Claude Opus 5.5 vs Claude Sonnet 4.6
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.6 in 8 of 8 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Vision, 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.
Claude Sonnet 4.6
It used to be. Was SOTA in Long context.
| Category | Claude Opus 5.5 | Claude Sonnet 4.6 |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 | #32 · #32 in General LLM Margin 21.768707482993193 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #20 · #20 in Reasoning Margin 14.38356164383562 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #50 · #50 in Science Margin — Epoch AI benchmarking hub · Feb 17, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Feb 17, 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 | #41 · #41 in Coding › Web dev Margin 37.38317757009346 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #20 · Was SOTA · Long context Margin 13.605442176870753 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | #23 · Was SOTA · Vision Margin 63.1578947368421 Epoch AI benchmarking hub · Feb 17, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #34 · #34 in Factuality Margin 26.11940298507463 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #23 · #23 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Feb 17, 2026 |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
Claude Sonnet 4.6: $6 per 1M blended tokens.
Claude Opus 5.5: closed weights.
Claude Sonnet 4.6: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.6 in General LLM at #2 against #32.
Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.6 in Reasoning at #1 against #20.
Science: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.6 in Science at #31 against #50.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.6 in Coding › Web dev at #1 against #41.
Long context: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.6 in Long context at #1 against #20.
Vision: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.6 in Vision at #4 against #23.
Factuality: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.6 in Factuality at #1 against #34.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.6 in Abstraction (ARC) at #1 against #23.
Claude Opus 5.5 · Claude Sonnet 4.6
Claude Opus 5.5 or Claude Sonnet 4.6?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.6 in 8 of 8 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Opus 5.5 or Claude Sonnet 4.6 for General LLM?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.6 in General LLM at #2 against #32.
Claude Opus 5.5 or Claude Sonnet 4.6 for Reasoning?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.6 in Reasoning at #1 against #20.
Claude Opus 5.5 or Claude Sonnet 4.6 for Science?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Sonnet 4.6 in Science at #31 against #50.