# Llama 3.1 405B Instruct vs O3

As of Oct 15, 2026, Llama 3.1 405B Instruct leads O3 in 1 of 2 shared categories: General LLM.

Llama 3.1 405B Instruct: price per 1M tokens is unset in the catalog.

O3: $3.5 per 1M blended tokens.

Llama 3.1 405B Instruct: open weights.

O3: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Llama 3.1 405B Instruct leads O3 in General LLM at #5 against #100.
- Which to pick, Science: As of Oct 15, 2026, O3 leads Llama 3.1 405B Instruct in Science at #67 against #124.

As of Oct 15, 2026, Llama 3.1 405B Instruct is a former state-of-the-art holder in General LLM (since Aug 28, 2024; sources LMArena Text (style-controlled, overall); methodology v1.0).

As of Oct 15, 2026, O3 is a former state-of-the-art holder in General LLM (since Jul 28, 2025; sources LMArena Text (style-controlled, overall); methodology v1.0).