GPT-5.1 vs GPT-5.5
As of Oct 14, 2026, GPT-5.1 leads GPT-5.5 in 0 of 7 shared categories.
GPT-5.1
#18 Best current rank: #18 in Math, as of Oct 14, 2026.
GPT-5.5
It used to be. Was SOTA in General LLM.
| Category | GPT-5.1 | GPT-5.5 |
|---|---|---|
| General LLM | #47 · #47 in General LLM Margin 31.972789115646265 LMArena leaderboard dataset · Oct 13, 2026 | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #48 · #48 in Reasoning Margin 33.56164383561644 LMArena leaderboard dataset · Oct 13, 2026 | #25 · #25 in Reasoning Margin 17.808219178082197 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #18 · #18 in Math Margin 37.77777777777778 Epoch AI benchmarking hub · Nov 13, 2025 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #48 · #48 in Science Margin — Epoch AI benchmarking hub · Nov 13, 2025 | #30 · #30 in Science Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
| Coding | #— · Not enough data Margin — Epoch AI benchmarking hub · Nov 13, 2025 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | #75 · #75 in Coding › Web dev Margin 69.1588785046729 LMArena leaderboard dataset · Oct 13, 2026 | #44 · #44 in Coding › Web dev Margin 40.18691588785047 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #54 · #54 in Long context Margin 36.73469387755103 LMArena leaderboard dataset · Oct 13, 2026 | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 |
| Factuality | #37 · #37 in Factuality Margin 28.358208955223887 LMArena leaderboard dataset · Oct 13, 2026 | #5 · Was SOTA · Factuality Margin 4.477611940298502 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #31 · #31 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Nov 13, 2025 | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
GPT-5.1: $3.4375000000000004 per 1M blended tokens.
GPT-5.5: $11.25 per 1M blended tokens.
GPT-5.1: closed weights.
GPT-5.5: closed weights.
General LLM: As of Oct 14, 2026, GPT-5.5 leads GPT-5.1 in General LLM at #21 against #47.
Reasoning: As of Oct 14, 2026, GPT-5.5 leads GPT-5.1 in Reasoning at #25 against #48.
Science: As of Oct 14, 2026, GPT-5.5 leads GPT-5.1 in Science at #30 against #48.
Coding › Web dev: As of Oct 14, 2026, GPT-5.5 leads GPT-5.1 in Coding › Web dev at #44 against #75.
Long context: As of Oct 14, 2026, GPT-5.5 leads GPT-5.1 in Long context at #23 against #54.
Factuality: As of Oct 14, 2026, GPT-5.5 leads GPT-5.1 in Factuality at #5 against #37.
Abstraction (ARC): As of Oct 14, 2026, GPT-5.5 leads GPT-5.1 in Abstraction (ARC) at #7 against #31.
GPT-5.1 or GPT-5.5?
As of Oct 14, 2026, GPT-5.1 leads GPT-5.5 in 0 of 7 shared categories.
GPT-5.1 or GPT-5.5 for General LLM?
As of Oct 14, 2026, GPT-5.5 leads GPT-5.1 in General LLM at #21 against #47.
GPT-5.1 or GPT-5.5 for Reasoning?
As of Oct 14, 2026, GPT-5.5 leads GPT-5.1 in Reasoning at #25 against #48.
GPT-5.1 or GPT-5.5 for Science?
As of Oct 14, 2026, GPT-5.5 leads GPT-5.1 in Science at #30 against #48.