Claude Opus 5.5 vs DeepSeek V3.1 Terminus Thinking
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus Thinking in 3 of 3 shared categories: General LLM, Reasoning, and Long context.
Claude Opus 5.5
Yes. SOTA in Reasoning (tied), Coding (tied), Coding › Agentic (tied), Coding › Web dev, Long context (tied), and Factuality (tied).
DeepSeek V3.1 Terminus Thinking
#88 Best current rank: #88 in Long context, as of Oct 15, 2026.
| Category | Claude Opus 5.5 | DeepSeek V3.1 Terminus Thinking |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.0638297872340416 LMArena leaderboard dataset · Oct 13, 2026 | #126 · #126 in General LLM Margin 67.02127659574468 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #113 · #113 in Reasoning Margin 60.638297872340424 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · 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 | #88 · #88 in Long context Margin 46.808510638297875 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 Terminus Thinking: price per 1M tokens is unset in the catalog.
Claude Opus 5.5: closed weights.
DeepSeek V3.1 Terminus Thinking: open weights.
General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus Thinking in General LLM at #2 against #126.
Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus Thinking in Reasoning at #1 against #113.
Long context: As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus Thinking in Long context at #1 against #88.
Claude Opus 5.5 · DeepSeek V3.1 Terminus Thinking
Claude Opus 5.5 or DeepSeek V3.1 Terminus Thinking?
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus Thinking in 3 of 3 shared categories: General LLM, Reasoning, and Long context.
Claude Opus 5.5 or DeepSeek V3.1 Terminus Thinking for General LLM?
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus Thinking in General LLM at #2 against #126.
Claude Opus 5.5 or DeepSeek V3.1 Terminus Thinking for Reasoning?
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus Thinking in Reasoning at #1 against #113.
Claude Opus 5.5 or DeepSeek V3.1 Terminus Thinking for Long context?
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus Thinking in Long context at #1 against #88.