# DeepSeek V4.1 Flash vs O1 Preview

As of Oct 15, 2026, DeepSeek V4.1 Flash leads O1 Preview in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Abstraction (ARC).

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

O1 Preview: price per 1M tokens is unset in the catalog.

DeepSeek V4.1 Flash: open weights.

O1 Preview: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, DeepSeek V4.1 Flash leads O1 Preview in General LLM at #32 against #166.
- Which to pick, Reasoning: As of Oct 15, 2026, DeepSeek V4.1 Flash leads O1 Preview in Reasoning at #29 against #177.
- Which to pick, Science: As of Oct 15, 2026, DeepSeek V4.1 Flash leads O1 Preview in Science at #36 against #125.
- Which to pick, Long context: As of Oct 15, 2026, DeepSeek V4.1 Flash leads O1 Preview in Long context at #37 against #176.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, DeepSeek V4.1 Flash leads O1 Preview in Abstraction (ARC) at #8 against #73.

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, O1 Preview is a former state-of-the-art holder in General LLM (since Sep 27, 2024; sources LMArena Text (style-controlled, overall); methodology v1.0).