# GPT-4.5 Preview vs Llama 3.1 405B Instruct

As of Oct 15, 2026, GPT-4.5 Preview leads Llama 3.1 405B Instruct in 1 of 2 shared categories: Science.

GPT-4.5 Preview: price per 1M tokens is unset in the catalog.

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

GPT-4.5 Preview: closed weights.

Llama 3.1 405B Instruct: open weights.

- Which to pick, General LLM: As of Oct 15, 2026, Llama 3.1 405B Instruct leads GPT-4.5 Preview in General LLM at #5 against #79.
- Which to pick, Science: As of Oct 15, 2026, GPT-4.5 Preview leads Llama 3.1 405B Instruct in Science at #92 against #124.

As of Oct 15, 2026, GPT-4.5 Preview is a former state-of-the-art holder in General LLM (since Oct 17, 2025; sources LMArena Text (style-controlled, overall); methodology v1.0).

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).