Claude Opus 4.6 vs GPT-5.5 Instant
As of Oct 14, 2026, Claude Opus 4.6 leads GPT-5.5 Instant in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Factuality.
Claude Opus 4.6
Close. Near-SOTA in Reasoning, rank #2.
GPT-5.5 Instant
#31 Best current rank: #31 in General LLM, as of Oct 14, 2026.
| Category | Claude Opus 4.6 | GPT-5.5 Instant |
|---|---|---|
| General LLM | #4 · Near-SOTA · General LLM Margin 2.7210884353741562 LMArena leaderboard dataset · Oct 13, 2026 | #31 · #31 in General LLM Margin 21.088435374149654 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #2 · Near-SOTA · Reasoning Margin 2.0547945205479436 LMArena leaderboard dataset · Oct 13, 2026 | #33 · #33 in Reasoning Margin 23.28767123287672 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 | #65 · #65 in Science Margin — Epoch AI benchmarking hub · May 5, 2026 |
| Coding | #— · Not enough data Margin — Epoch AI benchmarking hub · Feb 5, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | #35 · Was SOTA · Coding › Web dev Margin 31.775700934579433 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #2 · Near-SOTA · Long context Margin 0.6802721088435391 LMArena leaderboard dataset · Oct 13, 2026 | #39 · #39 in Long context Margin 26.530612244897952 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #3 · Near-SOTA · Factuality Margin 2.9850746268656536 LMArena leaderboard dataset · Oct 13, 2026 | #64 · #64 in Factuality Margin 48.507462686567166 LMArena leaderboard dataset · Oct 13, 2026 |
Claude Opus 4.6: $10 per 1M blended tokens.
GPT-5.5 Instant: price per 1M tokens is unset in the catalog.
Claude Opus 4.6: closed weights.
GPT-5.5 Instant: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 4.6 leads GPT-5.5 Instant in General LLM at #4 against #31.
Reasoning: As of Oct 14, 2026, Claude Opus 4.6 leads GPT-5.5 Instant in Reasoning at #2 against #33.
Science: As of Oct 14, 2026, Claude Opus 4.6 leads GPT-5.5 Instant in Science at #32 against #65.
Long context: As of Oct 14, 2026, Claude Opus 4.6 leads GPT-5.5 Instant in Long context at #2 against #39.
Factuality: As of Oct 14, 2026, Claude Opus 4.6 leads GPT-5.5 Instant in Factuality at #3 against #64.
Claude Opus 4.6 · GPT-5.5 Instant
Claude Opus 4.6 or GPT-5.5 Instant?
As of Oct 14, 2026, Claude Opus 4.6 leads GPT-5.5 Instant in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Factuality.
Claude Opus 4.6 or GPT-5.5 Instant for General LLM?
As of Oct 14, 2026, Claude Opus 4.6 leads GPT-5.5 Instant in General LLM at #4 against #31.
Claude Opus 4.6 or GPT-5.5 Instant for Reasoning?
As of Oct 14, 2026, Claude Opus 4.6 leads GPT-5.5 Instant in Reasoning at #2 against #33.
Claude Opus 4.6 or GPT-5.5 Instant for Science?
As of Oct 14, 2026, Claude Opus 4.6 leads GPT-5.5 Instant in Science at #32 against #65.