Claude Opus 4.5 vs Claude Opus 5
As of Oct 14, 2026, Claude Opus 4.5 leads Claude Opus 5 in 0 of 7 shared categories.
Claude Opus 4.5
It used to be. Was SOTA in Reasoning.
Claude Opus 5
Close. Near-SOTA in Factuality, rank #4.
| Category | Claude Opus 4.5 | Claude Opus 5 |
|---|---|---|
| General LLM | #33 · #33 in General LLM Margin 22.448979591836732 LMArena leaderboard dataset · Oct 13, 2026 | #11 · Was SOTA · General LLM Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #28 · Was SOTA · Reasoning Margin 19.86301369863014 LMArena leaderboard dataset · Oct 13, 2026 | #9 · Was SOTA · Reasoning Margin 6.849315068493155 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #16 · #16 in Math Margin 33.33333333333333 Epoch AI benchmarking hub · Nov 24, 2025 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #68 · #68 in Science Margin — Epoch AI benchmarking hub · Nov 24, 2025 | #12 · #12 in Science Margin — Epoch AI benchmarking hub · Jul 24, 2026 |
| Coding | #— · Not enough data Margin — Epoch AI benchmarking hub · Nov 24, 2025 | #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 | #53 · Was SOTA · Coding › Web dev Margin 48.598130841121495 LMArena leaderboard dataset · Oct 13, 2026 | #6 · Was SOTA · Coding › Web dev Margin 4.672897196261687 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #19 · Was SOTA · Long context Margin 12.925170068027214 LMArena leaderboard dataset · Oct 13, 2026 | #9 · Was SOTA · Long context Margin 6.122448979591837 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | — | #12 · #12 in Vision Margin 36.8421052631579 Epoch AI benchmarking hub · Jul 24, 2026 |
| Factuality | #36 · #36 in Factuality Margin 27.611940298507463 LMArena leaderboard dataset · Oct 13, 2026 | #4 · Near-SOTA · Factuality Margin 3.731343283582092 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #49 · #49 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Nov 24, 2025 | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 |
Claude Opus 4.5: $10 per 1M blended tokens.
Claude Opus 5: $10 per 1M blended tokens.
Claude Opus 4.5: closed weights.
Claude Opus 5: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 5 leads Claude Opus 4.5 in General LLM at #11 against #33.
Reasoning: As of Oct 14, 2026, Claude Opus 5 leads Claude Opus 4.5 in Reasoning at #9 against #28.
Science: As of Oct 14, 2026, Claude Opus 5 leads Claude Opus 4.5 in Science at #12 against #68.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 5 leads Claude Opus 4.5 in Coding › Web dev at #6 against #53.
Long context: As of Oct 14, 2026, Claude Opus 5 leads Claude Opus 4.5 in Long context at #9 against #19.
Factuality: As of Oct 14, 2026, Claude Opus 5 leads Claude Opus 4.5 in Factuality at #4 against #36.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5 leads Claude Opus 4.5 in Abstraction (ARC) at #3 against #49.
Claude Opus 4.5 · Claude Opus 5
Claude Opus 4.5 or Claude Opus 5?
As of Oct 14, 2026, Claude Opus 4.5 leads Claude Opus 5 in 0 of 7 shared categories.
Claude Opus 4.5 or Claude Opus 5 for General LLM?
As of Oct 14, 2026, Claude Opus 5 leads Claude Opus 4.5 in General LLM at #11 against #33.
Claude Opus 4.5 or Claude Opus 5 for Reasoning?
As of Oct 14, 2026, Claude Opus 5 leads Claude Opus 4.5 in Reasoning at #9 against #28.
Claude Opus 4.5 or Claude Opus 5 for Science?
As of Oct 14, 2026, Claude Opus 5 leads Claude Opus 4.5 in Science at #12 against #68.