Claude Opus 4.6 vs Claude Opus 5.5
As of Oct 14, 2026, Claude Opus 4.6 leads Claude Opus 5.5 in 0 of 6 shared categories.
Claude Opus 4.6
Close. Near-SOTA in Reasoning, rank #2.
Claude Opus 5.5
Yes. SOTA in co-SOTA in Reasoning, co-SOTA in Coding, co-SOTA in Coding › Agentic, Coding › Web dev, co-SOTA in Long context and co-SOTA in Factuality.
| Category | Claude Opus 4.6 | Claude Opus 5.5 |
|---|---|---|
| General LLM | #4 · Near-SOTA · General LLM Margin 2.7210884353741562 LMArena leaderboard dataset · Oct 13, 2026 | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #2 · Near-SOTA · Reasoning Margin 2.0547945205479436 LMArena leaderboard dataset · Oct 13, 2026 | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #11 · #11 in Math Margin 22.22222222222223 Epoch AI benchmarking hub · Feb 5, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #32 · #32 in Science Margin — Epoch AI benchmarking hub · Feb 5, 2026 | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 |
| Coding | #— · Not enough data Margin — Epoch AI benchmarking hub · Feb 5, 2026 | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | — | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | #35 · Was SOTA · Coding › Web dev Margin 31.775700934579433 LMArena leaderboard dataset · Oct 13, 2026 | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #2 · Near-SOTA · Long context Margin 0.6802721088435391 LMArena leaderboard dataset · Oct 13, 2026 | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 |
| Factuality | #3 · Near-SOTA · Factuality Margin 2.9850746268656536 LMArena leaderboard dataset · Oct 13, 2026 | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | — | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 |
Claude Opus 4.6: $10 per 1M blended tokens.
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
Claude Opus 4.6: closed weights.
Claude Opus 5.5: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4.6 in General LLM at #2 against #4.
Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4.6 in Reasoning at #1 against #2.
Science: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4.6 in Science at #31 against #32.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4.6 in Coding › Web dev at #1 against #35.
Long context: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4.6 in Long context at #1 against #2.
Factuality: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4.6 in Factuality at #1 against #3.
Claude Opus 4.6 · Claude Opus 5.5
Claude Opus 4.6 or Claude Opus 5.5?
As of Oct 14, 2026, Claude Opus 4.6 leads Claude Opus 5.5 in 0 of 6 shared categories.
Claude Opus 4.6 or Claude Opus 5.5 for General LLM?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4.6 in General LLM at #2 against #4.
Claude Opus 4.6 or Claude Opus 5.5 for Reasoning?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4.6 in Reasoning at #1 against #2.
Claude Opus 4.6 or Claude Opus 5.5 for Science?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Opus 4.6 in Science at #31 against #32.