Claude Opus 5.5 vs GPT-5.1
As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.1 in 7 of 7 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Factuality, 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.
GPT-5.1
#18 Best current rank: #18 in Math, as of Oct 14, 2026.
| Category | Claude Opus 5.5 | GPT-5.1 |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 | #47 · #47 in General LLM Margin 31.972789115646265 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #48 · #48 in Reasoning Margin 33.56164383561644 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #18 · #18 in Math Margin 37.77777777777778 Epoch AI benchmarking hub · Nov 13, 2025 |
| Science | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #48 · #48 in Science Margin — Epoch AI benchmarking hub · Nov 13, 2025 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Nov 13, 2025 |
| 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 | #75 · #75 in Coding › Web dev Margin 69.1588785046729 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #54 · #54 in Long context Margin 36.73469387755103 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #37 · #37 in Factuality Margin 28.358208955223887 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #31 · #31 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Nov 13, 2025 |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
GPT-5.1: $3.4375000000000004 per 1M blended tokens.
Claude Opus 5.5: closed weights.
GPT-5.1: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.1 in General LLM at #2 against #47.
Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.1 in Reasoning at #1 against #48.
Science: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.1 in Science at #31 against #48.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.1 in Coding › Web dev at #1 against #75.
Long context: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.1 in Long context at #1 against #54.
Factuality: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.1 in Factuality at #1 against #37.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.1 in Abstraction (ARC) at #1 against #31.
Claude Opus 5.5 or GPT-5.1?
As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.1 in 7 of 7 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Factuality, and Abstraction (ARC).
Claude Opus 5.5 or GPT-5.1 for General LLM?
As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.1 in General LLM at #2 against #47.
Claude Opus 5.5 or GPT-5.1 for Reasoning?
As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.1 in Reasoning at #1 against #48.
Claude Opus 5.5 or GPT-5.1 for Science?
As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.1 in Science at #31 against #48.