Claude Sonnet 4.6 vs DeepSeek V4.1 Flash
As of Oct 14, 2026, Claude Sonnet 4.6 leads DeepSeek V4.1 Flash in 2 of 8 shared categories: Reasoning and Long context.
Claude Sonnet 4.6
It used to be. Was SOTA in Long context.
DeepSeek V4.1 Flash
Yes. Yes on General LLM (best per dollar); Reasoning (best per dollar). Not the overall leader.
| Category | Claude Sonnet 4.6 | DeepSeek V4.1 Flash |
|---|---|---|
| General LLM | #32 · #32 in General LLM Margin 21.768707482993193 LMArena leaderboard dataset · Oct 13, 2026 | #29 · #29 in General LLM Margin 19.72789115646259 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #20 · #20 in Reasoning Margin 14.38356164383562 LMArena leaderboard dataset · Oct 13, 2026 | #27 · #27 in Reasoning Margin 19.178082191780817 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #50 · #50 in Science Margin — Epoch AI benchmarking hub · Feb 17, 2026 | #36 · #36 in Science Margin — Epoch AI benchmarking hub · Sep 9, 2026 |
| Coding | #— · Not enough data Margin — Epoch AI benchmarking hub · Feb 17, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | #41 · #41 in Coding › Web dev Margin 37.38317757009346 LMArena leaderboard dataset · Oct 13, 2026 | #19 · #19 in Coding › Web dev Margin 16.822429906542055 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #20 · Was SOTA · Long context Margin 13.605442176870753 LMArena leaderboard dataset · Oct 13, 2026 | #32 · #32 in Long context Margin 21.768707482993193 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #23 · Was SOTA · Vision Margin 63.1578947368421 Epoch AI benchmarking hub · Feb 17, 2026 | #21 · #21 in Vision Margin 57.89473684210526 Epoch AI benchmarking hub · Sep 9, 2026 |
| Factuality | #34 · #34 in Factuality Margin 26.11940298507463 LMArena leaderboard dataset · Oct 13, 2026 | #22 · #22 in Factuality Margin 17.164179104477626 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #23 · #23 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Feb 17, 2026 | #8 · #8 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 9, 2026 |
Claude Sonnet 4.6: $6 per 1M blended tokens.
DeepSeek V4.1 Flash: $0.16319999999999998 per 1M blended tokens.
Claude Sonnet 4.6: closed weights.
DeepSeek V4.1 Flash: open weights.
General LLM: As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4.6 in General LLM at #29 against #32.
Reasoning: As of Oct 14, 2026, Claude Sonnet 4.6 leads DeepSeek V4.1 Flash in Reasoning at #20 against #27.
Science: As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4.6 in Science at #36 against #50.
Coding › Web dev: As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4.6 in Coding › Web dev at #19 against #41.
Long context: As of Oct 14, 2026, Claude Sonnet 4.6 leads DeepSeek V4.1 Flash in Long context at #20 against #32.
Vision: As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4.6 in Vision at #21 against #23.
Factuality: As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4.6 in Factuality at #22 against #34.
Abstraction (ARC): As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4.6 in Abstraction (ARC) at #8 against #23.
Claude Sonnet 4.6 · DeepSeek V4.1 Flash
Claude Sonnet 4.6 or DeepSeek V4.1 Flash?
As of Oct 14, 2026, Claude Sonnet 4.6 leads DeepSeek V4.1 Flash in 2 of 8 shared categories: Reasoning and Long context.
Claude Sonnet 4.6 or DeepSeek V4.1 Flash for General LLM?
As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4.6 in General LLM at #29 against #32.
Claude Sonnet 4.6 or DeepSeek V4.1 Flash for Reasoning?
As of Oct 14, 2026, Claude Sonnet 4.6 leads DeepSeek V4.1 Flash in Reasoning at #20 against #27.
Claude Sonnet 4.6 or DeepSeek V4.1 Flash for Science?
As of Oct 14, 2026, DeepSeek V4.1 Flash leads Claude Sonnet 4.6 in Science at #36 against #50.