Claude Opus 5 vs DeepSeek V4 Flash
As of Oct 15, 2026, Claude Opus 5 leads DeepSeek V4 Flash in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.
Claude Opus 5
Close. Near-SOTA in Factuality, rank #4.
DeepSeek V4 Flash
Yes. Yes on General LLM (best per dollar); Reasoning (best per dollar). Not the overall leader.
| Category | Claude Opus 5 | DeepSeek V4 Flash |
|---|---|---|
| General LLM | #11 · Was SOTA · General LLM Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #75 · #75 in General LLM Margin 51.02040816326531 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #9 · Was SOTA · Reasoning Margin 6.849315068493155 LMArena leaderboard dataset · Oct 13, 2026 | #72 · #72 in Reasoning Margin 50 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 | — |
| 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 | #30 · #30 in Coding › Web dev Margin 27.10280373831776 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #9 · Was SOTA · Long context Margin 6.122448979591837 LMArena leaderboard dataset · Oct 13, 2026 | #69 · #69 in Long context Margin 46.93877551020408 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #12 · #12 in Vision Margin 36.8421052631579 Epoch AI benchmarking hub · Jul 24, 2026 | — |
| Factuality | #4 · Near-SOTA · Factuality Margin 3.731343283582092 LMArena leaderboard dataset · Oct 13, 2026 | #66 · #66 in Factuality Margin 50 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 | — |
Claude Opus 5: $10 per 1M blended tokens.
DeepSeek V4 Flash: $0.11374999999999999 per 1M blended tokens.
Claude Opus 5: closed weights.
DeepSeek V4 Flash: open weights.
General LLM: As of Oct 15, 2026, Claude Opus 5 leads DeepSeek V4 Flash in General LLM at #11 against #75.
Reasoning: As of Oct 15, 2026, Claude Opus 5 leads DeepSeek V4 Flash in Reasoning at #9 against #72.
Coding › Web dev: As of Oct 15, 2026, Claude Opus 5 leads DeepSeek V4 Flash in Coding › Web dev at #6 against #30.
Long context: As of Oct 15, 2026, Claude Opus 5 leads DeepSeek V4 Flash in Long context at #9 against #69.
Factuality: As of Oct 15, 2026, Claude Opus 5 leads DeepSeek V4 Flash in Factuality at #4 against #66.
Claude Opus 5 · DeepSeek V4 Flash
Claude Opus 5 or DeepSeek V4 Flash?
As of Oct 15, 2026, Claude Opus 5 leads DeepSeek V4 Flash in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.
Claude Opus 5 or DeepSeek V4 Flash for General LLM?
As of Oct 15, 2026, Claude Opus 5 leads DeepSeek V4 Flash in General LLM at #11 against #75.
Claude Opus 5 or DeepSeek V4 Flash for Reasoning?
As of Oct 15, 2026, Claude Opus 5 leads DeepSeek V4 Flash in Reasoning at #9 against #72.
Claude Opus 5 or DeepSeek V4 Flash for Coding › Web dev?
As of Oct 15, 2026, Claude Opus 5 leads DeepSeek V4 Flash in Coding › Web dev at #6 against #30.