Claude Opus 5 vs Claude Opus 5.5
As of Oct 15, 2026, Claude Opus 5 leads Claude Opus 5.5 in 1 of 10 shared categories: Science.
Claude Opus 5
Close. Near-SOTA in Factuality, rank #4.
Claude Opus 5.5
Yes. SOTA in Reasoning (tied), Coding (tied), Coding › Agentic (tied), Coding › Web dev, Long context (tied), and Factuality (tied).
| Category | Claude Opus 5 | Claude Opus 5.5 |
|---|---|---|
| General LLM | #11 · Was SOTA · General LLM Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 | #2 · Near-SOTA · General LLM Margin 1.0638297872340416 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #9 · Was SOTA · Reasoning Margin 5.319148936170208 LMArena leaderboard dataset · Oct 13, 2026 | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #12 · #12 in Science Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 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 | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #9 · Was SOTA · Long context Margin 4.7872340425531945 LMArena leaderboard dataset · Oct 13, 2026 | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #12 · #12 in Vision Margin 36.8421052631579 Epoch AI benchmarking hub · Jul 24, 2026 | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 |
| Factuality | #4 · Near-SOTA · Factuality Margin 2.9069767441860535 LMArena leaderboard dataset · Oct 13, 2026 | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 |
Claude Opus 5: $10 per 1M blended tokens.
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
Claude Opus 5: closed weights.
Claude Opus 5.5: closed weights.
General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in General LLM at #2 against #11.
Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Reasoning at #1 against #9.
Science: As of Oct 15, 2026, Claude Opus 5 leads Claude Opus 5.5 in Science at #12 against #31.
Coding: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Coding at #1 against #4.
Coding › Agentic: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Coding › Agentic at #1 against #4.
Coding › Web dev: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Coding › Web dev at #1 against #6.
Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Long context at #1 against #9.
Vision: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Vision at #4 against #12.
Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Factuality at #1 against #4.
Abstraction (ARC): As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Abstraction (ARC) at #1 against #3.
Claude Opus 5 · Claude Opus 5.5
Claude Opus 5 or Claude Opus 5.5?
As of Oct 15, 2026, Claude Opus 5 leads Claude Opus 5.5 in 1 of 10 shared categories: Science.
Claude Opus 5 or Claude Opus 5.5 for General LLM?
As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in General LLM at #2 against #11.
Claude Opus 5 or Claude Opus 5.5 for Reasoning?
As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 5 in Reasoning at #1 against #9.
Claude Opus 5 or Claude Opus 5.5 for Science?
As of Oct 15, 2026, Claude Opus 5 leads Claude Opus 5.5 in Science at #12 against #31.