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  5. Llama 3.1 405BvsMercury
Updated Jun 2025

Llama 3.1 405BvsMercury

Llama 3.1 405B is cheaper than Mercury at $2.7/M vs $10/M input tokens.

Llama 3.1 405B and Mercury compared across 12 shared prompts
SpecLlama 3.1 405BMercury
Input price$2.7/M tokens$10/M tokens
Output price$3.1/M tokens$10/M tokens
Context window128K tokens32K tokens
Parameters405BNot disclosed
WeightsOpen—
Free API (OpenRouter)NoNo
ReleasedJul 2024Jun 2025
HumanEval89.0%90.0%
Our Verdict
Llama 3.1 405B
Llama 3.1 405B
Mercury
MercuryRunner-up

Not enough votes to call it. On the specs, Llama 3.1 405B has the edge: bigger model tier, bigger context window, major provider backing.

Llama 3.1 405B costs 3.2x less per token.

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
3.7× cheaper
Output
$3.10
3.2× cheaper
Mercury
Input
$10.00
Output
$10.00

Llama 3.1 405B is cheaper on both: 3.7× input, 3.2× output.

Writing DNA

Style Comparison

Similarity
51%

Mercury uses 405.9x more bold

Llama 3.1 405B
Mercury
55%Vocabulary60%
15wSentence Length31w
0.41Hedging0.78
0.0Bold4.1
1.9Lists2.8
0.03Emoji0.03
0.00Headings0.88
0.16Transitions0.06
Based on 5 + 26 text responses
Research

What we learned reading every model

FAQ

Common questions

Llama 3.1 405B is developed by Meta AI while Mercury is developed by Inception. Llama 3.1 405B has a 128K token context window vs Mercury's 32K. 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 Mercury 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 Mercury costs $10/M input tokens. Llama 3.1 405B is $7.30/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 Mercury 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

Llama 3.1 405B logo
Llama 3.1 405B12 outputs, specs and price
Mercury logo
Mercury59 outputs, specs and price
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