Claude Sonnet 5.5 vs DeepSeek V4 Pro
As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Pro in 6 of 6 shared categories: General LLM, Reasoning, Science, 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 Pro
#28 Best recorded rank: #28 in Science, as of Oct 14, 2026.
| Category | Claude Sonnet 5.5 | DeepSeek V4 Pro |
|---|---|---|
| General LLM | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 | #44 · #44 in General LLM Margin 29.931972789115648 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 | #45 · #45 in Reasoning Margin 31.506849315068493 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 | #28 · #28 in Science Margin — Epoch AI benchmarking hub · Apr 24, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Apr 24, 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 | #57 · #57 in Coding › Web dev Margin 52.33644859813084 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #11 · #11 in Long context Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #43 · #43 in Long context Margin 29.25170068027211 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 | #41 · #41 in Factuality Margin 31.343283582089555 LMArena leaderboard dataset · Oct 13, 2026 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
DeepSeek V4 Pro: $0.47523750000000003 per 1M blended tokens.
Claude Sonnet 5.5: closed weights.
DeepSeek V4 Pro: open weights.
General LLM: As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Pro in General LLM at #27 against #44.
Reasoning: As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Pro in Reasoning at #18 against #45.
Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Pro in Science at #3 against #28.
Coding › Web dev: As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Pro in Coding › Web dev at #3 against #57.
Long context: As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Pro in Long context at #11 against #43.
Factuality: As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Pro in Factuality at #16 against #41.
Claude Sonnet 5.5 · DeepSeek V4 Pro
Claude Sonnet 5.5 or DeepSeek V4 Pro?
As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Pro in 6 of 6 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, and Factuality.
Claude Sonnet 5.5 or DeepSeek V4 Pro for General LLM?
As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Pro in General LLM at #27 against #44.
Claude Sonnet 5.5 or DeepSeek V4 Pro for Reasoning?
As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Pro in Reasoning at #18 against #45.
Claude Sonnet 5.5 or DeepSeek V4 Pro for Science?
As of Oct 14, 2026, Claude Sonnet 5.5 leads DeepSeek V4 Pro in Science at #3 against #28.