1 Fast

No hosts listed on OpenRouter.

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

Research

What we learned reading every model

FAQ

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More comparisons

Cost per 1M tokens

23 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and Grok 4.1 Fast?

Which is better, DeepSeek V4.1 Flash or Grok 4.1 Fast?

How can I compare DeepSeek V4.1 Flash and Grok 4.1 Fast on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

23 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between DeepSeek V4.1 Flash and Grok 4.1 Fast?

Which is better, DeepSeek V4.1 Flash or Grok 4.1 Fast?

How can I compare DeepSeek V4.1 Flash and Grok 4.1 Fast on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages