Claude Opus 4.5 20251101 vs Claude Opus 5.5
As of Oct 14, 2026, Claude Opus 4.5 20251101 leads Claude Opus 5.5 in 0 of 2 shared categories.
Claude Opus 4.5 20251101
#27 Best recorded rank: #27 in Abstraction (ARC), as of Oct 14, 2026.
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.
| Category | Claude Opus 4.5 20251101 | Claude Opus 5.5 |
|---|---|---|
| General LLM | — | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #— · Not enough data Margin — Epoch AI benchmarking hub · Nov 24, 2025 | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | — | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #55 · #55 in Science Margin — Epoch AI benchmarking hub · Nov 24, 2025 | #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 |
| 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 |
| Vision | — | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 |
| Factuality | #— · Not enough data Margin — Epoch AI benchmarking hub · Nov 24, 2025 | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #27 · #27 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Nov 24, 2025 | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 |
Claude Opus 4.5 20251101: price per 1M tokens is unset in the catalog.
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
Claude Opus 4.5 20251101: closed weights.
Claude Opus 5.5: closed weights.
Science: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4.5 20251101 in Science at #31 against #55.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4.5 20251101 in Abstraction (ARC) at #1 against #27.
Claude Opus 4.5 20251101 · Claude Opus 5.5
Claude Opus 4.5 20251101 or Claude Opus 5.5?
As of Oct 14, 2026, Claude Opus 4.5 20251101 leads Claude Opus 5.5 in 0 of 2 shared categories.
Claude Opus 4.5 20251101 or Claude Opus 5.5 for Science?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4.5 20251101 in Science at #31 against #55.
Claude Opus 4.5 20251101 or Claude Opus 5.5 for Abstraction (ARC)?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4.5 20251101 in Abstraction (ARC) at #1 against #27.