Claude Opus 4.8 vs GPT-5.5
As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 in 5 of 8 shared categories: General LLM, Reasoning, Science, Coding › Web dev, and Long context.
Claude Opus 4.8
It used to be. Was SOTA in Coding › Web dev.
GPT-5.5
Close. Near-SOTA in Factuality, rank #5.
| Category | Claude Opus 4.8 | GPT-5.5 |
|---|---|---|
| General LLM | #21 · #21 in General LLM Margin 11.170212765957444 LMArena leaderboard dataset · Oct 13, 2026 | #22 · Was SOTA · General LLM Margin 11.702127659574472 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #10 · #10 in Reasoning Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 | #26 · #26 in Reasoning Margin 14.36170212765957 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 | #30 · #30 in Science Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
| Coding | #12 · #12 in Coding Margin 59.09090909090909 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #12 · #12 in Coding › Agentic Margin 59.09090909090909 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 | #48 · #48 in Coding › Web dev Margin 37.6 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #10 · Was SOTA · Long context Margin 5.319148936170208 LMArena leaderboard dataset · Oct 13, 2026 | #26 · Was SOTA · Long context Margin 13.829787234042556 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #13 · #13 in Vision Margin 36.842105263157904 Epoch AI benchmarking hub · May 28, 2026 | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 |
| Factuality | #24 · #24 in Factuality Margin 14.534883720930239 LMArena leaderboard dataset · Oct 13, 2026 | #5 · Near-SOTA · Factuality Margin 3.4883720930232442 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #12 · #12 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 28, 2026 | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
Claude Opus 4.8: $10 per 1M blended tokens.
GPT-5.5: $11.25 per 1M blended tokens.
Claude Opus 4.8: closed weights.
GPT-5.5: closed weights.
General LLM: As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 in General LLM at #21 against #22.
Reasoning: As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 in Reasoning at #10 against #26.
Science: As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 in Science at #27 against #30.
Coding › Web dev: As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 in Coding › Web dev at #35 against #48.
Long context: As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 in Long context at #10 against #26.
Vision: As of Oct 15, 2026, GPT-5.5 leads Claude Opus 4.8 in Vision at #10 against #13.
Factuality: As of Oct 15, 2026, GPT-5.5 leads Claude Opus 4.8 in Factuality at #5 against #24.
Abstraction (ARC): As of Oct 15, 2026, GPT-5.5 leads Claude Opus 4.8 in Abstraction (ARC) at #7 against #12.
Claude Opus 4.8 or GPT-5.5?
As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 in 5 of 8 shared categories: General LLM, Reasoning, Science, Coding › Web dev, and Long context.
Claude Opus 4.8 or GPT-5.5 for General LLM?
As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 in General LLM at #21 against #22.
Claude Opus 4.8 or GPT-5.5 for Reasoning?
As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 in Reasoning at #10 against #26.
Claude Opus 4.8 or GPT-5.5 for Science?
As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 in Science at #27 against #30.