Claude Sonnet 5.5 vs GPT-5.5 Instant
As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 Instant in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Factuality.
Claude Sonnet 5.5
Yes. SOTA in co-SOTA in Coding, co-SOTA in Coding › Agentic and co-SOTA in Vision.
GPT-5.5 Instant
#31 Best current rank: #31 in General LLM, as of Oct 14, 2026.
| Category | Claude Sonnet 5.5 | GPT-5.5 Instant |
|---|---|---|
| General LLM | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 | #31 · #31 in General LLM Margin 21.088435374149654 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 | #33 · #33 in Reasoning Margin 23.28767123287672 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 2026 | #65 · #65 in Science Margin — Epoch AI benchmarking hub · May 5, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #3 · Near-SOTA · Coding › Web dev Margin 1.8691588785046775 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #11 · #11 in Long context Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #39 · #39 in Long context Margin 26.530612244897952 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #16 · #16 in Factuality Margin 12.68656716417911 LMArena leaderboard dataset · Oct 13, 2026 | #64 · #64 in Factuality Margin 48.507462686567166 LMArena leaderboard dataset · Oct 13, 2026 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
GPT-5.5 Instant: price per 1M tokens is unset in the catalog.
Claude Sonnet 5.5: closed weights.
GPT-5.5 Instant: closed weights.
General LLM: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 Instant in General LLM at #27 against #31.
Reasoning: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 Instant in Reasoning at #18 against #33.
Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 Instant in Science at #3 against #65.
Long context: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 Instant in Long context at #11 against #39.
Factuality: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 Instant in Factuality at #16 against #64.
Claude Sonnet 5.5 · GPT-5.5 Instant
Claude Sonnet 5.5 or GPT-5.5 Instant?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 Instant in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Factuality.
Claude Sonnet 5.5 or GPT-5.5 Instant for General LLM?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 Instant in General LLM at #27 against #31.
Claude Sonnet 5.5 or GPT-5.5 Instant for Reasoning?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 Instant in Reasoning at #18 against #33.
Claude Sonnet 5.5 or GPT-5.5 Instant for Science?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 Instant in Science at #3 against #65.