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  5. Llama 3.1 405BvsOpenAI o4-mini
Updated Apr 2025

Llama 3.1 405BvsOpenAI o4-mini

OpenAI o4-mini is cheaper than Llama 3.1 405B at $1.1/M vs $2.7/M input tokens.

Llama 3.1 405B and OpenAI o4-mini compared across 12 shared prompts
SpecLlama 3.1 405BOpenAI o4-mini
Input price$2.7/M tokens$1.1/M tokens
Output price$3.1/M tokens$4.4/M tokens
Context window128K tokens—
Parameters405BNot disclosed
WeightsOpenClosed
Free API (OpenRouter)NoNo
ReleasedJul 2024Apr 2025
Our Verdict
Llama 3.1 405B
Llama 3.1 405B
OpenAI o4-mini
OpenAI o4-mini

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

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Llama 3.1 405B
Input
$2.70
Output
$3.10
1.4× cheaper
OpenAI o4-mini
Input
$1.10
2.5× cheaper
Output
$4.40

OpenAI o4-mini wins input (2.5× cheaper)·Llama 3.1 405B wins output (1.4× cheaper)

Where to run it

1 host

Llama 3.1 405B

No hosts listed on OpenRouter.

OpenAI o4-mini1 host
HostInOutContextUptime
OpenAI$1.10 in·$4.40 out·200k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 26 Sep 2026.

Writing DNA

Style Comparison

Similarity
55%

Llama 3.1 405B uses 2.9x more emoji

Llama 3.1 405B
OpenAI o4-mini
55%Vocabulary73%
15wSentence Length21w
0.41Hedging0.39
0.0Bold0.0
1.9Lists2.0
0.03Emoji0.00
0.00Headings0.00
0.16Transitions0.05
Based on 5 + 17 text responses
Research

What we learned reading every model

FAQ

Common questions

Llama 3.1 405B is developed by Meta AI while OpenAI o4-mini is developed by OpenAI. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

It depends on your use case. Llama 3.1 405B and OpenAI o4-mini 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.

Llama 3.1 405B costs $2.7/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. OpenAI o4-mini is $1.60/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of Llama 3.1 405B and OpenAI o4-mini 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.

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Model pages

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Llama 3.1 405B12 outputs, specs and price
OpenAI o4-mini logo
OpenAI o4-mini59 outputs, specs and price
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