Claude Opus 5.5 vs DeepSeek V3.1 Terminus
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus 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
#128 Best current rank: #128 in General LLM, as of Oct 15, 2026.
| Category | Claude Opus 5.5 | DeepSeek V3.1 Terminus |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.0638297872340416 LMArena leaderboard dataset · Oct 13, 2026 | #128 · #128 in General LLM Margin 68.08510638297872 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #142 · #142 in Reasoning Margin 76.06382978723404 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 | #133 · #133 in Long context Margin 70.74468085106383 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: $0.4525 per 1M blended tokens.
Claude Opus 5.5: closed weights.
DeepSeek V3.1 Terminus: open weights.
General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus in General LLM at #2 against #128.
Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus in Reasoning at #1 against #142.
Long context: As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus in Long context at #1 against #133.
Claude Opus 5.5 · DeepSeek V3.1 Terminus
Claude Opus 5.5 or DeepSeek V3.1 Terminus?
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus in 3 of 3 shared categories: General LLM, Reasoning, and Long context.
Claude Opus 5.5 or DeepSeek V3.1 Terminus for General LLM?
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus in General LLM at #2 against #128.
Claude Opus 5.5 or DeepSeek V3.1 Terminus for Reasoning?
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus in Reasoning at #1 against #142.
Claude Opus 5.5 or DeepSeek V3.1 Terminus for Long context?
As of Oct 15, 2026, Claude Opus 5.5 leads DeepSeek V3.1 Terminus in Long context at #1 against #133.