# GPT-5.5 Instant vs Llama 3.1 405B Instruct

As of Oct 14, 2026, GPT-5.5 Instant leads Llama 3.1 405B Instruct in 1 of 2 shared categories: Science.

GPT-5.5 Instant: price per 1M tokens is unset in the catalog.

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

GPT-5.5 Instant: closed weights.

Llama 3.1 405B Instruct: open weights.

- Which to pick, General LLM: As of Oct 14, 2026, Llama 3.1 405B Instruct leads GPT-5.5 Instant in General LLM at #3 against #31.
- Which to pick, Science: As of Oct 14, 2026, GPT-5.5 Instant leads Llama 3.1 405B Instruct in Science at #65 against #124.

As of Oct 14, 2026, GPT-5.5 Instant is ranked #31 in General LLM (since Oct 14, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).

As of Oct 14, 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).