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
#35 Best current rank: #35 in Math, as of Oct 14, 2026.
DeepSeek V4.1 Flash
Yes. Yes on General LLM (best per dollar); Reasoning (best per dollar). Not the overall leader.
| Category | Claude Sonnet 4 | DeepSeek V4.1 Flash |
|---|---|---|
| General LLM | #126 · #126 in General LLM Margin 85.71428571428571 LMArena leaderboard dataset · Oct 13, 2026 | #29 · #29 in General LLM Margin 19.72789115646259 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #115 · #115 in Reasoning Margin 79.45205479452055 LMArena leaderboard dataset · Oct 13, 2026 | #27 · #27 in Reasoning Margin 19.178082191780817 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #35 · #35 in Math Margin 77.77777777777777 Epoch AI benchmarking hub · May 22, 2025 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #97 · #97 in Science Margin — Epoch AI benchmarking hub · May 22, 2025 | #36 · #36 in Science Margin — Epoch AI benchmarking hub · Sep 9, 2026 |
| Coding | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | — | #19 · #19 in Coding › Web dev Margin 16.822429906542055 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #94 · #94 in Long context Margin 63.945578231292515 LMArena leaderboard dataset · Oct 13, 2026 | #32 · #32 in Long context Margin 21.768707482993193 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 | #21 · #21 in Vision Margin 57.89473684210526 Epoch AI benchmarking hub · Sep 9, 2026 |
| Factuality | — | #22 · #22 in Factuality Margin 17.164179104477626 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #67 · #67 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 22, 2025 | #8 · #8 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 9, 2026 |
Claude Sonnet 4: $6 per 1M blended tokens.
DeepSeek V4.1 Flash: $0.23463 per 1M blended tokens.
Claude Sonnet 4: closed weights.
DeepSeek V4.1 Flash: open weights.
General LLM: As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4 in General LLM at #29 against #126.
Reasoning: As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4 in Reasoning at #27 against #115.
Science: As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4 in Science at #36 against #97.
Long context: As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4 in Long context at #32 against #94.
Abstraction (ARC): As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4 in Abstraction (ARC) at #8 against #67.
Claude Sonnet 4 · DeepSeek V4.1 Flash
Claude Sonnet 4 or 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 or DeepSeek V4.1 Flash for General LLM?
As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4 in General LLM at #29 against #126.
Claude Sonnet 4 or DeepSeek V4.1 Flash for Reasoning?
As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4 in Reasoning at #27 against #115.
Claude Sonnet 4 or DeepSeek V4.1 Flash for Science?
As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4 in Science at #36 against #97.