Compare · 2026-10-15
GPT-4O vs GPT-5.5
As of Oct 15, 2026, GPT-4O leads GPT-5.5 in 0 of 2 shared categories.
| Category | GPT-4O | GPT-5.5 |
|---|---|---|
| General LLM | #— · Was SOTA · General LLM Margin — LMArena leaderboard dataset · Feb 21, 2025 | #22 · Was SOTA · General LLM Margin 11.702127659574472 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #— · Not enough data Margin — LMArena leaderboard dataset · Feb 6, 2025 | #26 · #26 in Reasoning Margin 14.36170212765957 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #45 · #45 in Math Margin 100 Epoch AI benchmarking hub · Nov 20, 2024 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #131 · #131 in Science Margin — Epoch AI benchmarking hub · Nov 20, 2024 | #30 · #30 in Science Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
| Coding | #— · Not enough data Margin — LMArena leaderboard dataset · Feb 17, 2025 | #— · 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 | #— · Not enough data Margin — LMArena leaderboard dataset · Jan 22, 2025 | #26 · Was SOTA · Long context Margin 13.829787234042556 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 | #— · Not enough data Margin — Epoch AI benchmarking hub · Aug 6, 2024 | #5 · Near-SOTA · Factuality Margin 3.4883720930232442 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #87 · #87 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Nov 20, 2024 | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
Price per 1M tokens
GPT-4O: $4.375000000000001 per 1M blended tokens.
GPT-5.5: $11.25 per 1M blended tokens.
Open weights
GPT-4O: closed weights.
GPT-5.5: closed weights.
Which to pick
Science: As of Oct 15, 2026, GPT-5.5 leads GPT-4O in Science at #30 against #131.
Abstraction (ARC): As of Oct 15, 2026, GPT-5.5 leads GPT-4O in Abstraction (ARC) at #7 against #87.
GPT-4O or GPT-5.5?
As of Oct 15, 2026, GPT-4O leads GPT-5.5 in 0 of 2 shared categories.
GPT-4O or GPT-5.5 for Science?
As of Oct 15, 2026, GPT-5.5 leads GPT-4O in Science at #30 against #131.
GPT-4O or GPT-5.5 for Abstraction (ARC)?
As of Oct 15, 2026, GPT-5.5 leads GPT-4O in Abstraction (ARC) at #7 against #87.