Claude Opus 5 vs DeepSeek V4.1 Flash
As of Oct 14, 2026, Claude Opus 5 leads DeepSeek V4.1 Flash in 8 of 8 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Opus 5
Close. Near-SOTA in Factuality, rank #4.
DeepSeek V4.1 Flash
Yes. Yes on General LLM (best per dollar); Reasoning (best per dollar). Not the overall leader.
| Category | Claude Opus 5 | DeepSeek V4.1 Flash |
|---|---|---|
| General LLM | #11 · Was SOTA · General LLM Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #29 · #29 in General LLM Margin 19.72789115646259 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #9 · Was SOTA · Reasoning Margin 6.849315068493155 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 | #12 · #12 in Science Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #36 · #36 in Science Margin — Epoch AI benchmarking hub · Sep 9, 2026 |
| Coding | #4 · #4 in Coding Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #4 · #4 in Coding › Agentic Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #6 · Was SOTA · Coding › Web dev Margin 4.672897196261687 LMArena leaderboard dataset · Oct 13, 2026 | #19 · #19 in Coding › Web dev Margin 16.822429906542055 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #9 · Was SOTA · Long context Margin 6.122448979591837 LMArena leaderboard dataset · Oct 13, 2026 | #32 · #32 in Long context Margin 21.768707482993193 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #12 · #12 in Vision Margin 36.8421052631579 Epoch AI benchmarking hub · Jul 24, 2026 | #21 · #21 in Vision Margin 57.89473684210526 Epoch AI benchmarking hub · Sep 9, 2026 |
| Factuality | #4 · Near-SOTA · Factuality Margin 3.731343283582092 LMArena leaderboard dataset · Oct 13, 2026 | #22 · #22 in Factuality Margin 17.164179104477626 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #8 · #8 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 9, 2026 |
Claude Opus 5: $10 per 1M blended tokens.
DeepSeek V4.1 Flash: $0.23463 per 1M blended tokens.
Claude Opus 5: closed weights.
DeepSeek V4.1 Flash: open weights.
General LLM: As of Oct 14, 2026, Claude Opus 5 leads DeepSeek V4.1 Flash in General LLM at #11 against #29.
Reasoning: As of Oct 14, 2026, Claude Opus 5 leads DeepSeek V4.1 Flash in Reasoning at #9 against #27.
Science: As of Oct 14, 2026, Claude Opus 5 leads DeepSeek V4.1 Flash in Science at #12 against #36.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 5 leads DeepSeek V4.1 Flash in Coding › Web dev at #6 against #19.
Long context: As of Oct 14, 2026, Claude Opus 5 leads DeepSeek V4.1 Flash in Long context at #9 against #32.
Vision: As of Oct 14, 2026, Claude Opus 5 leads DeepSeek V4.1 Flash in Vision at #12 against #21.
Factuality: As of Oct 14, 2026, Claude Opus 5 leads DeepSeek V4.1 Flash in Factuality at #4 against #22.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5 leads DeepSeek V4.1 Flash in Abstraction (ARC) at #3 against #8.
Claude Opus 5 · DeepSeek V4.1 Flash
Claude Opus 5 or DeepSeek V4.1 Flash?
As of Oct 14, 2026, Claude Opus 5 leads DeepSeek V4.1 Flash in 8 of 8 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Opus 5 or DeepSeek V4.1 Flash for General LLM?
As of Oct 14, 2026, Claude Opus 5 leads DeepSeek V4.1 Flash in General LLM at #11 against #29.
Claude Opus 5 or DeepSeek V4.1 Flash for Reasoning?
As of Oct 14, 2026, Claude Opus 5 leads DeepSeek V4.1 Flash in Reasoning at #9 against #27.
Claude Opus 5 or DeepSeek V4.1 Flash for Science?
As of Oct 14, 2026, Claude Opus 5 leads DeepSeek V4.1 Flash in Science at #12 against #36.