Claude Opus 5.5 vs O1
As of Oct 14, 2026, Claude Opus 5.5 leads O1 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.
O1
It used to be. Was SOTA in General LLM.
| Category | Claude Opus 5.5 | O1 |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 | #112 · Was SOTA · General LLM Margin 76.19047619047619 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #117 · Was SOTA · Reasoning Margin 80.82191780821918 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #34 · #34 in Math Margin 75.55555555555556 Epoch AI benchmarking hub · Dec 17, 2024 |
| Science | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #77 · #77 in Science Margin — Epoch AI benchmarking hub · Dec 17, 2024 |
| 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 | #108 · Was SOTA · Long context Margin 73.46938775510205 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 | #— · Not enough data Margin — Epoch AI benchmarking hub · Dec 17, 2024 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #57 · #57 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Dec 17, 2024 |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
O1: $26.25 per 1M blended tokens.
Claude Opus 5.5: closed weights.
O1: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads O1 in General LLM at #2 against #112.
Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads O1 in Reasoning at #1 against #117.
Science: As of Oct 14, 2026, Claude Opus 5.5 leads O1 in Science at #31 against #77.
Long context: As of Oct 14, 2026, Claude Opus 5.5 leads O1 in Long context at #1 against #108.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5.5 leads O1 in Abstraction (ARC) at #1 against #57.
Claude Opus 5.5 or O1?
As of Oct 14, 2026, Claude Opus 5.5 leads O1 in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Abstraction (ARC).
Claude Opus 5.5 or O1 for General LLM?
As of Oct 14, 2026, Claude Opus 5.5 leads O1 in General LLM at #2 against #112.
Claude Opus 5.5 or O1 for Reasoning?
As of Oct 14, 2026, Claude Opus 5.5 leads O1 in Reasoning at #1 against #117.
Claude Opus 5.5 or O1 for Science?
As of Oct 14, 2026, Claude Opus 5.5 leads O1 in Science at #31 against #77.