Claude Sonnet 4.5 20250929 vs GPT-5.5
As of Oct 15, 2026, Claude Sonnet 4.5 20250929 leads GPT-5.5 in 0 of 2 shared categories.
Claude Sonnet 4.5 20250929
#36 Best recorded rank: #36 in Abstraction (ARC), as of Oct 15, 2026.
GPT-5.5
Close. Near-SOTA in Factuality, rank #5.
| Category | Claude Sonnet 4.5 20250929 | GPT-5.5 |
|---|---|---|
| General LLM | — | #22 · Was SOTA · General LLM Margin 11.702127659574472 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #— · Not enough data Margin — Epoch AI benchmarking hub · Sep 29, 2025 | #26 · #26 in Reasoning Margin 14.36170212765957 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | — | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #66 · #66 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 — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | — | #48 · #48 in Coding › Web dev Margin 37.6 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | — | #26 · Was SOTA · Long context Margin 13.829787234042556 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | — | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 |
| Factuality | #— · Not enough data Margin — Epoch AI benchmarking hub · Sep 29, 2025 | #5 · Near-SOTA · Factuality Margin 3.4883720930232442 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #36 · #36 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 20250929: price per 1M tokens is unset in the catalog.
GPT-5.5: $11.25 per 1M blended tokens.
Claude Sonnet 4.5 20250929: closed weights.
GPT-5.5: closed weights.
Science: As of Oct 15, 2026, GPT-5.5 leads Claude Sonnet 4.5 20250929 in Science at #30 against #66.
Abstraction (ARC): As of Oct 15, 2026, GPT-5.5 leads Claude Sonnet 4.5 20250929 in Abstraction (ARC) at #7 against #36.
Claude Sonnet 4.5 20250929 · GPT-5.5
Claude Sonnet 4.5 20250929 or GPT-5.5?
As of Oct 15, 2026, Claude Sonnet 4.5 20250929 leads GPT-5.5 in 0 of 2 shared categories.
Claude Sonnet 4.5 20250929 or GPT-5.5 for Science?
As of Oct 15, 2026, GPT-5.5 leads Claude Sonnet 4.5 20250929 in Science at #30 against #66.
Claude Sonnet 4.5 20250929 or GPT-5.5 for Abstraction (ARC)?
As of Oct 15, 2026, GPT-5.5 leads Claude Sonnet 4.5 20250929 in Abstraction (ARC) at #7 against #36.