Claude Sonnet 5.5 vs DeepSeek V4 Flash High Preview
As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Flash High Preview in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.
Claude Sonnet 5.5
Yes. SOTA in co-SOTA in Coding, co-SOTA in Coding › Agentic and co-SOTA in Vision.
DeepSeek V4 Flash High Preview
#65 Best current rank: #65 in Coding › Web dev, as of Oct 14, 2026.
| Category | Claude Sonnet 5.5 | DeepSeek V4 Flash High Preview |
|---|---|---|
| General LLM | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 | #71 · #71 in General LLM Margin 48.29931972789116 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 | #74 · #74 in Reasoning Margin 51.36986301369863 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 2026 | — |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #3 · Near-SOTA · Coding › Web dev Margin 1.8691588785046775 LMArena leaderboard dataset · Oct 13, 2026 | #65 · #65 in Coding › Web dev Margin 59.81308411214953 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #11 · #11 in Long context Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #68 · #68 in Long context Margin 46.25850340136054 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 | — |
| Factuality | #16 · #16 in Factuality Margin 12.68656716417911 LMArena leaderboard dataset · Oct 13, 2026 | #77 · #77 in Factuality Margin 58.208955223880594 LMArena leaderboard dataset · Oct 13, 2026 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
DeepSeek V4 Flash High Preview: price per 1M tokens is unset in the catalog.
Claude Sonnet 5.5: closed weights.
DeepSeek V4 Flash High Preview: open weights.
General LLM: As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Flash High Preview in General LLM at #27 against #71.
Reasoning: As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Flash High Preview in Reasoning at #18 against #74.
Coding › Web dev: As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Flash High Preview in Coding › Web dev at #3 against #65.
Long context: As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Flash High Preview in Long context at #11 against #68.
Factuality: As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Flash High Preview in Factuality at #16 against #77.
Claude Sonnet 5.5 · DeepSeek V4 Flash High Preview
Claude Sonnet 5.5 or DeepSeek V4 Flash High Preview?
As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Flash High Preview in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.
Claude Sonnet 5.5 or DeepSeek V4 Flash High Preview for General LLM?
As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Flash High Preview in General LLM at #27 against #71.
Claude Sonnet 5.5 or DeepSeek V4 Flash High Preview for Reasoning?
As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Flash High Preview in Reasoning at #18 against #74.
Claude Sonnet 5.5 or DeepSeek V4 Flash High Preview for Coding › Web dev?
As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Flash High Preview in Coding › Web dev at #3 against #65.