# DeepSeek V4.1 Flash vs Llama 3.1 405B Instruct

As of Oct 15, 2026, DeepSeek V4.1 Flash leads Llama 3.1 405B Instruct in 1 of 2 shared categories: Science.

DeepSeek V4.1 Flash: $0.23463 per 1M blended tokens.

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

DeepSeek V4.1 Flash: open weights.

Llama 3.1 405B Instruct: open weights.

- Which to pick, General LLM: As of Oct 15, 2026, Llama 3.1 405B Instruct leads DeepSeek V4.1 Flash in General LLM at #5 against #32.
- Which to pick, Science: As of Oct 15, 2026, DeepSeek V4.1 Flash leads Llama 3.1 405B Instruct in Science at #36 against #124.

As of Oct 15, 2026, DeepSeek V4.1 Flash is state of the art on best per dollar in General LLM (since Oct 14, 2026; 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).