Claude Opus 4.8 vs Claude Sonnet 5.5
As of Oct 14, 2026, Claude Opus 4.8 leads Claude Sonnet 5.5 in 3 of 9 shared categories: General LLM, Reasoning, and Long context.
Claude Opus 4.8
It used to be. Was SOTA in Coding › Web dev.
Claude Sonnet 5.5
Yes. SOTA in co-SOTA in Coding, co-SOTA in Coding › Agentic and co-SOTA in Vision.
| Category | Claude Opus 4.8 | Claude Sonnet 5.5 |
|---|---|---|
| General LLM | #20 · #20 in General LLM Margin 13.605442176870753 LMArena leaderboard dataset · Oct 13, 2026 | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #10 · #10 in Reasoning Margin 7.534246575342465 LMArena leaderboard dataset · Oct 13, 2026 | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 |
| Science | #27 · #27 in Science Margin — Epoch AI benchmarking hub · May 28, 2026 | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 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 | #33 · Was SOTA · Coding › Web dev Margin 29.90654205607477 LMArena leaderboard dataset · Oct 13, 2026 | #3 · Near-SOTA · Coding › Web dev Margin 1.8691588785046775 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #10 · Was SOTA · Long context Margin 6.802721088435391 LMArena leaderboard dataset · Oct 13, 2026 | #11 · #11 in Long context Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #13 · #13 in Vision Margin 36.842105263157904 Epoch AI benchmarking hub · May 28, 2026 | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 |
| Factuality | #21 · #21 in Factuality Margin 16.417910447761187 LMArena leaderboard dataset · Oct 13, 2026 | #16 · #16 in Factuality Margin 12.68656716417911 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #12 · #12 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 28, 2026 | — |
Claude Opus 4.8: $10 per 1M blended tokens.
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
Claude Opus 4.8: closed weights.
Claude Sonnet 5.5: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 4.8 leads Claude Sonnet 5.5 in General LLM at #20 against #27.
Reasoning: As of Oct 14, 2026, Claude Opus 4.8 leads Claude Sonnet 5.5 in Reasoning at #10 against #18.
Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4.8 in Science at #3 against #27.
Coding: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4.8 in Coding at #1 against #12.
Coding › Agentic: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4.8 in Coding › Agentic at #1 against #12.
Coding › Web dev: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4.8 in Coding › Web dev at #3 against #33.
Long context: As of Oct 14, 2026, Claude Opus 4.8 leads Claude Sonnet 5.5 in Long context at #10 against #11.
Vision: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4.8 in Vision at #1 against #13.
Factuality: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4.8 in Factuality at #16 against #21.
Claude Opus 4.8 · Claude Sonnet 5.5
Claude Opus 4.8 or Claude Sonnet 5.5?
As of Oct 14, 2026, Claude Opus 4.8 leads Claude Sonnet 5.5 in 3 of 9 shared categories: General LLM, Reasoning, and Long context.
Claude Opus 4.8 or Claude Sonnet 5.5 for General LLM?
As of Oct 14, 2026, Claude Opus 4.8 leads Claude Sonnet 5.5 in General LLM at #20 against #27.
Claude Opus 4.8 or Claude Sonnet 5.5 for Reasoning?
As of Oct 14, 2026, Claude Opus 4.8 leads Claude Sonnet 5.5 in Reasoning at #10 against #18.
Claude Opus 4.8 or Claude Sonnet 5.5 for Science?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Opus 4.8 in Science at #3 against #27.