What is the difference between Grok 4.5 and Llama 3.1 405B?

Grok 4.5 is developed by xAI while Llama 3.1 405B is developed by Meta AI. Grok 4.5 has a 500K 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, Grok 4.5 or Llama 3.1 405B?

It depends on your use case. Grok 4.5 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 Grok 4.5 cost compared to Llama 3.1 405B?

Grok 4.5 costs $2/M input tokens and Llama 3.1 405B costs $2.7/M input tokens. Grok 4.5 is $0.70/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 Grok 4.5 and Llama 3.1 405B on Rival?

This page shows a side-by-side comparison of Grok 4.5 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.

What is the difference between Grok 4.5 and Llama 3.1 405B?

Grok 4.5 is developed by xAI while Llama 3.1 405B is developed by Meta AI. Grok 4.5 has a 500K 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, Grok 4.5 or Llama 3.1 405B?

It depends on your use case. Grok 4.5 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 Grok 4.5 cost compared to Llama 3.1 405B?

Grok 4.5 costs $2/M input tokens and Llama 3.1 405B costs $2.7/M input tokens. Grok 4.5 is $0.70/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 Grok 4.5 and Llama 3.1 405B on Rival?

This page shows a side-by-side comparison of Grok 4.5 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.

Grok 4.5 vs Llama 3.1 405B: Which Is Better?

Updated Jul 2026

Our Verdict

Grok 4.5

Llama 3.1 405B

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call

What do Grok 4.5 and Llama 3.1 405B say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Grok 4.5

Input

$2.00

1.4× cheaper

Output

$6.00

Llama 3.1 405B

Input

$2.70

Output

$3.10

1.9× cheaper

Grok 4.5 wins input (1.4× cheaper)·Llama 3.1 405B wins output (1.9× cheaper)

Writing DNA

Style Comparison

Similarity

58%

Grok 4.5 uses 245.4x more bold

Grok 4.5

Llama 3.1 405B

61%Vocabulary56%

16wSentence Length15w

0.23Hedging0.41

2.5Bold0.0

2.4Lists1.9

0.09Emoji0.03

0.48Headings0.00

0.06Transitions0.16

Based on 27 + 5 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Grok 4.5 vs MiniMax M3New provider

Grok 4.5 vs Ox AlphaNew provider

Grok 4.5 vs OpenAI o3New provider

Updated Jul 2026

Our Verdict

Grok 4.5

Llama 3.1 405B

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call

What do Grok 4.5 and Llama 3.1 405B say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Grok 4.5

Input

$2.00

1.4× cheaper

Output

$6.00

Llama 3.1 405B

Input

$2.70

Output

$3.10

1.9× cheaper

Grok 4.5 wins input (1.4× cheaper)·Llama 3.1 405B wins output (1.9× cheaper)

Writing DNA

Style Comparison

Similarity

58%

Grok 4.5 uses 245.4x more bold

Grok 4.5

Llama 3.1 405B

61%Vocabulary56%

16wSentence Length15w

0.23Hedging0.41

2.5Bold0.0

2.4Lists1.9

0.09Emoji0.03

0.48Headings0.00

0.06Transitions0.16

Based on 27 + 5 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Grok 4.5 vs MiniMax M3New provider

Grok 4.5 vs Ox AlphaNew provider

Grok 4.5 vs OpenAI o3New provider