Claude Opus 4 vs Claude Sonnet 5.5
As of Oct 14, 2026, Claude Opus 4 leads Claude Sonnet 5.5 in 0 of 5 shared categories.
Claude Opus 4
It used to be. Was SOTA in Reasoning.
Claude Sonnet 5.5
Yes. SOTA in co-SOTA in Coding, co-SOTA in Coding › Agentic and co-SOTA in Vision.
| Category | Claude Opus 4 | Claude Sonnet 5.5 |
|---|---|---|
| General LLM | #102 · #102 in General LLM Margin 69.38775510204081 LMArena leaderboard dataset · Oct 13, 2026 | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #97 · Was SOTA · Reasoning Margin 67.12328767123287 LMArena leaderboard dataset · Oct 13, 2026 | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #29 · #29 in Math Margin 62.22222222222222 Epoch AI benchmarking hub · May 22, 2025 | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 |
| Science | #91 · #91 in Science Margin — Epoch AI benchmarking hub · May 22, 2025 | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 2026 |
| Coding | #— · Not enough data Margin — Epoch AI benchmarking hub · May 22, 2025 | #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 | — | #3 · Near-SOTA · Coding › Web dev Margin 1.8691588785046775 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #70 · #70 in Long context Margin 47.61904761904762 LMArena leaderboard dataset · Oct 13, 2026 | #11 · #11 in Long context Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 |
| Factuality | — | #16 · #16 in Factuality Margin 12.68656716417911 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #69 · #69 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 22, 2025 | — |
Claude Opus 4: price per 1M tokens is unset in the catalog.
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
Claude Opus 4: closed weights.
Claude Sonnet 5.5: closed weights.
General LLM: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4 in General LLM at #27 against #102.
Reasoning: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4 in Reasoning at #18 against #97.
Math: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4 in Math at #4 against #29.
Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4 in Science at #3 against #91.
Long context: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4 in Long context at #11 against #70.
Claude Opus 4 · Claude Sonnet 5.5
Claude Opus 4 or Claude Sonnet 5.5?
As of Oct 14, 2026, Claude Opus 4 leads Claude Sonnet 5.5 in 0 of 5 shared categories.
Claude Opus 4 or Claude Sonnet 5.5 for General LLM?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4 in General LLM at #27 against #102.
Claude Opus 4 or Claude Sonnet 5.5 for Reasoning?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4 in Reasoning at #18 against #97.
Claude Opus 4 or Claude Sonnet 5.5 for Math?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4 in Math at #4 against #29.