Claude Sonnet 5.5 vs GPT-5.5
As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 in 5 of 7 shared categories: Reasoning, Science, Coding › Web dev, Long context, and Vision.
Claude Sonnet 5.5
Yes. SOTA in co-SOTA in Coding, co-SOTA in Coding › Agentic and co-SOTA in Vision.
GPT-5.5
It used to be. Was SOTA in General LLM.
| Category | Claude Sonnet 5.5 | GPT-5.5 |
|---|---|---|
| General LLM | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 | #25 · #25 in Reasoning Margin 17.808219178082197 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 | #30 · #30 in Science Margin — Epoch AI benchmarking hub · Apr 23, 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 | #44 · #44 in Coding › Web dev Margin 40.18691588785047 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #11 · #11 in Long context Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 |
| Factuality | #16 · #16 in Factuality Margin 12.68656716417911 LMArena leaderboard dataset · Oct 13, 2026 | #5 · Was SOTA · Factuality Margin 4.477611940298502 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | — | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
GPT-5.5: $11.25 per 1M blended tokens.
Claude Sonnet 5.5: closed weights.
GPT-5.5: closed weights.
General LLM: As of Oct 14, 2026, GPT-5.5 leads Claude Sonnet 5.5 in General LLM at #21 against #27.
Reasoning: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 in Reasoning at #18 against #25.
Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 in Science at #3 against #30.
Coding › Web dev: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 in Coding › Web dev at #3 against #44.
Long context: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 in Long context at #11 against #23.
Vision: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 in Vision at #1 against #10.
Factuality: As of Oct 14, 2026, GPT-5.5 leads Claude Sonnet 5.5 in Factuality at #5 against #16.
Claude Sonnet 5.5 or GPT-5.5?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 in 5 of 7 shared categories: Reasoning, Science, Coding › Web dev, Long context, and Vision.
Claude Sonnet 5.5 or GPT-5.5 for General LLM?
As of Oct 14, 2026, GPT-5.5 leads Claude Sonnet 5.5 in General LLM at #21 against #27.
Claude Sonnet 5.5 or GPT-5.5 for Reasoning?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 in Reasoning at #18 against #25.
Claude Sonnet 5.5 or GPT-5.5 for Science?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.5 in Science at #3 against #30.