Claude Opus 4.8 vs Claude Opus 5.5
As of Oct 15, 2026, Claude Opus 4.8 leads Claude Opus 5.5 in 1 of 10 shared categories: Science.
Claude Opus 4.8
It used to be. Was SOTA in Coding › Web dev.
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 4.8 | Claude Opus 5.5 |
|---|---|---|
| General LLM | #21 · #21 in General LLM Margin 11.170212765957444 LMArena leaderboard dataset · Oct 13, 2026 | #2 · Near-SOTA · General LLM Margin 1.0638297872340416 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #10 · #10 in Reasoning Margin 5.851063829787236 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 | #27 · #27 in Science Margin — Epoch AI benchmarking hub · May 28, 2026 | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 |
| Coding | #12 · #12 in Coding Margin 59.09090909090909 Terminal-Bench Harbor Hub · Oct 6, 2026 | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #12 · #12 in Coding › Agentic Margin 59.09090909090909 Terminal-Bench Harbor Hub · Oct 6, 2026 | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | #35 · Was SOTA · Coding › Web dev Margin 27.200000000000003 LMArena leaderboard dataset · Oct 13, 2026 | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #10 · Was SOTA · Long context Margin 5.319148936170208 LMArena leaderboard dataset · Oct 13, 2026 | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #13 · #13 in Vision Margin 36.842105263157904 Epoch AI benchmarking hub · May 28, 2026 | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 |
| Factuality | #24 · #24 in Factuality Margin 14.534883720930239 LMArena leaderboard dataset · Oct 13, 2026 | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #12 · #12 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 28, 2026 | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 |
Claude Opus 4.8: $10 per 1M blended tokens.
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
Claude Opus 4.8: closed weights.
Claude Opus 5.5: closed weights.
General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.8 in General LLM at #2 against #21.
Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.8 in Reasoning at #1 against #10.
Science: As of Oct 15, 2026, Claude Opus 4.8 leads Claude Opus 5.5 in Science at #27 against #31.
Coding: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.8 in Coding at #1 against #12.
Coding › Agentic: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.8 in Coding › Agentic at #1 against #12.
Coding › Web dev: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.8 in Coding › Web dev at #1 against #35.
Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.8 in Long context at #1 against #10.
Vision: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.8 in Vision at #4 against #13.
Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.8 in Factuality at #1 against #24.
Abstraction (ARC): As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.8 in Abstraction (ARC) at #1 against #12.
Claude Opus 4.8 · Claude Opus 5.5
Claude Opus 4.8 or Claude Opus 5.5?
As of Oct 15, 2026, Claude Opus 4.8 leads Claude Opus 5.5 in 1 of 10 shared categories: Science.
Claude Opus 4.8 or Claude Opus 5.5 for General LLM?
As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.8 in General LLM at #2 against #21.
Claude Opus 4.8 or Claude Opus 5.5 for Reasoning?
As of Oct 15, 2026, Claude Opus 5.5 leads Claude Opus 4.8 in Reasoning at #1 against #10.
Claude Opus 4.8 or Claude Opus 5.5 for Science?
As of Oct 15, 2026, Claude Opus 4.8 leads Claude Opus 5.5 in Science at #27 against #31.