Claude Opus 4.8 vs GPT-5.5 Instant
As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 Instant in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Factuality.
Claude Opus 4.8
It used to be. Was SOTA in Coding › Web dev.
GPT-5.5 Instant
#36 Best current rank: #36 in General LLM, as of Oct 15, 2026.
| Category | Claude Opus 4.8 | GPT-5.5 Instant |
|---|---|---|
| General LLM | #21 · #21 in General LLM Margin 11.170212765957444 LMArena leaderboard dataset · Oct 13, 2026 | #36 · #36 in General LLM Margin 19.148936170212764 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #10 · #10 in Reasoning Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 | #38 · #38 in Reasoning Margin 20.744680851063833 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 | #65 · #65 in Science Margin — Epoch AI benchmarking hub · May 5, 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 | — |
| Long context | #10 · Was SOTA · Long context Margin 5.319148936170208 LMArena leaderboard dataset · Oct 13, 2026 | #46 · #46 in Long context Margin 24.468085106382972 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #13 · #13 in Vision Margin 36.842105263157904 Epoch AI benchmarking hub · May 28, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #24 · #24 in Factuality Margin 14.534883720930239 LMArena leaderboard dataset · Oct 13, 2026 | #78 · #78 in Factuality Margin 45.93023255813954 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.
GPT-5.5 Instant: price per 1M tokens is unset in the catalog.
Claude Opus 4.8: closed weights.
GPT-5.5 Instant: closed weights.
General LLM: As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 Instant in General LLM at #21 against #36.
Reasoning: As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 Instant in Reasoning at #10 against #38.
Science: As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 Instant in Science at #27 against #65.
Long context: As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 Instant in Long context at #10 against #46.
Factuality: As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 Instant in Factuality at #24 against #78.
Claude Opus 4.8 · GPT-5.5 Instant
Claude Opus 4.8 or GPT-5.5 Instant?
As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 Instant in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Factuality.
Claude Opus 4.8 or GPT-5.5 Instant for General LLM?
As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 Instant in General LLM at #21 against #36.
Claude Opus 4.8 or GPT-5.5 Instant for Reasoning?
As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 Instant in Reasoning at #10 against #38.
Claude Opus 4.8 or GPT-5.5 Instant for Science?
As of Oct 15, 2026, Claude Opus 4.8 leads GPT-5.5 Instant in Science at #27 against #65.