# Claude Sonnet 5.5 vs Llama 3.1 405B Instruct

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

Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.

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

Claude Sonnet 5.5: 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 Claude Sonnet 5.5 in General LLM at #3 against #27.
- Which to pick, Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads Llama 3.1 405B Instruct in Science at #3 against #124.

As of Oct 14, 2026, Claude Sonnet 5.5 is tied for state of the art in Coding (since Oct 6, 2026; sources Terminal-Bench 4.0; 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).