Claude Opus 5 vs GPT-5.5
As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 in 7 of 8 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Factuality, and Abstraction (ARC).
Claude Opus 5
Close. Near-SOTA in Factuality, rank #4.
GPT-5.5
It used to be. Was SOTA in General LLM.
| Category | Claude Opus 5 | GPT-5.5 |
|---|---|---|
| General LLM | #11 · Was SOTA · General LLM Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #9 · Was SOTA · Reasoning Margin 6.849315068493155 LMArena leaderboard dataset · Oct 13, 2026 | #25 · #25 in Reasoning Margin 17.808219178082197 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 | #30 · #30 in Science Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
| Coding | #4 · #4 in Coding Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #4 · #4 in Coding › Agentic Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #6 · Was SOTA · Coding › Web dev Margin 4.672897196261687 LMArena leaderboard dataset · Oct 13, 2026 | #44 · #44 in Coding › Web dev Margin 40.18691588785047 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #9 · Was SOTA · Long context Margin 6.122448979591837 LMArena leaderboard dataset · Oct 13, 2026 | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #12 · #12 in Vision Margin 36.8421052631579 Epoch AI benchmarking hub · Jul 24, 2026 | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 |
| Factuality | #4 · Near-SOTA · Factuality Margin 3.731343283582092 LMArena leaderboard dataset · Oct 13, 2026 | #5 · Was SOTA · Factuality Margin 4.477611940298502 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
Claude Opus 5: $10 per 1M blended tokens.
GPT-5.5: $11.25 per 1M blended tokens.
Claude Opus 5: closed weights.
GPT-5.5: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 in General LLM at #11 against #21.
Reasoning: As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 in Reasoning at #9 against #25.
Science: As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 in Science at #12 against #30.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 in Coding › Web dev at #6 against #44.
Long context: As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 in Long context at #9 against #23.
Vision: As of Oct 14, 2026, GPT-5.5 leads Claude Opus 5 in Vision at #10 against #12.
Factuality: As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 in Factuality at #4 against #5.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 in Abstraction (ARC) at #3 against #7.
Claude Opus 5 or GPT-5.5?
As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 in 7 of 8 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Factuality, and Abstraction (ARC).
Claude Opus 5 or GPT-5.5 for General LLM?
As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 in General LLM at #11 against #21.
Claude Opus 5 or GPT-5.5 for Reasoning?
As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 in Reasoning at #9 against #25.
Claude Opus 5 or GPT-5.5 for Science?
As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 in Science at #12 against #30.