Llama 3.1 405B vs o3 Mini
Compare Llama 3.1 405B by Meta AI against o3 Mini by OpenAI, context windows of 128K vs 64K, tested across 12 shared challenges. Updated April 2026.
Which is better, Llama 3.1 405B or o3 Mini?
Llama 3.1 405B and o3 Mini are both competitive models. Llama 3.1 405B costs $2.7/M input tokens vs $1.1/M for o3 Mini. Context windows: 128K vs 64K tokens. Compare their real outputs side by side below.
Key Differences Between Llama 3.1 405B and o3 Mini
Llama 3.1 405B is made by meta while o3 Mini is from openai. Llama 3.1 405B has a 128K token context window compared to o3 Mini's 64K. On pricing, Llama 3.1 405B costs $2.7/M input tokens vs $1.1/M for o3 Mini.
No community votes yet. On paper, Llama 3.1 405B has the edge — bigger model tier, bigger context window.
Style Comparison
o3 Mini uses 390.2x 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.
