Claude Opus 5 vs GPT-5.5 Instant
As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 Instant in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Factuality.
Claude Opus 5
Close. Near-SOTA in Factuality, rank #4.
GPT-5.5 Instant
#31 Best current rank: #31 in General LLM, as of Oct 14, 2026.
| Category | Claude Opus 5 | GPT-5.5 Instant |
|---|---|---|
| General LLM | #11 · Was SOTA · General LLM Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #31 · #31 in General LLM Margin 21.088435374149654 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #9 · Was SOTA · Reasoning Margin 6.849315068493155 LMArena leaderboard dataset · Oct 13, 2026 | #33 · #33 in Reasoning Margin 23.28767123287672 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 | #65 · #65 in Science Margin — Epoch AI benchmarking hub · May 5, 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 | — |
| Long context | #9 · Was SOTA · Long context Margin 6.122448979591837 LMArena leaderboard dataset · Oct 13, 2026 | #39 · #39 in Long context Margin 26.530612244897952 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #12 · #12 in Vision Margin 36.8421052631579 Epoch AI benchmarking hub · Jul 24, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #4 · Near-SOTA · Factuality Margin 3.731343283582092 LMArena leaderboard dataset · Oct 13, 2026 | #64 · #64 in Factuality Margin 48.507462686567166 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 | — |
Claude Opus 5: $10 per 1M blended tokens.
GPT-5.5 Instant: price per 1M tokens is unset in the catalog.
Claude Opus 5: closed weights.
GPT-5.5 Instant: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 Instant in General LLM at #11 against #31.
Reasoning: As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 Instant in Reasoning at #9 against #33.
Science: As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 Instant in Science at #12 against #65.
Long context: As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 Instant in Long context at #9 against #39.
Factuality: As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 Instant in Factuality at #4 against #64.
Claude Opus 5 · GPT-5.5 Instant
Claude Opus 5 or GPT-5.5 Instant?
As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 Instant in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Factuality.
Claude Opus 5 or GPT-5.5 Instant for General LLM?
As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 Instant in General LLM at #11 against #31.
Claude Opus 5 or GPT-5.5 Instant for Reasoning?
As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 Instant in Reasoning at #9 against #33.
Claude Opus 5 or GPT-5.5 Instant for Science?
As of Oct 14, 2026, Claude Opus 5 leads GPT-5.5 Instant in Science at #12 against #65.