Claude Opus 5 vs Claude Sonnet 5.5
As of Oct 15, 2026, Claude Opus 5 leads Claude Sonnet 5.5 in 4 of 9 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Opus 5
Close. Near-SOTA in Factuality, rank #4.
Claude Sonnet 5.5
Yes. SOTA in Coding (tied), Coding › Agentic (tied), and Vision (tied).
| Category | Claude Opus 5 | Claude Sonnet 5.5 |
|---|---|---|
| General LLM | #11 · Was SOTA · General LLM Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 | #29 · #29 in General LLM Margin 15.425531914893611 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #9 · Was SOTA · Reasoning Margin 5.319148936170208 LMArena leaderboard dataset · Oct 13, 2026 | #18 · #18 in Reasoning Margin 10.106382978723403 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 |
| Science | #12 · #12 in Science Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 2026 |
| Coding | #4 · #4 in Coding Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #4 · #4 in Coding › Agentic Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | #6 · Near-SOTA · Coding › Web dev Margin 4 LMArena leaderboard dataset · Oct 13, 2026 | #3 · Near-SOTA · Coding › Web dev Margin 1.5999999999999943 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #9 · Was SOTA · Long context Margin 4.7872340425531945 LMArena leaderboard dataset · Oct 13, 2026 | #11 · #11 in Long context Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #12 · #12 in Vision Margin 36.8421052631579 Epoch AI benchmarking hub · Jul 24, 2026 | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 |
| Factuality | #4 · Near-SOTA · Factuality Margin 2.9069767441860535 LMArena leaderboard dataset · Oct 13, 2026 | #17 · #17 in Factuality Margin 10.465116279069761 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 | — |
Claude Opus 5: $10 per 1M blended tokens.
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
Claude Opus 5: closed weights.
Claude Sonnet 5.5: closed weights.
General LLM: As of Oct 15, 2026, Claude Opus 5 leads Claude Sonnet 5.5 in General LLM at #11 against #29.
Reasoning: As of Oct 15, 2026, Claude Opus 5 leads Claude Sonnet 5.5 in Reasoning at #9 against #18.
Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Opus 5 in Science at #3 against #12.
Coding: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Opus 5 in Coding at #1 against #4.
Coding › Agentic: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Opus 5 in Coding › Agentic at #1 against #4.
Coding › Web dev: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Opus 5 in Coding › Web dev at #3 against #6.
Long context: As of Oct 15, 2026, Claude Opus 5 leads Claude Sonnet 5.5 in Long context at #9 against #11.
Vision: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Opus 5 in Vision at #1 against #12.
Factuality: As of Oct 15, 2026, Claude Opus 5 leads Claude Sonnet 5.5 in Factuality at #4 against #17.
Claude Opus 5 · Claude Sonnet 5.5
Claude Opus 5 or Claude Sonnet 5.5?
As of Oct 15, 2026, Claude Opus 5 leads Claude Sonnet 5.5 in 4 of 9 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Opus 5 or Claude Sonnet 5.5 for General LLM?
As of Oct 15, 2026, Claude Opus 5 leads Claude Sonnet 5.5 in General LLM at #11 against #29.
Claude Opus 5 or Claude Sonnet 5.5 for Reasoning?
As of Oct 15, 2026, Claude Opus 5 leads Claude Sonnet 5.5 in Reasoning at #9 against #18.
Claude Opus 5 or Claude Sonnet 5.5 for Science?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Opus 5 in Science at #3 against #12.