Claude Opus 5.5 vs DeepSeek V3.1 Thinking
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Thinking in 3 of 3 shared categories: General LLM, Reasoning, and Long context.
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 V3.1 Thinking
#73 Best current rank: #73 in Long context, as of Oct 15, 2026.
| Category | Claude Opus 5.5 | DeepSeek V3.1 Thinking |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 | #98 · #98 in General LLM Margin 66.66666666666666 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #96 · #96 in Reasoning Margin 66.43835616438356 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 | — |
| 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 | #73 · #73 in Long context Margin 49.65986394557824 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 | — |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
DeepSeek V3.1 Thinking: price per 1M tokens is unset in the catalog.
Claude Opus 5.5: closed weights.
DeepSeek V3.1 Thinking: open weights.
General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Thinking in General LLM at #2 against #98.
Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Thinking in Reasoning at #1 against #96.
Long context: As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Thinking in Long context at #1 against #73.
Claude Opus 5.5 · DeepSeek V3.1 Thinking
Claude Opus 5.5 or DeepSeek V3.1 Thinking?
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Thinking in 3 of 3 shared categories: General LLM, Reasoning, and Long context.
Claude Opus 5.5 or DeepSeek V3.1 Thinking for General LLM?
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Thinking in General LLM at #2 against #98.
Claude Opus 5.5 or DeepSeek V3.1 Thinking for Reasoning?
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Thinking in Reasoning at #1 against #96.
Claude Opus 5.5 or DeepSeek V3.1 Thinking for Long context?
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Thinking in Long context at #1 against #73.