Claude Sonnet 5.5 vs DeepSeek R1
As of Oct 15, 2026, Claude Sonnet 5.5 leads DeepSeek R1 in 4 of 4 shared categories: General LLM, Reasoning, Science, and Long context.
Claude Sonnet 5.5
Yes. SOTA in Coding (tied), Coding › Agentic (tied), and Vision (tied).
DeepSeek R1
It used to be. Was SOTA in General LLM.
| Category | Claude Sonnet 5.5 | DeepSeek R1 |
|---|---|---|
| General LLM | #29 · #29 in General LLM Margin 15.425531914893611 LMArena leaderboard dataset · Oct 13, 2026 | #153 · Was SOTA · General LLM Margin 81.38297872340425 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 10.106382978723403 LMArena leaderboard dataset · Oct 13, 2026 | #151 · Was SOTA · Reasoning Margin 80.85106382978724 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 | #90 · #90 in Science Margin — Epoch AI benchmarking hub · Jan 20, 2025 |
| 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 1.5999999999999943 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #11 · #11 in Long context Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 | #160 · Was SOTA · Long context Margin 85.1063829787234 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 | — |
| Factuality | #17 · #17 in Factuality Margin 10.465116279069761 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Abstraction (ARC) | — | #77 · #77 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jan 20, 2025 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
DeepSeek R1: $1.15 per 1M blended tokens.
Claude Sonnet 5.5: closed weights.
DeepSeek R1: open weights.
General LLM: As of Oct 15, 2026, Claude Sonnet 5.5 leads DeepSeek R1 in General LLM at #29 against #153.
Reasoning: As of Oct 15, 2026, Claude Sonnet 5.5 leads DeepSeek R1 in Reasoning at #18 against #151.
Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads DeepSeek R1 in Science at #3 against #90.
Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads DeepSeek R1 in Long context at #11 against #160.
Claude Sonnet 5.5 · DeepSeek R1
Claude Sonnet 5.5 or DeepSeek R1?
As of Oct 15, 2026, Claude Sonnet 5.5 leads DeepSeek R1 in 4 of 4 shared categories: General LLM, Reasoning, Science, and Long context.
Claude Sonnet 5.5 or DeepSeek R1 for General LLM?
As of Oct 15, 2026, Claude Sonnet 5.5 leads DeepSeek R1 in General LLM at #29 against #153.
Claude Sonnet 5.5 or DeepSeek R1 for Reasoning?
As of Oct 15, 2026, Claude Sonnet 5.5 leads DeepSeek R1 in Reasoning at #18 against #151.
Claude Sonnet 5.5 or DeepSeek R1 for Science?
As of Oct 15, 2026, Claude Sonnet 5.5 leads DeepSeek R1 in Science at #3 against #90.