Llama 3.1 405B vs OpenAI o4-mini
Compare Llama 3.1 405B by Meta AI against OpenAI o4-mini by OpenAI, tested across 12 shared challenges. Updated May 2026.
Which is better, Llama 3.1 405B or OpenAI o4-mini?
Llama 3.1 405B and OpenAI o4-mini are both competitive models. Llama 3.1 405B costs $2.7/M input tokens vs $1.1/M for OpenAI o4-mini. Compare their real outputs side by side below.
Key Differences Between Llama 3.1 405B and OpenAI o4-mini
Llama 3.1 405B is made by meta while OpenAI o4-mini is from openai. On pricing, Llama 3.1 405B costs $2.7/M input tokens vs $1.1/M for OpenAI o4-mini.
API pricing
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)
Our Verdict
Llama 3.1 405B
OpenAI o4-mini
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
Writing DNA
Style Comparison
Similarity
59%
Llama 3.1 405B uses 2.9x more emoji
Llama 3.1 405B
OpenAI o4-mini
56%Vocabulary73%
15wSentence Length15w
0.41Hedging0.18
0.0Bold0.0
1.9Lists2.1
0.03Emoji0.00
0.00Headings0.00
0.16Transitions0.02
Based on 5 + 10 text responses
FAQ
