What is the difference between DeepSeek V4 Pro and Llama 3.1 405B?

DeepSeek V4 Pro is developed by DeepSeek while Llama 3.1 405B is developed by Meta AI. DeepSeek V4 Pro has a 1.0M token context window vs Llama 3.1 405B's 128K. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

Which is better, DeepSeek V4 Pro or Llama 3.1 405B?

It depends on your use case. DeepSeek V4 Pro and Llama 3.1 405B each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

How much does DeepSeek V4 Pro cost compared to Llama 3.1 405B?

DeepSeek V4 Pro costs $1.74/M input tokens and Llama 3.1 405B costs $2.7/M input tokens. DeepSeek V4 Pro is $0.96/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 Pro and Llama 3.1 405B on Rival?

This page shows a side-by-side comparison of DeepSeek V4 Pro and Llama 3.1 405B 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 Apr 2026

DeepSeek V4 ProvsLlama 3.1 405B

DeepSeek V4 Pro is cheaper than Llama 3.1 405B at $1.74/M vs $2.7/M input tokens.

DeepSeek V4 Pro and Llama 3.1 405B compared across 12 shared prompts
Spec	DeepSeek V4 Pro	Llama 3.1 405B
Input price	$1.74/M tokens	$2.7/M tokens
Output price	$3.48/M tokens	$3.1/M tokens
Context window	1.0M tokens	128K tokens
Weights	Open	Open
Free API (OpenRouter)	No	No
Released	Apr 2026	Jul 2024

Our Verdict

DeepSeek V4 Pro

Llama 3.1 405BRunner-up

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

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

DeepSeek V4 Pro

Input

$1.74

1.6× cheaper

Output

$3.48

Llama 3.1 405B

Input

$2.70

Output

$3.10

1.1× cheaper

DeepSeek V4 Pro wins input (1.6× cheaper)·Llama 3.1 405B wins output (1.1× cheaper)

Where to run it

15 hosts, cheapest first

DeepSeek V4 Pro15 hosts

HostInOutContextUptime

StreamLakefp8$0.96 in$1.91 out1M99.3% up GMI Cloudfp8$0.96 in$1.91 out1M97.9% up DigitalOcean$1.04 in$2.09 out1M99.9% up Cloudflare Workers AI$1.15 in$2.55 out1M95.6% up DeepInfrafp8$1.30 in$2.60 out1M99.3% up Alibaba Cloudfp8$1.42 in$2.83 out1M100% up

9 more hosts

SiliconFlowfp8$1.50 in$3.13 out1M98% up Novitafp8$1.60 in$3.20 out1M99.8% up Venice$1.65 in$3.30 out1M95.5% up AtlasCloudfp4$1.68 in$3.38 out1M98.3% up Baidu Qianfanfp8$1.69 in$3.38 out1M99.2% up Basetenfp4$1.74 in$3.48 out1M99.3% up Parasailfp8$1.74 in$3.48 out1M99.5% up Azure AI Foundry$1.91 in$3.83 out1M98.8% up NextBitfp8$2.80 in$5.50 out1M99.9% up

Llama 3.1 405B

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Writing DNA

Style Comparison

Similarity

66%

DeepSeek V4 Pro uses 328.4x more bold

DeepSeek V4 Pro

Llama 3.1 405B

57%Vocabulary55%

18wSentence Length15w

0.52Hedging0.41

3.3Bold0.0

2.3Lists1.9

0.04Emoji0.03

0.45Headings0.00

0.15Transitions0.16

Based on 27 + 5 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Cost per 1M tokens

15 hosts, cheapest first

Style Comparison

What we learned reading every model

Common questions

What is the difference between DeepSeek V4 Pro and Llama 3.1 405B?

Which is better, DeepSeek V4 Pro or Llama 3.1 405B?

How much does DeepSeek V4 Pro cost compared to Llama 3.1 405B?

How can I compare DeepSeek V4 Pro and Llama 3.1 405B on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

15 hosts, cheapest first

Style Comparison

What we learned reading every model

Common questions

What is the difference between DeepSeek V4 Pro and Llama 3.1 405B?

Which is better, DeepSeek V4 Pro or Llama 3.1 405B?

How much does DeepSeek V4 Pro cost compared to Llama 3.1 405B?

How can I compare DeepSeek V4 Pro and Llama 3.1 405B on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages