Claude Opus 5.5 vs DeepSeek R1
As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek R1 in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Abstraction (ARC).
Claude Opus 5.5
Yes. SOTA in co-SOTA in Reasoning, co-SOTA in Coding, co-SOTA in Coding › Agentic, Coding › Web dev, co-SOTA in Long context and co-SOTA in Factuality.
DeepSeek R1
It used to be. Was SOTA in General LLM.
| Category | Claude Opus 5.5 | DeepSeek R1 |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 | #118 · Was SOTA · General LLM Margin 80.27210884353741 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #116 · Was SOTA · Reasoning Margin 80.13698630136986 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 | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 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 | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #123 · Was SOTA · Long context Margin 83.6734693877551 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | — |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #77 · #77 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jan 20, 2025 |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
DeepSeek R1: $1.15 per 1M blended tokens.
Claude Opus 5.5: closed weights.
DeepSeek R1: open weights.
General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek R1 in General LLM at #2 against #118.
Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek R1 in Reasoning at #1 against #116.
Science: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek R1 in Science at #31 against #90.
Long context: As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek R1 in Long context at #1 against #123.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek R1 in Abstraction (ARC) at #1 against #77.
Claude Opus 5.5 or DeepSeek R1?
As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek R1 in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Abstraction (ARC).
Claude Opus 5.5 or DeepSeek R1 for General LLM?
As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek R1 in General LLM at #2 against #118.
Claude Opus 5.5 or DeepSeek R1 for Reasoning?
As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek R1 in Reasoning at #1 against #116.
Claude Opus 5.5 or DeepSeek R1 for Science?
As of Oct 14, 2026, Claude Opus 5.5 leads DeepSeek R1 in Science at #31 against #90.