o1 vs Llama 3.1 405B

Compare o1 by OpenAI against Llama 3.1 405B by Meta AI, context windows of 128K vs 128K, tested across 4 shared challenges. Updated March 2026.

Which is better, o1 or Llama 3.1 405B?

o1 and Llama 3.1 405B are both competitive models. o1 costs $15/M input tokens vs $2.7/M for Llama 3.1 405B. Context windows: 128K vs 128K tokens. Compare their real outputs side by side below.

Key Differences Between o1 and Llama 3.1 405B

o1 is made by openai while Llama 3.1 405B is from meta. o1 has a 128K token context window compared to Llama 3.1 405B's 128K. On pricing, o1 costs $15/M input tokens vs $2.7/M for Llama 3.1 405B.

Our Verdict
o1
o1
Llama 3.1 405B
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.

Llama 3.1 405B is 19x cheaper per token — worth considering if cost matters.

Too close to call

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