Claude Sonnet 4.5 vs GPT-5.5
As of Oct 14, 2026, Claude Sonnet 4.5 leads GPT-5.5 in 0 of 7 shared categories.
Claude Sonnet 4.5
It used to be. Was SOTA in General LLM.
GPT-5.5
It used to be. Was SOTA in General LLM.
| Category | Claude Sonnet 4.5 | GPT-5.5 |
|---|---|---|
| General LLM | #49 · Was SOTA · General LLM Margin 33.33333333333333 LMArena leaderboard dataset · Oct 13, 2026 | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #40 · Was SOTA · Reasoning Margin 28.082191780821915 LMArena leaderboard dataset · Oct 13, 2026 | #25 · #25 in Reasoning Margin 17.808219178082197 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #25 · #25 in Math Margin 53.333333333333336 Epoch AI benchmarking hub · Sep 29, 2025 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #82 · #82 in Science Margin — Epoch AI benchmarking hub · Sep 29, 2025 | #30 · #30 in Science Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
| Coding | #— · Not enough data Margin — Epoch AI benchmarking hub · Sep 29, 2025 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | #78 · Was SOTA · Coding › Web dev Margin 71.96261682242991 LMArena leaderboard dataset · Oct 13, 2026 | #44 · #44 in Coding › Web dev Margin 40.18691588785047 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #29 · Was SOTA · Long context Margin 19.72789115646259 LMArena leaderboard dataset · Oct 13, 2026 | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | — | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 |
| Factuality | #50 · #50 in Factuality Margin 38.059701492537314 LMArena leaderboard dataset · Oct 13, 2026 | #5 · Was SOTA · Factuality Margin 4.477611940298502 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #66 · #66 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 29, 2025 | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
Claude Sonnet 4.5: $6 per 1M blended tokens.
GPT-5.5: $11.25 per 1M blended tokens.
Claude Sonnet 4.5: closed weights.
GPT-5.5: closed weights.
General LLM: As of Oct 14, 2026, GPT-5.5 leads Claude Sonnet 4.5 in General LLM at #21 against #49.
Reasoning: As of Oct 14, 2026, GPT-5.5 leads Claude Sonnet 4.5 in Reasoning at #25 against #40.
Science: As of Oct 14, 2026, GPT-5.5 leads Claude Sonnet 4.5 in Science at #30 against #82.
Coding › Web dev: As of Oct 14, 2026, GPT-5.5 leads Claude Sonnet 4.5 in Coding › Web dev at #44 against #78.
Long context: As of Oct 14, 2026, GPT-5.5 leads Claude Sonnet 4.5 in Long context at #23 against #29.
Factuality: As of Oct 14, 2026, GPT-5.5 leads Claude Sonnet 4.5 in Factuality at #5 against #50.
Abstraction (ARC): As of Oct 14, 2026, GPT-5.5 leads Claude Sonnet 4.5 in Abstraction (ARC) at #7 against #66.
Claude Sonnet 4.5 or GPT-5.5?
As of Oct 14, 2026, Claude Sonnet 4.5 leads GPT-5.5 in 0 of 7 shared categories.
Claude Sonnet 4.5 or GPT-5.5 for General LLM?
As of Oct 14, 2026, GPT-5.5 leads Claude Sonnet 4.5 in General LLM at #21 against #49.
Claude Sonnet 4.5 or GPT-5.5 for Reasoning?
As of Oct 14, 2026, GPT-5.5 leads Claude Sonnet 4.5 in Reasoning at #25 against #40.
Claude Sonnet 4.5 or GPT-5.5 for Science?
As of Oct 14, 2026, GPT-5.5 leads Claude Sonnet 4.5 in Science at #30 against #82.