Claude Opus 5 vs Claude Sonnet 4.5
As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in 7 of 7 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Factuality, and Abstraction (ARC).
Claude Opus 5
Close. Near-SOTA in Factuality, rank #4.
Claude Sonnet 4.5
It used to be. Was SOTA in General LLM.
| Category | Claude Opus 5 | Claude Sonnet 4.5 |
|---|---|---|
| General LLM | #11 · Was SOTA · General LLM Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #49 · Was SOTA · General LLM Margin 33.33333333333333 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #9 · Was SOTA · Reasoning Margin 6.849315068493155 LMArena leaderboard dataset · Oct 13, 2026 | #40 · Was SOTA · Reasoning Margin 28.082191780821915 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #25 · #25 in Math Margin 53.333333333333336 Epoch AI benchmarking hub · Sep 29, 2025 |
| Science | #12 · #12 in Science Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #82 · #82 in Science Margin — Epoch AI benchmarking hub · Sep 29, 2025 |
| Coding | #4 · #4 in Coding Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Sep 29, 2025 |
| 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 | #78 · Was SOTA · Coding › Web dev Margin 71.96261682242991 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #9 · Was SOTA · Long context Margin 6.122448979591837 LMArena leaderboard dataset · Oct 13, 2026 | #29 · Was SOTA · Long context Margin 19.72789115646259 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #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 | #50 · #50 in Factuality Margin 38.059701492537314 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #66 · #66 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 29, 2025 |
Claude Opus 5: $10 per 1M blended tokens.
Claude Sonnet 4.5: $6 per 1M blended tokens.
Claude Opus 5: closed weights.
Claude Sonnet 4.5: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in General LLM at #11 against #49.
Reasoning: As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in Reasoning at #9 against #40.
Science: As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in Science at #12 against #82.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in Coding › Web dev at #6 against #78.
Long context: As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in Long context at #9 against #29.
Factuality: As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in Factuality at #4 against #50.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in Abstraction (ARC) at #3 against #66.
Claude Opus 5 · Claude Sonnet 4.5
Claude Opus 5 or Claude Sonnet 4.5?
As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in 7 of 7 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Factuality, and Abstraction (ARC).
Claude Opus 5 or Claude Sonnet 4.5 for General LLM?
As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in General LLM at #11 against #49.
Claude Opus 5 or Claude Sonnet 4.5 for Reasoning?
As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in Reasoning at #9 against #40.
Claude Opus 5 or Claude Sonnet 4.5 for Science?
As of Oct 14, 2026, Claude Opus 5 leads Claude Sonnet 4.5 in Science at #12 against #82.