# Claude Sonnet 4 vs DeepSeek V4.1 Flash

As of Oct 14, 2026, Claude Sonnet 4 leads DeepSeek V4.1 Flash in 0 of 5 shared categories.

Claude Sonnet 4: $6 per 1M blended tokens.

DeepSeek V4.1 Flash: $0.26249999999999996 per 1M blended tokens.

Claude Sonnet 4: closed weights.

DeepSeek V4.1 Flash: open weights.

- Which to pick, General LLM: As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4 in General LLM at #29 against #126.
- Which to pick, Reasoning: As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4 in Reasoning at #27 against #115.
- Which to pick, Science: As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4 in Science at #36 against #97.
- Which to pick, Long context: As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4 in Long context at #32 against #94.
- Which to pick, Abstraction (ARC): As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4 in Abstraction (ARC) at #8 against #67.

As of Oct 14, 2026, Claude Sonnet 4 is ranked #35 in Math (since Oct 14, 2026; sources Humanity's Last Exam; methodology v1.0).

As of Oct 14, 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).