Llama 4 (405B) vs o1-preview
Head-to-head technical comparison of intelligence, capabilities, and API pricing.
Llama 4 (405B)
Meta
AI Mastery Index90.5
LMSYS Arena1285
Technical (MMLU-Pro)90.5%
Cost per 1M Tokens$0
o1-preview
OpenAI
AI Mastery Index88.5
LMSYS Arena1335
Technical (MMLU-Pro)90.8%
Cost per 1M Tokens$15
Architect's Verdict
When comparing Llama 4 (405B) and o1-preview, Llama 4 (405B) edges out in overall capabilities according to the AI Mastery Index. However, for cost-sensitive workloads, Llama 4 (405B) offers a more economical API at $0 per 1M tokens. Your choice should depend heavily on whether you prioritize raw reasoning (MMLU) or scalable deployment economics.