Llama 3.1 405B vs o1
Compare Llama 3.1 405B by Meta AI against o1 by OpenAI, context windows of 128K vs 128K, tested across 12 shared challenges. Updated April 2026.
Which is better, Llama 3.1 405B or o1?
Llama 3.1 405B and o1 are both competitive models. Llama 3.1 405B costs $2.7/M input tokens vs $15/M for o1. Context windows: 128K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between Llama 3.1 405B and o1
Llama 3.1 405B is made by meta while o1 is from openai. Llama 3.1 405B has a 128K token context window compared to o1's 128K. On pricing, Llama 3.1 405B costs $2.7/M input tokens vs $15/M for o1.
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Llama 3.1 405B is 19x cheaper per token — worth considering if cost matters.
Style Comparison
o1 uses 503.7x more bold
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
