# DeepSeek V4.1 Flash vs GPT-5.1

As of Oct 15, 2026, DeepSeek V4.1 Flash leads GPT-5.1 in 7 of 7 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Factuality, and Abstraction (ARC).

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

GPT-5.1: $3.4375000000000004 per 1M blended tokens.

DeepSeek V4.1 Flash: open weights.

GPT-5.1: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, DeepSeek V4.1 Flash leads GPT-5.1 in General LLM at #29 against #47.
- Which to pick, Reasoning: As of Oct 15, 2026, DeepSeek V4.1 Flash leads GPT-5.1 in Reasoning at #27 against #48.
- Which to pick, Science: As of Oct 15, 2026, DeepSeek V4.1 Flash leads GPT-5.1 in Science at #36 against #48.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, DeepSeek V4.1 Flash leads GPT-5.1 in Coding › Web dev at #19 against #75.
- Which to pick, Long context: As of Oct 15, 2026, DeepSeek V4.1 Flash leads GPT-5.1 in Long context at #32 against #54.
- Which to pick, Factuality: As of Oct 15, 2026, DeepSeek V4.1 Flash leads GPT-5.1 in Factuality at #22 against #37.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, DeepSeek V4.1 Flash leads GPT-5.1 in Abstraction (ARC) at #8 against #31.

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, GPT-5.1 is ranked #18 in Math (since Oct 15, 2026; sources Humanity's Last Exam; methodology v1.0).