Claude Opus 4.6 vs Claude Sonnet 5.5
As of Oct 14, 2026, Claude Opus 4.6 leads Claude Sonnet 5.5 in 4 of 7 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Opus 4.6
Close. Near-SOTA in Reasoning, rank #2.
Claude Sonnet 5.5
Yes. SOTA in co-SOTA in Coding, co-SOTA in Coding › Agentic and co-SOTA in Vision.
| Category | Claude Opus 4.6 | Claude Sonnet 5.5 |
|---|---|---|
| General LLM | #4 · Near-SOTA · General LLM Margin 2.7210884353741562 LMArena leaderboard dataset · Oct 13, 2026 | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #2 · Near-SOTA · Reasoning Margin 2.0547945205479436 LMArena leaderboard dataset · Oct 13, 2026 | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #11 · #11 in Math Margin 22.22222222222223 Epoch AI benchmarking hub · Feb 5, 2026 | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 |
| Science | #32 · #32 in Science Margin — Epoch AI benchmarking hub · Feb 5, 2026 | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 2026 |
| Coding | #— · Not enough data Margin — Epoch AI benchmarking hub · Feb 5, 2026 | #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 | #35 · Was SOTA · Coding › Web dev Margin 31.775700934579433 LMArena leaderboard dataset · Oct 13, 2026 | #3 · Near-SOTA · Coding › Web dev Margin 1.8691588785046775 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #2 · Near-SOTA · Long context Margin 0.6802721088435391 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 | #3 · Near-SOTA · Factuality Margin 2.9850746268656536 LMArena leaderboard dataset · Oct 13, 2026 | #16 · #16 in Factuality Margin 12.68656716417911 LMArena leaderboard dataset · Oct 13, 2026 |
Claude Opus 4.6: $10 per 1M blended tokens.
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
Claude Opus 4.6: closed weights.
Claude Sonnet 5.5: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 4.6 leads Claude Sonnet 5.5 in General LLM at #4 against #27.
Reasoning: As of Oct 14, 2026, Claude Opus 4.6 leads Claude Sonnet 5.5 in Reasoning at #2 against #18.
Math: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4.6 in Math at #4 against #11.
Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4.6 in Science at #3 against #32.
Coding › Web dev: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4.6 in Coding › Web dev at #3 against #35.
Long context: As of Oct 14, 2026, Claude Opus 4.6 leads Claude Sonnet 5.5 in Long context at #2 against #11.
Factuality: As of Oct 14, 2026, Claude Opus 4.6 leads Claude Sonnet 5.5 in Factuality at #3 against #16.
Claude Opus 4.6 · Claude Sonnet 5.5
Claude Opus 4.6 or Claude Sonnet 5.5?
As of Oct 14, 2026, Claude Opus 4.6 leads Claude Sonnet 5.5 in 4 of 7 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Opus 4.6 or Claude Sonnet 5.5 for General LLM?
As of Oct 14, 2026, Claude Opus 4.6 leads Claude Sonnet 5.5 in General LLM at #4 against #27.
Claude Opus 4.6 or Claude Sonnet 5.5 for Reasoning?
As of Oct 14, 2026, Claude Opus 4.6 leads Claude Sonnet 5.5 in Reasoning at #2 against #18.
Claude Opus 4.6 or Claude Sonnet 5.5 for Math?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4.6 in Math at #4 against #11.