Claude Opus 5.5 vs Claude Sonnet 4.5 20250929
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.5 20250929 in 2 of 2 shared categories: Science 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.
Claude Sonnet 4.5 20250929
#36 Best recorded rank: #36 in Abstraction (ARC), as of Oct 14, 2026.
| Category | Claude Opus 5.5 | Claude Sonnet 4.5 20250929 |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Sep 29, 2025 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | — |
| Science | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #66 · #66 in Science Margin — Epoch AI benchmarking hub · Sep 29, 2025 |
| 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 | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Sep 29, 2025 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #36 · #36 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 29, 2025 |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
Claude Sonnet 4.5 20250929: price per 1M tokens is unset in the catalog.
Claude Opus 5.5: closed weights.
Claude Sonnet 4.5 20250929: closed weights.
Science: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.5 20250929 in Science at #31 against #66.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.5 20250929 in Abstraction (ARC) at #1 against #36.
Claude Opus 5.5 · Claude Sonnet 4.5 20250929
Claude Opus 5.5 or Claude Sonnet 4.5 20250929?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.5 20250929 in 2 of 2 shared categories: Science and Abstraction (ARC).
Claude Opus 5.5 or Claude Sonnet 4.5 20250929 for Science?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.5 20250929 in Science at #31 against #66.
Claude Opus 5.5 or Claude Sonnet 4.5 20250929 for Abstraction (ARC)?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.5 20250929 in Abstraction (ARC) at #1 against #36.