Claude 3.5 Sonnet vs Claude Opus 5
As of Oct 15, 2026, Claude 3.5 Sonnet leads Claude Opus 5 in 0 of 4 shared categories.
Claude 3.5 Sonnet
It used to be. Was SOTA in General LLM.
Claude Opus 5
Close. Near-SOTA in Factuality, rank #4.
| Category | Claude 3.5 Sonnet | Claude Opus 5 |
|---|---|---|
| General LLM | #140 · Was SOTA · General LLM Margin 95.23809523809524 LMArena leaderboard dataset · Oct 13, 2026 | #11 · Was SOTA · General LLM Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #136 · Was SOTA · Reasoning Margin 93.83561643835617 LMArena leaderboard dataset · Oct 13, 2026 | #9 · Was SOTA · Reasoning Margin 6.849315068493155 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #43 · #43 in Math Margin 95.55555555555556 Epoch AI benchmarking hub · Oct 22, 2024 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #119 · #119 in Science Margin — Epoch AI benchmarking hub · Oct 22, 2024 | #12 · #12 in Science Margin — Epoch AI benchmarking hub · Jul 24, 2026 |
| Coding | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #4 · #4 in Coding Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | — | #4 · #4 in Coding › Agentic Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | — | #6 · Was SOTA · Coding › Web dev Margin 4.672897196261687 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #126 · Was SOTA · Long context Margin 85.71428571428571 LMArena leaderboard dataset · Oct 13, 2026 | #9 · Was SOTA · Long context Margin 6.122448979591837 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 | #12 · #12 in Vision Margin 36.8421052631579 Epoch AI benchmarking hub · Jul 24, 2026 |
| Factuality | — | #4 · Near-SOTA · Factuality Margin 3.731343283582092 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | — | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 |
Claude 3.5 Sonnet: price per 1M tokens is unset in the catalog.
Claude Opus 5: $10 per 1M blended tokens.
Claude 3.5 Sonnet: closed weights.
Claude Opus 5: closed weights.
General LLM: As of Oct 15, 2026, Claude Opus 5 leads Claude 3.5 Sonnet in General LLM at #11 against #140.
Reasoning: As of Oct 15, 2026, Claude Opus 5 leads Claude 3.5 Sonnet in Reasoning at #9 against #136.
Science: As of Oct 15, 2026, Claude Opus 5 leads Claude 3.5 Sonnet in Science at #12 against #119.
Long context: As of Oct 15, 2026, Claude Opus 5 leads Claude 3.5 Sonnet in Long context at #9 against #126.
Claude 3.5 Sonnet · Claude Opus 5
Claude 3.5 Sonnet or Claude Opus 5?
As of Oct 15, 2026, Claude 3.5 Sonnet leads Claude Opus 5 in 0 of 4 shared categories.
Claude 3.5 Sonnet or Claude Opus 5 for General LLM?
As of Oct 15, 2026, Claude Opus 5 leads Claude 3.5 Sonnet in General LLM at #11 against #140.
Claude 3.5 Sonnet or Claude Opus 5 for Reasoning?
As of Oct 15, 2026, Claude Opus 5 leads Claude 3.5 Sonnet in Reasoning at #9 against #136.
Claude 3.5 Sonnet or Claude Opus 5 for Science?
As of Oct 15, 2026, Claude Opus 5 leads Claude 3.5 Sonnet in Science at #12 against #119.